Can I Extend My Rental After It Has Started?
Yes, you can often extend a rental car after the rental has started, but the extension must be approved by the rental company before your existing rental agreement expires. An extension is not automatic because the vehicle may already be reserved for another customer after your scheduled return date.
With Blanca Cars, customers who want to keep their rental vehicle longer must request an extension at least 24 hours before the current rental period ends. Blanca Cars will then check whether the vehicle is available for the additional dates. The extension is only valid once it has been approved.
If the same car cannot be extended because another customer has already booked it, Blanca Cars may need to discuss another solution with you, subject to vehicle availability.
Last reviewed: 27 August 2026
Reviewed by: Blanca Cars Operations Team
Applies to: Car hire in Spain, with specific information about extending a Blanca Cars rental on the Costa Blanca
Quick Answer: Can I Keep My Rental Car Longer?
Usually yes, if the rental company approves the extension and the vehicle is available.
You should not simply keep the vehicle beyond the agreed return date.
The correct process is:
- Check when your current rental ends.
- Contact the rental company before the rental expires.
- Tell them how much longer you need the car.
- Wait for confirmation that an extension is possible.
- Agree to the additional rental period and price.
- Complete any required payment or contract update.
- Keep the vehicle until the newly agreed return date.
With Blanca Cars, the current FAQ says an extension request should be made 24 hours before the end of the rental period.
The Blanca Cars Terms & Conditions also state that the renter must notify Blanca Cars before the contract expires and receive prior authorisation, with approval depending on vehicle availability.
The important rule is:
Wanting to keep the car longer does not itself extend the rental agreement. Blanca Cars must approve the extension.
Why Do I Need Permission to Extend a Rental Car?
When you rent a vehicle, the rental contract contains an agreed:
- Start date
- Start time
- Return date
- Return time
- Return location
The rental company plans its fleet around those dates.
For example:
You rent a car from:
1 September at 10:00
until:
10 September at 10:00
Another customer may already have booked the same vehicle or vehicle category from 10 September.
If you decide on 9 September that you want to keep the car for another week, the company cannot automatically agree.
It first needs to check whether the extension fits with future reservations.
This is why rental extensions are normally subject to availability.
How Do I Extend a Blanca Cars Rental?
The process is straightforward.
Step 1 — Check Your Current Return Date
Look at your rental agreement or booking information.
Confirm the exact:
- Return date
- Return time
- Return location
Do not rely on memory.
Step 2 — Decide How Much Longer You Need the Car
Tell Blanca Cars the new date and time you would like to return the vehicle.
For example:
Current return:
10 September at 10:00
Requested new return:
15 September at 10:00
Providing a precise date makes it easier to check availability.
Step 3 — Contact Blanca Cars
Blanca Cars currently asks customers to request an extension at least 24 hours before the existing rental period ends.
The FAQ says customers can submit a request through the Blanca Cars website or call:
+34 653 221 333
Step 4 — Blanca Cars Checks Availability
The existing vehicle may:
- Be available
- Already be reserved
- Be required for servicing or maintenance
- Need to be returned for another operational reason
Blanca Cars will check before approving the request.
Step 5 — Confirm the Additional Rental
If the extension is accepted, make sure you understand:
- New return date
- New return time
- Additional rental cost
- Payment arrangements
- Whether anything else in the contract changes
Only after confirmation should you assume the rental has been extended.
How Much Notice Does Blanca Cars Need?
At least 24 hours before the current rental ends.
This is the extension period stated in the current Blanca Cars FAQ.
For example:
Your rental finishes:
Friday at 10:00
You should request the extension no later than:
Thursday at 10:00
Earlier is better when possible.
If you already know several days before the scheduled return that your plans have changed, contact Blanca Cars then rather than waiting for the final 24 hours.
More notice gives the rental company more opportunity to find a solution.
Can I Ask to Extend Earlier Than 24 Hours Before Return?
Yes.
The 24-hour requirement should be treated as the minimum advance request period, not as a reason to wait until the final day.
If you already know that you need the car for another week, contact Blanca Cars as soon as your plans are clear.
For example:
Your car is due back on 20 August.
On 14 August, you decide to stay until 27 August.
You can request the extension immediately.
