Web application development
for London businesses.
We design and build custom web applications — fast, accessible and built to last. From internal tools to customer-facing platforms, we handle the full stack so you don't have to.
What kind of web apps do we build?
Every project is different. Here are the most common types we work on for UK clients.
Internal Business Tools
Dashboards, CRMs, inventory systems and workflow automation. We replace spreadsheets and manual processes with clean, purpose-built software your team actually wants to use.
Customer-Facing Platforms
Booking systems, client portals, marketplace platforms and SaaS products. Built for scale, with security and usability as standard — not afterthoughts.
MVPs for Startups
Need to validate your idea quickly? We build lean, functional MVPs that let you test with real users without overspending. Scope defined, timeline clear, no surprises.
Legacy System Modernisation
Old systems holding your business back? We assess, refactor and modernise — incrementally or wholesale — with minimal disruption to your day-to-day operations.
Data & Reporting Apps
Real-time dashboards, analytics platforms and reporting tools. We connect your data sources and deliver clear, fast interfaces for better business decisions.
Third-Party Integrations
Stripe, Xero, Salesforce, Slack, or any API you rely on. We build the glue that makes your tools talk to each other — reliably and securely.
Our web development stack
We choose technology based on what fits your project — not what's currently fashionable. These are the tools we use most often.
Frontend
Backend & Database
Cloud & Infrastructure
Tools & Practices
From idea to live product — step by step.
Common questions about web app development in the UK.
How much does web app development cost in the UK?
Costs typically range from £5,000 for a simple internal tool to £50,000+ for a complex platform. After a free consultation, we provide a detailed, fixed-scope quote — no vague day rates.
How long does it take to build a web application?
A straightforward web app takes 6–12 weeks. Complex platforms with multiple integrations or custom workflows can take 3–6 months. You'll know the timeline before we start.
Do you work with startups as well as established businesses?
Yes — we work with both. Early-stage startups building an MVP and established SMEs modernising old systems. We adjust our approach to suit where you are.
Will I own the code at the end?
Yes, absolutely. You own 100% of the source code, repositories and all assets built for your project. No lock-in.
Can you take over an existing project?
Yes. We regularly take on projects that have stalled, are unfinished or need a different approach. We start with a code review so you know exactly what you're working with.
Are you based in London?
Yes. Mantar Tech LTD is registered in England and Wales, with our registered office in East Ham, London E6. We work with clients across London and throughout the UK.
We also offer
Mobile App Development
iOS and Android apps — native or cross-platform. Built to complement your web app or stand alone.
Learn more →Custom Software Development
Desktop apps, automation tools, bespoke platforms. If off-the-shelf software doesn't cut it, we build what does.
Learn more →Technical Consulting
Architecture review, tech stack advice, roadmapping. An independent perspective before you commit to a build.
Learn more →