SaaS development
agency in
London.

What is SaaS web development?

SaaS (Software as a Service) web development is the process of building a subscription-based web application that users access via a browser — as opposed to software they download and install. A SaaS product typically includes user authentication, a subscription billing system (most commonly Stripe), a core feature set delivered through a web dashboard, and a marketing site that acquires users. SaaS development differs from standard website development in its technical complexity: you are building a product with accounts, payments, permissions, and data that persists between sessions.

How much does SaaS development cost in the UK?

SaaS development costs in the UK typically range from £15,000 to £35,000 for a focused MVP (authentication, core feature set, Stripe billing, and a marketing site). More complex products with advanced multi-tenancy, multiple user roles, usage-based billing, or significant data processing typically cost £35,000 to £70,000. Enterprise SaaS builds with SSO, custom integrations, and large-scale architecture start from £80,000. At WebAnts, all projects are flat-quoted after a free scoping call — no hourly rates, no scope creep surprises.

How long does it take to build a SaaS MVP in London?

A focused SaaS MVP — authentication, core feature set, Stripe subscriptions, and a marketing site — typically takes 8 to 14 weeks with WebAnts. More complex products with advanced billing, multi-tenancy, or significant data pipelines take 16 to 24 weeks. We agree a firm timeline in the written proposal and ship weekly staging updates throughout the build. WebAnts delivers roughly 1.8 times faster than the industry average by agreeing a precise scope before writing code.

What tech stack does WebAnts use for SaaS development?

We build SaaS products on Next.js 14 (App Router) with TypeScript, PostgreSQL or Supabase as the database, Prisma or Drizzle as the ORM, Clerk or Auth.js for authentication, Stripe for billing and subscriptions, and Vercel for deployment. For data-heavy products we add tRPC for typesafe APIs, Recharts or Tremor for dashboards, and Sentry plus PostHog for monitoring and analytics. This stack is chosen for developer productivity, SEO performance of the marketing site, and long-term maintainability.

Should I hire a SaaS agency or a freelancer for my MVP?

For a SaaS product, a specialist agency has three significant advantages over a freelancer: breadth of skills (design, frontend, backend, billing, DevOps, and SEO need to work together from day one), accountability (a firm is accountable for delivery in a way an individual is not), and process (an agency that has built multiple SaaS products has solved the hard problems of auth, multi-tenancy, and Stripe webhooks before). Freelancers are better suited to well-defined single-skill tasks. WebAnts handles the full stack — from Figma to deployed production application — with milestone payments so you own each deliverable as it lands.

What does a SaaS MVP actually include?

A WebAnts SaaS MVP includes: a written product specification, Figma designs for the app and marketing site, authentication (email/password and social OAuth), the agreed core feature set, Stripe subscription billing with a billing portal, a basic user dashboard, an SEO-optimised marketing site, deployment to Vercel or Railway, and runbook documentation. It deliberately excludes features that can be added post-validation — admin panels, advanced analytics, enterprise SSO, third-party integrations — to keep the timeline tight and get the product in front of paying users fast.

Can WebAnts build a SaaS marketing site that ranks on Google?

Yes, and we strongly recommend building the marketing site alongside the app rather than after launch. A SaaS product without a marketing site ranking for its target keywords is leaving organic growth on the table from day one. We build Next.js marketing sites with on-page SEO, FAQPage and Service schema markup for AI engine visibility (ChatGPT, Perplexity, Gemini), Core Web Vitals optimisation, and a content structure targeting the exact search terms your ideal customers use.

Do you build SaaS products for London startups only, or internationally?

WebAnts is based in London but we build SaaS products for clients across the UK, United States, Europe, and worldwide — we have delivered projects for clients in 14 countries. For London-based startups and scale-ups, we are available for in-person discovery sessions and workshops. For international clients, we work fully remotely with weekly video check-ins and staging updates.