This is particularly advisable during busy periods such as:
- July
- August
- Easter
- School holidays
- Christmas and New Year
Fleet availability can be more limited during these periods.
Is an Extension Guaranteed?
No.
An extension is subject to vehicle availability.
The Blanca Cars Terms & Conditions specifically state that extensions require prior authorisation and depend on the availability of the vehicle.
Imagine you have a compact automatic car.
Your rental ends on 15 August.
That vehicle is already allocated to another customer beginning later that day.
Blanca Cars cannot simply allow you to keep the car indefinitely because doing so would affect the next confirmed rental.
An alternative may sometimes be possible, but this depends on fleet availability.
What Happens if My Car Is Already Booked by Another Customer?
If your vehicle is not available for the additional period, Blanca Cars will need to determine what alternatives are possible.
Depending on fleet availability, possibilities could include:
- Returning the existing car as agreed
- Changing to another available vehicle
- Starting a separate new rental
- Extending for fewer days than originally requested
An alternative vehicle is not guaranteed.
This is another reason to request an extension as early as possible.
During July and August, suitable replacement vehicles can become limited.
Do I Have to Pay for the Extra Rental Days?
Yes.
Extending the rental means you are using the vehicle for an additional rental period.
The extra rental time must therefore be paid according to the price and payment arrangements agreed for the extension.
For example:
Original rental:
1–10 September
Approved extension:
10–15 September
You will need to pay for the additional period from 10–15 September according to the extension agreed with Blanca Cars.
The fact that Blanca Cars allows an extension does not mean the additional rental days are free.
Is There an Extension Fee?
Blanca Cars’ current public FAQ does not state a separate administrative extension fee for extending an active car rental.
However, the additional rental period itself must be paid.
The exact amount should therefore be confirmed when the extension is approved.
Do not assume that the original daily price will automatically remain unchanged.
Rental pricing can depend on:
- Additional number of days
- Season
- Vehicle
- Availability
- Existing rental arrangements
Ask for the extension price before confirming it.
How Are Extra Rental Days Calculated?
Blanca Cars calculates rental periods using 24-hour rental periods.
The current FAQ provides the example that a rental from:
Monday 10:00 to Tuesday 10:00
counts as one rental day.
But:
Monday 10:00 to Tuesday 13:00
extends beyond the 24-hour period and is counted as two days.
This can also matter when extending a rental.
For example:
Current return:
Monday at 10:00
New requested return:
Tuesday at 10:00
This adds one 24-hour rental period.
But if the new return is:
Tuesday at 14:00
the additional time can affect how the rental period is calculated.
Read: How Are Rental Car Days Calculated?
Can I Extend for Just One Day?
Yes, if the vehicle is available and Blanca Cars approves the extension.
For example:
Original return:
15 September at 12:00
New requested return:
16 September at 12:00
That is normally an additional 24-hour rental period.
Even a one-day extension must be agreed before the existing contract expires.
Do not assume that keeping the car for “just one more day” is automatically permitted.
Can I Extend for Several Weeks?
Potentially, yes.
There is no reason in principle why an existing rental cannot be extended for a longer period if:
- The vehicle is available
- Blanca Cars approves the extension
- The additional rental price is agreed
- Any necessary contract or payment arrangements are completed
For longer extensions, contact Blanca Cars as early as possible.
A request for another three weeks affects fleet planning considerably more than a one-day extension.
Read: Long-Term Car Hire on the Costa Blanca.
Can I Extend My Rental More Than Once?
Potentially, yes, but each extension needs approval.
For example:
Original rental:
1–10 October
First approved extension:
10–15 October
Later you want to stay until:
20 October
You should contact Blanca Cars again and request another extension.
The first extension does not give you an open-ended right to keep the vehicle beyond the new agreed return date.
Every rental should have a clearly agreed current return date and time.
Can I Extend My Rental While I Am Already on Holiday?
Yes.
This is the most common situation.
Perhaps you originally planned to stay for seven days but decide to stay for ten.
Or:
- Your flight changes
- Your accommodation is extended
- Your return journey changes
- You decide to stay longer
- You need the car for additional appointments
- Your replacement vehicle is delayed
- Your property stay is extended
Contact Blanca Cars before your existing rental expires and request the new return date.
What Happens if My Flight Changes?
If your return flight moves to a later date, contact Blanca Cars as soon as you know.
