Most Milton Keynes homeowners ask about cost before anything else. That is completely understandable — and unlike a lot of builders in MK we are happy to give a straight answer rather than deflect until a site visit has happened.
Crownhill Building Services has been working across Milton Keynes since 2006. The projects we have delivered in that time range from tight kitchen extensions in Bletchley and Oldbrook to full two storey builds in Westcroft and Wavendon Gate. One thing has stayed constant throughout — the way we approach pricing. Figures agreed upfront in writing with no additions buried in the small print and no awkward conversations when the final invoice lands.
How We Calculate the Cost of a Home Extension
We work on a per square metre rate. From £2,200 per square metre (£2,640 inc. VAT) — and that figure holds regardless of how large or small the project turns out to be. No sliding scale no volume discounts no penalties for smaller builds. What we quote is what you pay.
The total home extension cost in MK is shaped by your specific location and what the project actually involves. Ground conditions vary considerably across Milton Keynes. A build in Crownhill sits on different soil to one in Loughton or Newport Pagnell and site access in an established street affects programme and logistics differently than a more open plot. All of this goes into the quote — which is why the site visit comes first.
What the Price Covers
Everything. Architectural drawings and structural engineering. Foundation preparation and groundwork. The structural frame brickwork and roofing. Internal plastering flooring and fit-out. All services connections. And Building Control from start to sign-off.
Building Control tends to be the part homeowners think least about until it becomes a problem. It is the statutory inspection process that confirms your extension meets building regulations — and it runs throughout the project not just at the end. We manage every stage of it directly. Scheduling inspections chasing sign-offs dealing with queries from the inspector — all of that sits with us not with you.
What Two Decades of Work in MK Actually Means
Reputation in the building trade is built slowly and lost quickly. We have been working in Milton Keynes long enough to know that the quality of the finish is what clients remember — and what their neighbours notice. The brickwork that matches the existing property. The joinery that fits cleanly. The internal plastering that does not show movement six months later.
Our Google reviews reflect that. Clients in Wolverton Newport Pagnell Westcroft and Wavendon Gate have taken the time to write about punctuality site tidiness communication and finish quality. One described the result as feeling like it had always been there. We have been trying to earn that comment on every project since 2006.
Guarantees and Insurance
A 12-month parts and labour warranty runs from completion on every project we deliver. Public liability cover sits at £2 million throughout the build. All contractors working on your project hold current Gas Safe NICEIC NAPIT Checkatrade and FENSA accreditations — not as a formality but because the work demands it.
Getting an Accurate Figure for Your Project
The per square metre rate is a reliable anchor but the precise home extension cost for your MK property depends on what the build actually involves. Size specification existing ground conditions and your chosen finishes all feed into the final number. A free site visit is the only way to give you a figure you can actually plan around.
We work across the full Milton Keynes area — Bletchley Westcroft Crownhill Loughton Oldbrook Wolverton Newport Pagnell Wavendon Gate and the villages beyond. Get in touch today to arrange a free no-obligation visit. Find out more about how we run our projects or take a look at what we have built across MK — the finish speaks for itself.