Shipping a SaaS product is only half the job. Once real users log in, your platform needs monitoring, bug fixes, security patching, dependency upgrades and small feature work on an ongoing basis. By Design UK offers a UK-based SaaS maintenance retainer that sits between hiring an unpredictable freelancer and signing a slow, expensive agency contract — with fixed monthly pricing and full ownership of your codebase throughout.
We built and continue to run Tackly.co.uk, a live multi-toolkit SaaS platform, so we’re not theorising about maintenance from a sales deck. We patch, monitor and extend Tackly ourselves every week, which means the retainer processes we sell are the same ones keeping our own product online.
Our support plans start from £797/month for SaaS platforms, scaling with the size of your codebase and the volume of ongoing work required. If you run a Shopify storefront rather than a SaaS product, we also offer dedicated Shopify support from £299/month, covering theme updates, app conflicts and storefront reliability.
Most UK SaaS maintenance retainers range from a few hundred pounds a month for a small MVP with light ongoing needs, up to several thousand pounds a month for platforms with high transaction volumes, multiple integrations, or compliance requirements. By Design UK’s retainers begin at £797/month, priced against a fixed scope agreed upfront — not an hourly rate that creeps once work begins. You always know what a month of support costs before it starts, and there’s no lock-in disguised as a “partnership.”
For context, if you’re still validating an idea or planning a new build, our SaaS development service covers everything from MVPs to enterprise platforms, typically ranging from £18,000 to £650,000+ depending on complexity. A maintenance retainer picks up once that build is live, protecting the investment you’ve already made.
Freelancers are often the cheapest option on paper, but they’re a single point of failure: if they get busy, go on holiday, or move on, your platform’s continuity goes with them. Many also build in ways that make handover difficult, leaving you dependent on one person indefinitely. Traditional agencies solve the reliability problem but introduce new ones — long onboarding cycles, opaque day-rate billing, layers of account management, and contracts that quietly retain rights over parts of your own code.
By Design UK sits deliberately between the two. You get a small, accountable UK team, fixed-price retainers with no surprise invoices, and full source code ownership from day one — the same terms we apply to our own product, Tackly.co.uk. There’s no freelancer risk and no agency bloat, just a working process built around keeping your platform stable and improving month on month.
A retainer makes sense once your SaaS product has paying users and downtime or bugs carry a real cost. It suits founders who built an MVP quickly and now need it stabilised, teams who inherited a codebase from a previous developer, and growing platforms that need a steady stream of small improvements without commissioning a full project every time. If you’re not sure whether you need a retainer or a larger development sprint, our contact page is the fastest way to get a straight answer.
You can also read more about how we work, our AI-accelerated delivery approach, and the team behind Tackly.co.uk on our about page.
It typically covers uptime monitoring, security patching, dependency updates, bug fixes, minor feature work and monthly reporting, all delivered under a fixed monthly fee agreed in advance.
Yes. Full source code ownership is part of every engagement, whether it’s a new build or an ongoing support retainer, so you’re never locked into working with us.
Yes, this is one of the most common reasons clients start a retainer with us. We audit the existing codebase first, then set up monitoring and a fixed monthly plan around what we find.
Retainers are priced as a fixed monthly fee based on scope, not billed hourly, so costs stay predictable. Plans start from £797/month for SaaS platforms and £299/month for Shopify support.
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