For example:
Original flight:
20 September
New flight:
23 September
Do not simply keep the vehicle until the new flight.
You must check whether the rental can also be extended until 23 September.
The vehicle’s availability is separate from the airline’s schedule.
Even though your flight has changed, Blanca Cars may have another customer booked for the car.
What if My Flight Is Cancelled?
A cancelled flight can create the same situation.
You may unexpectedly need:
- One more day
- Two more days
- Several additional days
Contact Blanca Cars immediately after you understand how your travel arrangements are changing.
If the vehicle is available, an extension may be possible.
If it is already reserved, Blanca Cars will need to check whether another solution is available.
Do not wait until the scheduled return time has passed.
Can I Extend an Alicante Airport Rental?
Yes, subject to availability and approval.
The same extension rule applies if your Blanca Cars rental is connected with Alicante Airport.
If your trip changes and you need the car longer:
- Contact Blanca Cars.
- Request the additional dates.
- Wait for approval.
- Confirm the additional cost and payment.
- Follow the new return instructions.
If the return date or flight details also change, make sure Blanca Cars has the correct information.
Read: How Does Car Hire at Alicante Airport Work?
Can I Extend a Valencia Airport Rental?
Yes, subject to availability.
Customers using Valencia Airport should follow the same process.
If your original return was planned around a particular flight and the new extension changes that flight information, provide the updated details when requested.
Read: How Does Car Hire at Valencia Airport Work?
Can I Extend a Locally Delivered Rental Car?
Yes.
If Blanca Cars delivered your car to your accommodation in locations such as:
- Jávea
- Dénia
- Moraira
- Calpe
- Altea
- Benidorm
- Villajoyosa
- Other supported Costa Blanca North locations
you can request an extension in the same way.
The vehicle must still be available for the additional dates.
The updated collection or return arrangements should also be confirmed.
What Happens to My Return Collection if I Extend?
If Blanca Cars was originally scheduled to collect the vehicle from your accommodation, that arrangement may also need to be changed.
For example:
Original collection:
10 September at your villa in Jávea
Approved extension:
15 September
The original collection schedule must be changed to reflect the new agreement.
Make sure you have confirmation of:
- New date
- New time
- New location if relevant
Do not assume that changing the rental automatically changes every operational detail unless this has been confirmed.
Can I Change the Return Location When I Extend?
Potentially, but this is a separate request from extending the rental period.
For example, you may originally have arranged:
Return in Jávea
but after extending your holiday you decide you want to:
Return at Alicante Airport
That involves two changes:
- Rental extension
- Return-location change
Both need to be agreed.
Do not assume approval of one automatically means approval of the other.
Can Another Driver Request the Extension?
The rental agreement identifies the renter and authorised drivers.
For changes to the contract, it is best for the person responsible for the booking or rental agreement to contact Blanca Cars.
An additional driver being authorised to drive the vehicle does not necessarily mean that person has authority to change the contractual rental period.
If there is any uncertainty, the main renter should make the request.
Does the Additional Driver Remain Covered During the Extension?
If the extension is formally approved and the rental agreement continues under the agreed conditions, authorised drivers should continue to be governed by the applicable rental agreement.
However, do not add a new driver simply because the rental has been extended.
Any additional driver must be properly authorised.
Blanca Cars’ FAQ states that additional drivers must be listed on the rental contract and must provide their valid driving licence before becoming an authorised driver.
Read: Can Someone Else Drive My Rental Car?
Does Insurance Continue During an Approved Extension?
An approved extension should continue according to the insurance and rental conditions agreed for the extended rental period.
The important word is approved.
Do not assume the contractual protection associated with your rental automatically continues indefinitely if you simply keep the car beyond the agreed return date without authorisation.
The Blanca Cars Terms & Conditions require the renter to obtain prior authorisation before extending the contract.
For this reason, always make sure the extension has actually been confirmed.
Read: What Does Full-Cover Car Hire Mean?
What Happens if I Keep the Car Without Permission?
Do not do this.
If your rental agreement says the vehicle must be returned on:
10 September at 10:00
you cannot simply decide to return it on:
15 September
without contacting the rental company.
The Blanca Cars Terms & Conditions state that the vehicle must be returned on the date and at the place specified in the contract. They also state that an extension requires notification before expiry and prior authorisation from Blanca Cars. Failure to comply can allow the company to legally demand the vehicle’s return.
