Get a rough, honest idea of the likely build cost before you go any further. Pick your project, set the size and finish, and we'll show a typical range — clearly marked as an estimate, not a quote.
Indicative build cost — estimate only
£44,000 – £64,000
for a 20 m² single-storey extension (standard finish)
A rough guide to typical build costsin the North West — this is the contractor's price, not our design fee and not a quote. Real costs vary widely with site conditions, specification, access and finishes, and are only confirmed by a builder after a proper survey. Figures exclude VAT, professional fees, planning and building-control fees, and any structural or party-wall work.
Every home and site is different. Foundations, drainage, access, the level of finish and unforeseen issues all move the cost. A genuine figure only comes from a builder pricing real drawings after a survey — which is exactly what our design pack lets them do, accurately.
We're design only — we prepare the drawings your project needs so builders can price and build from them. That keeps the costing honest: you compare like-for-like quotes against one clear set of drawings. See our services.
Prefer to picture it first? Try the concept visualiser.
Send Sean your postcode, a few photos and the size you're thinking of — you'll get an honest first view of the design and the likely route, with no obligation.