How Much Does It Cost to Build an App in London?
London App Development Price Bands in 2026
Most London app quotes fall into three recognisable tiers. The tier you sit in is decided by scope, not by how "important" the app is to your business — a simple booking app for a Clapham dental practice and a simple booking app for a Shoreditch fitness studio cost roughly the same, because they need the same number of screens and the same payment plumbing.
Starter
Cross-platform React Native build, up to 5 core screens, user sign-in, push notifications, one API integration, iOS + Android release, 30-day bug-fix support. Right for a first version or a single-purpose tool.
Growth
Up to 15 screens, bespoke Figma UI, payment gateway, basic admin dashboard, in-app analytics, App Store and Google Play submission, 60-day support. Where most London SME projects land.
Scale
Unlimited screens, complex custom logic, real-time features, CMS backend, multi-language support, load testing, 90-day support retainer. For platform-style products and marketplaces.
Those are one-off fixed prices, quoted before work starts and itemised line by line. Ongoing maintenance — iOS and Android OS updates, security patches, performance monitoring and small enhancements — runs from £299/month and is optional, not bundled in to inflate the headline figure.
What a London Agency Charges vs What You Actually Need
The gap between a London agency quote and the work required is often uncomfortable to look at. A central London studio with a Soho or Farringdon office is carrying rent, account managers and a sales layer, and that lands in your day rate long before a developer opens an editor.
| App type | Typical London agency | Consult Wasfa | Realistic timeline |
|---|---|---|---|
| Simple utility or booking app 5 screens, no payments | £12,000 – £20,000 | From £2,999 | 6–8 weeks |
| Customer app with payments accounts, checkout, admin panel | £20,000 – £35,000 | From £6,999 | 10–14 weeks |
| Two-sided or marketplace app real-time, messaging, CMS | £40,000 – £80,000+ | From £14,999 | 14–20 weeks |
| Ongoing maintenance OS updates, patches, monitoring | £800 – £2,500/month | From £299/month | Rolling, 30-day notice |
The difference is not developer seniority — it is overhead and margin structure. Our team works remotely, which removes the London office cost from your invoice while keeping senior Swift, Kotlin and React Native engineers on the build.
The Seven Things That Actually Move Your Quote
1. Screen count and feature depth
Screens are the closest thing the industry has to a unit of cost. Every screen needs design, build, state handling, error states and testing on multiple device sizes. Going from 5 screens to 15 does not double the price — it roughly triples it, because the interactions between screens grow faster than the screens themselves.
2. Native versus cross-platform
Building separate Swift and Kotlin apps means writing and testing everything twice. React Native lets one codebase serve both stores and typically cuts total cost by 30–50%. Native is worth the premium when you depend heavily on device hardware — advanced camera work, Bluetooth peripherals, background location, or ARKit. For the majority of London SME apps, cross-platform is the correct commercial answer.
3. Payments and regulated data
The moment money moves through the app, cost rises. Stripe, Worldpay or GoCardless integration, Strong Customer Authentication under UK PSD2 rules, refund handling and receipt flows add development and a meaningful amount of testing. Handling health records or anything sensitive adds UK GDPR obligations, encryption at rest, and an audit trail — budget for it upfront rather than discovering it in week eight.
4. Integrations with what you already run
An app that talks to your existing booking system, EPOS, CRM or Shopify store is only as easy as those systems' APIs. A clean, documented API is a day or two. A legacy system with no API, or a CSV export as its only integration route, can add weeks. Ask your incumbent supplier for API documentation before you brief anyone.
5. Bespoke design versus a design system
A fully bespoke visual identity with custom illustration and motion design costs more than a well-executed build on a proven design system. Both can look excellent. The question is whether your differentiation genuinely lives in the interface, or in the service the interface unlocks.
6. Backend and infrastructure
Apps rarely live alone. User accounts, content management, push notification services and analytics all need somewhere to run. Managed services keep the build cost down; a bespoke backend gives more control but costs more up front and monthly. Cloud hosting for a typical London SME app runs £20–£150/month depending on traffic.
7. App Store compliance and launch
Apple charges £79/year for a developer account and Google Play a one-off $25. Beyond the fees, submission means privacy nutrition labels, data-use declarations, screenshots at multiple sizes, and a rejection-and-resubmission cycle that is normal rather than alarming. Budget two weeks between "feature complete" and "live in both stores".
What London Small Businesses Actually Build
Across Greater London the same handful of app briefs recur. Hospitality operators in Shoreditch and Soho want loyalty and pre-order apps that cut card fees and bring repeat covers. Dental and physio practices in Clapham, Fulham and Islington want booking and reminder apps that reduce no-shows. Trades businesses in Croydon and Bromley want field-service apps for job sheets, photos and invoicing on site. Independent retailers want a companion app to a Shopify store so repeat customers checkout in two taps rather than seven.
The common thread is that none of these are original ideas, and that is the point. The commercially safest London app is a well-executed version of something with proven demand in your sector — not a novel concept that has to educate its own market.
Hidden Costs London Businesses Miss
The build quote is not the total cost of ownership. The four items that most often surprise first-time app owners:
Maintenance is not optional. Apple and Google ship major OS releases annually, and an unmaintained app degrades and eventually gets delisted. Budget from £299/month.
Getting downloads costs money. An app nobody has heard of gets installed by nobody. Plan for App Store Optimisation, in-store signage, email prompts and often paid acquisition. Many London businesses spend as much on driving installs in year one as on the build.
Content and data entry take time. Someone has to populate the catalogue, write the notifications and keep the listings current — usually you.
Version two is a certainty. Real users always reveal something the brief did not. Hold back roughly 20% of your budget for the first round of post-launch changes.
Should a London Business Build an App or a Website First?
If you do not yet have a fast, mobile-first website that converts, build that first — it costs less, gets found in Google, and needs no download. A website is discovery; an app is retention. Apps earn their keep when you have repeat customers who will use it more than a few times a month: bookings, loyalty, ordering, field service. A one-off transaction almost never justifies asking someone to install something. If you are weighing both, our web development in London service page sets out the website side, and a progressive web app is often the sensible middle path — installable, no store required, and cheaper than a native build.
How to Get an Accurate App Quote
Vague briefs get padded quotes, because the agency prices the risk of the unknown. To get a tight number, bring four things: a one-page description of what the app must do on day one, a list of the systems it has to talk to, your realistic budget range, and a launch date with the reason behind it. Ask any agency for a fixed price rather than an hourly estimate, confirm in writing that source code and store accounts transfer to you on final payment, and check what is included after launch. A quote that cannot answer those three questions is not a quote — it is an opening position.