Keeping the vehicle beyond the authorised rental period can therefore create serious contractual problems.
The correct procedure is always:
Ask first and receive confirmation.
What if I Forget to Request the Extension 24 Hours Before Return?
Contact Blanca Cars immediately.
Do not wait until after the scheduled return time.
Blanca Cars’ published procedure asks for at least 24 hours’ notice.
If you miss that deadline, an extension may be more difficult to arrange because:
- The car could already be allocated to another customer
- A collection could already be scheduled
- Maintenance could be planned
- Staff arrangements may already have been made
Blanca Cars may still be able to help depending on the circumstances and availability, but you should not assume that an extension will be possible.
What if I Only Need the Car a Few Hours Longer?
Contact Blanca Cars.
Rental days are based on 24-hour periods, and going beyond the agreed return time may affect the rental calculation. The Blanca Cars FAQ specifically notes that exceeding a 24-hour rental period can result in an additional rental day being counted.
For example:
Collection:
Monday 10:00
Agreed return:
Tuesday 10:00
Actual desired return:
Tuesday 15:00
Do not assume that the extra five hours are automatically free.
Ask before the scheduled return time so the correct arrangement can be confirmed.
Can I Return the Car Earlier Instead?
Yes, but an early return is different from an extension.
The current Blanca Cars FAQ states that if a customer returns the vehicle before the agreed end of the rental period, unused rental days are not refunded.
For example:
Booked:
1–15 September
Returned:
10 September
The customer should not assume that the remaining five days will automatically be refunded.
Read: What Happens if I Return My Rental Car Early?
Will My Original Rental Price Stay the Same?
Your original confirmed rental price applies to the original agreed rental period.
An extension adds additional rental time.
You should therefore ask Blanca Cars to confirm the price for the extra period.
For example:
Original rental:
€400
Additional five days:
Price to be confirmed
New total:
Original rental + approved extension
Do not calculate the extension yourself and assume the result is correct.
The additional rate can depend on the dates and arrangements applying to your rental.
When Do I Pay for the Extension?
The payment procedure for the extension should be confirmed when Blanca Cars approves it.
This may depend on:
- Rental location
- Existing payment method
- Extension length
- Booking type
The Blanca Cars Terms & Conditions specifically recognise extensions as amounts that may become payable under the rental agreement.
Make sure any additional amount and payment method are clear when the new rental period is agreed.
Example: Extending a Rental in Jávea
Imagine you rent a Blanca Cars vehicle for:
1–10 September
The car is due to be collected from your accommodation in Jávea at:
10:00 on 10 September
On 6 September, you decide to stay until 15 September.
Step 1 — Contact Blanca Cars
You ask whether you can keep the vehicle until 15 September.
Step 2 — Availability Is Checked
Blanca Cars checks whether that vehicle is required for another booking.
Step 3 — Extension Is Approved
The vehicle is available.
Blanca Cars confirms the new rental period and additional price.
Step 4 — New Return Is Confirmed
Your new collection date becomes:
15 September
Step 5 — Continue the Rental
You keep the same vehicle until the newly agreed return date.
This is a normal authorised extension.
Example: The Vehicle Is Already Booked
Now imagine the same situation, but another customer has already reserved your vehicle from 10 September.
You ask:
Can I keep it until the 15th?
Blanca Cars checks the booking schedule and finds that the car must be returned.
The original vehicle therefore cannot simply be extended.
Depending on availability, Blanca Cars may be able to discuss another arrangement, but there is no guarantee that another vehicle will be available.
This is why:
Extension requests are subject to availability.
Example: Flight Cancelled on the Last Day
Imagine your vehicle is due back at Alicante Airport at 12:00.
At 07:00, your airline cancels your flight and moves you to a flight two days later.
You still need transport.
The wrong approach is:
Keep the rental car for another two days without telling anyone.
The correct approach is:
- Contact Blanca Cars immediately.
- Explain that your flight has been cancelled.
- Give the new travel date.
- Ask whether the rental can be extended.
- Wait for confirmation.
- Agree to any additional rental cost.
- Follow the new return instructions.
Because this request is being made with less than the recommended 24 hours’ notice, availability cannot be assumed.
