Quick answer: UK and US agencies that publish their prices quote roughly £10,000 to $50,000 for a first version of a custom booking system with payments, built in 4 to 8 weeks, and £25,000 to £60,000 for a full platform. Car rental software built from scratch is quoted at $80,000 to $200,000. Upkeep is commonly put at 15 to 20% of the build cost a year, and one benchmark measured more. A ready car rental booking engine costs a monthly fee instead: Nomora is €55 a month for up to 10 vehicles, or €40 a month billed yearly.
"How much for online booking on our website?" gets very different answers depending on who you ask. A freelancer may say a few hundred euros. A software agency may say fifty thousand. They are quoting different things. The low price is usually a form that emails you. The high one is a real booking system.
Below are published prices from agencies, what each level buys a rental company, what it costs to keep running, and when building your own makes sense.
What agencies charge for a custom booking system
These are prices the agencies publish themselves. They are not quotes for your project.
| Source | What it covers | Price | Time |
|---|
| Magora, UK | Booking MVP covering your main booking type | From £10,000 | 6 to 8 weeks |
| Magora, UK | Full booking platform with payments, roles and integrations | £25,000 to £60,000 | Not stated |
| WeBridge | Booking MVP with availability, online booking and payments | $20,000 to $50,000 | 4 to 8 weeks |
| RaftLabs | Car rental software: availability, pricing, inspections, maintenance | $80,000 to $200,000 | 10 to 20 weeks |
Two things stand out. First, an "MVP" covers one booking type and the basics. A rental company needs more than that before it can switch off the phone. Second, the agency that quotes £10,000 also says that for simple bookings a ready-made tool "is usually the better choice". That is an honest agency.
What a rental company needs the build to include
A booking system for cars is harder than one for haircuts. The car is a specific object that is either on the drive or out with someone, the price depends on dates, and money comes back to the customer after the rental. The minimum list:
- Availability per vehicle, including cars out for service or blocked by staff.
- Prices by duration and season, with extras, insurance, fees, VAT and promo codes.
- Online payment, an advance or the full amount, and a balance paid later.
- A security deposit that you can refund to the card after return.
- Rental terms the renter accepts, and a contract.
- Confirmation emails to the renter and a notification to you.
- A staff side: a calendar, phone bookings, edits, cancellations and refunds.
- A check at the moment of payment so two people can't book the same car.
The full list with what to check is in what a car rental booking system needs. If a quote doesn't name these, it is probably for the form.
What it costs to keep running
The build is the smaller part of the bill over a few years. The software has to keep working while the things around it change: browsers, the payment provider's API, card security rules, your own prices and policies.
And every change you want later, such as a new extra, a second location or a different deposit rule, is a new job for the developer.
What a ready booking engine costs
A rental booking engine spreads the build and the upkeep across many rental companies, so you pay a subscription. Nomora's prices, before VAT:
| Plan | Vehicles | Monthly billing | Yearly billing |
|---|
| Starter | 1 to 10 | €55 a month | €40 a month |
| Business | 11 to 35 | €119 a month | €89 a month |
| Fleet | 36 and more | €119 plus €2.40 per vehicle above 35 | €89 plus €1.80 per vehicle above 35 |
Payments collected through Nomora carry a 1% processing fee, on top of Stripe's or Montonio's own fees. Your own booking domain is €25 a month if you want one. The booking page, the website booking blocks, the calendar, contracts and payments are in every plan. See pricing for other currencies.
A rough comparison over three years, using only the figures above: a 10-car company on Starter, billed yearly, pays €1,440. The cheapest custom MVP above is £10,000 to build, and Magora's support starts at £1,000 a month on top. The custom system also has to include the staff calendar, contracts and refunds. A booking engine already has them.
When building your own makes sense
Custom is the right call for some businesses:
- Booking is your product, for example a marketplace where other companies list cars.
- Your rental model doesn't fit any software, and you have checked several.
- You have hundreds of vehicles and your own developers to look after the system.
For a company with 5 to 50 cars and one website, the money usually goes further on marketing and cars.
The middle path: let the agency design, plug in the booking
You don't have to choose between your web agency and a booking engine. The agency designs the site, writes the pages and does the SEO. The booking blocks go into their design with one script tag or the WordPress plugin, and they style them with the site's colours. The agency still gets paid for the work it is good at, and you don't own a booking system you have to maintain.
Get it set up
Book a free 30-minute setup call and send your vehicle list in any format. Your fleet, prices and booking page go live in Nomora within 48 hours, and the booking link or the booking blocks go onto your website on the same call. If you would rather click through it yourself, start a 14-day free trial. No card needed.
Frequently asked questions
How much does it cost to build a booking system?
Published agency prices in 2026 start at about £10,000 for a first version (Magora, UK) or $20,000 to $50,000 for an MVP with availability and payments (WeBridge). Full platforms are quoted at £25,000 to £60,000, and full car rental software at $80,000 to $200,000 (RaftLabs).
How long does it take to build a custom booking system?
Agencies quote 4 to 8 weeks for a first version and 10 to 20 weeks for full car rental software. A ready booking engine can take bookings within days.
How much does a booking system cost to maintain?
A common rule of thumb is 15 to 20% of the build cost every year. A benchmark of 24 software products measured a median of 21 to 26% a year over three years.
Why did my web developer quote so little for online booking?
A low quote usually means an inquiry form: the renter fills in dates and a car, and you get an email. It doesn't check availability, show a total price or take payment. Ask what exactly happens after the renter presses Book.
Is custom software better than off the shelf for car rental?
Only when booking is your product, your model fits no existing software, or you have your own developers. For most fleets under 50 cars a ready booking engine costs less and is live sooner.
Set this up on your own fleet
Book a free 30-minute setup call. Send your vehicle list in any format, and your fleet, bookings and contract template are live in Nomora within 48 hours. Or start a 14-day free trial on your own. No card needed.
