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St Bees Builders

Extension & building cost calculator

What will my extension cost in West Cumbria?

Pick your project, size and finish for a rough 2026 price range and build time. Takes under a minute. Then send us your drawings or book a free visit for a proper price.

1What are you planning?

2How big? (new internal floor area)

m²
Don't know the m²? Work it out from length × width
×

For two storeys, enter the total of both floors. Measure inside the walls if you can.

3Finish level

4Extras

Your rough guide

£0to£0

excluding VAT, design fees and planning

Build time on site-
Works out at-

Rough guide only, not a quote. Prices vary with design, ground conditions and access. Final price after a free site visit.

Call Chris WhatsApp Get an accurate price

Planning an extension? Read about our extensions, what drives a single storey extension cost, or see extensions in Whitehaven and Workington. · Extensions in Egremont · Extensions in Cockermouth

Free site visit

Want an accurate price? Upload your drawings or book a free visit

Chris will look over your plans or come out to measure up, check access and ground, and give you a fixed written quote. No obligation.



We aim to reply within 24 hours. We answer every enquiry and turn up when we say we will.

Rather talk? 07546 971358 · WhatsApp · stbeesbuilders@gmail.com

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