Should I Extend or Make a New Booking?
Usually, start by asking to extend the existing rental.
If the same vehicle is available, this is often the simplest solution.
However, in some circumstances Blanca Cars may need to use another arrangement.
For example:
- Current vehicle is already booked
- You need a different vehicle size
- Your return location changes significantly
- The extension becomes a much longer rental
- Operational requirements mean the existing vehicle must be returned
Let Blanca Cars determine the most appropriate option rather than creating a second online reservation for the same dates without explaining the existing rental.
Should I Make a New Online Booking Myself?
Not without first contacting Blanca Cars about the active rental.
If you already have the vehicle and want to extend, the existing contract needs to be considered.
Creating a completely separate online booking could result in:
- Duplicate reservations
- Different vehicle allocation
- Conflicting collection times
- Incorrect pricing assumptions
Contact Blanca Cars and explain that you are currently renting a vehicle and want to extend the rental period.
Does Extending My Rental Change the Fuel Policy?
Normally, no.
An extension changes the duration of your rental.
It does not automatically change the agreed fuel policy.
Blanca Cars currently uses a full-to-full fuel policy: the vehicle is supplied with a full tank and should be returned with a full tank according to the rental conditions.
If the rental is extended, you continue using the vehicle and return it according to the agreed fuel conditions at the new end of the rental.
Read: How Does a Full-to-Full Fuel Policy Work?
Does Extending Change My Mileage Allowance?
Check the rental conditions applying to your particular vehicle.
If your rental has mileage conditions or limitations, extending the dates does not automatically remove those conditions.
For a longer extension, ask whether any mileage provision changes.
What if I Want to Extend Because I Am Buying a Property or Staying Longer?
This is common on the Costa Blanca.
Customers may originally rent for a holiday and then decide they need the vehicle longer because they are:
- Completing a property purchase
- Viewing properties
- Waiting for their own car
- Moving to Spain
- Staying for renovation work
- Extending a winter stay
- Waiting for a leased vehicle
Tell Blanca Cars how long you realistically expect to need the car.
If the extension becomes several weeks or months, a longer-term rental arrangement may be more appropriate.
Read: Long-Term Car Hire on the Costa Blanca.
Extension Before the Rental Starts vs After It Starts
These should be treated as two different situations.
Before the Rental Starts
You may realise before arrival that your holiday dates have changed.
This is a booking modification.
The current Blanca Cars FAQ states that bookings can be extended before pickup subject to availability and the applicable notice requirements.
After the Rental Starts
You already have the vehicle and want to keep it beyond the contracted return date.
This is an active rental extension.
Blanca Cars asks for this extension to be requested at least 24 hours before the rental ends.
The vehicle’s availability must be checked in both cases.
Spanish Rules vs Rental Company Policy
Spanish Law
Spanish law determines matters such as:
- Driving requirements
- Traffic laws
- Vehicle insurance obligations
- Valid driving licences
- Driver responsibilities
Rental Company Policy
The rental agreement determines:
- Start and end dates
- Extension procedure
- Extension price
- Return location
- Authorised drivers
- Vehicle availability
- Payment arrangements
The ability to extend a rental car is therefore primarily governed by the rental agreement and approval from the rental company.
With Blanca Cars, prior authorisation is expressly required before the contract term is extended.
Common Rental Extension Mistakes
Assuming You Can Just Keep the Car
You cannot assume the rental automatically continues.
Get approval.
Waiting Until After the Contract Has Expired
Request the extension before the end of the existing rental.
Waiting Until the Last Minute
Blanca Cars asks for at least 24 hours’ notice.
Earlier is better.
Assuming the Car Is Available
It may already be reserved for another customer.
Assuming Extra Days Are Free
An approved extension adds additional rental time and cost.
Assuming the Same Daily Rate Automatically Applies
Ask Blanca Cars for the extension price.
Changing Your Flight but Not Your Rental
Airline changes do not automatically change your car-rental agreement.
Creating Another Online Reservation Without Mentioning Your Existing Rental
Contact Blanca Cars first.
Assuming a Few Extra Hours Do Not Matter
Rental days operate on 24-hour periods, so exceeding the agreed return time can affect the rental calculation.
Assuming an Additional Driver Can Keep the Car After the Contract Ends
Authorised-driver status does not extend the rental agreement.
