Describe it, or show it
Start from a few sentences or a photo. Plumb & Square works out what you're building, sensible dimensions, materials and a build approach — and tells you plainly if it's a kind of build we haven't tested yet.
Plan it true. Build it fair and square.
Plumb & Square is the honest build-vs-buy planner for UK DIYers. Describe your project — an alcove shelf, a garden bench, a shed — and get real materials costs from UK retailer pricing, an exact cut list, step-by-step assembly drawings and a build guide, then an honest verdict on whether you'd be better off buying it ready-made. Even when that earns us nothing.
Free to join the early-access list. No spam, just the launch.
Everything you need to decide — and to build
From a rough idea to a costed plan, drawings you can build from, and a guide you can take to the workshop.
Honest cost comparison
Real materials costs from UK retailer pricing, set against ready-made options with their source and a price range — and we'll tell you plainly when buying wins. No thumb on the scale.
Cut list, drawings, build guide
An exact cut list where every piece is traced to something on your shopping list, step-by-step assembly drawings generated from that cut list, and a build guide with honest time estimates.
Tested on real builds
In alpha we've tested Plumb & Square on raised beds and planters, garden sheds, pergolas, ground-level decking, garden benches and outdoor seating, alcove shelves and bookcases, workbenches, and log and bin stores. Anything else gets a best-effort first pass — and we'd love to hear how it went.
Early access - be first in
We're in alpha and improving every week. Leave us a note and we'll let you in as soon as we can — that's the only thing we'll use it for.
Email us to join the list