Frequently Asked Questions
Can I extend my rental car after the rental has started?
Yes, subject to approval and vehicle availability.
Contact the rental company before your existing rental agreement expires.
Can I extend a Blanca Cars rental?
Yes.
Blanca Cars allows customers to request an extension, subject to vehicle availability and prior approval.
How much notice do I need to give Blanca Cars?
The current Blanca Cars FAQ asks customers to request an active rental extension at least 24 hours before the current rental period ends.
Is the extension guaranteed?
No.
The car may already be reserved by another customer. Blanca Cars’ Terms & Conditions specifically make extensions subject to vehicle availability.
Do I have to pay for the additional days?
Yes.
The extension adds additional rental time. Blanca Cars will confirm the applicable cost and payment arrangements when approving the extension.
Is there a separate extension fee?
The current public Blanca Cars FAQ does not specify a separate administrative extension fee for an active car rental. However, the additional rental period itself must be paid.
Can I extend for one day?
Yes, if the vehicle is available and the extension is approved.
Can I extend for several weeks?
Potentially, yes.
For a long extension, contact Blanca Cars as early as possible because availability becomes more important.
Can I extend more than once?
Potentially, but every new extension must be agreed.
Can I extend at Alicante Airport?
Yes, subject to availability and approval.
Can I extend at Valencia Airport?
Yes, subject to availability and approval.
Can I extend a car delivered to my villa?
Yes, subject to availability. The new collection date and time should also be confirmed.
What if my flight is cancelled and I suddenly need the car longer?
Contact Blanca Cars immediately.
Even if you have less than the recommended 24 hours’ notice, explain the situation and ask whether an extension can be arranged. Do not simply keep the vehicle without approval.
What happens if I keep the car after the agreed return time without permission?
This can put you in breach of the rental agreement. Blanca Cars’ Terms & Conditions require the vehicle to be returned at the agreed time and place unless an extension has been authorised.
Can I change the return location at the same time?
Potentially, but changing the return location is a separate request and must also be approved.
The Simple Answer
If you remember only one thing from this guide, remember this:
Yes, you can request to extend a Blanca Cars rental after it has started, but you must contact Blanca Cars before the existing rental expires and receive approval.
With Blanca Cars:
Can an active rental be extended? Yes
Minimum requested notice: 24 hours before current rental ends
Extension guaranteed? No
Subject to vehicle availability? Yes
Prior Blanca Cars approval required? Yes
Additional rental days payable? Yes
Can you simply keep the vehicle? No
Can airport rentals be extended? Yes, subject to availability
Can local-delivery rentals be extended? Yes, subject to availability
For the smoothest process, request the extension as soon as you know you need the car longer.
Blanca Cars Extension Policy
The current Blanca Cars FAQ states that customers who want to extend an active rental must make the request 24 hours before the end of the rental period and can do so through the website or by telephone.
The Blanca Cars Terms & Conditions provide the contractual rule: a renter wishing to extend must notify Blanca Cars before the contract expires and receive prior authorisation, with approval depending on vehicle availability.
Together, these rules mean that an extension should be considered confirmed only after Blanca Cars has accepted the new rental period.
Related Blanca Cars Guides
Continue with:
- How Does Car Hire Work in Spain?
- How Far in Advance Should I Book a Rental Car?
- Do I Need to Prepay for Car Hire?
- Can I Hire a Car in Spain Without a Credit Card?
- Can I Use a Debit Card for Car Hire?
- Can I Pay Cash for Car Hire?
- How Are Rental Car Days Calculated?
- Can I Change My Car Hire Booking?
- What Happens if I Return My Rental Car Early?
- Long-Term Car Hire on the Costa Blanca
About This Guide
This guide explains extending an active rental car in Spain generally and separately identifies the current extension procedure published by Blanca Cars.
An extension is a contractual change and depends on the rental company’s approval, vehicle availability and the additional rental arrangements agreed with the customer.
For Blanca Cars customers, your original rental agreement together with the confirmed extension should be treated as the final source for the authorised rental period.
Published by: Blanca Cars
Reviewed by: Blanca Cars Operations Team
Last reviewed: 27 August 2026
Review frequency: At least annually and whenever Blanca Cars extension or rental procedures change.