Home Extension Builders in Milton Keynes

Milton Keynes is unlike any other city in the UK. It was planned from scratch in the late 1960s and built out grid square by grid square over the following three decades — which means the housing stock spans a wider range of eras styles and construction methods than almost anywhere else in England. A builder who knows MK understands that extending a Victorian terrace in Wolverton is a fundamentally different project to extending a 1990s detached home in Westcroft or a 2000s new-build in Oakgrove. We know all of them.

Crownhill Building Services has completed more home extension projects across Milton Keynes than we can count. The ground conditions across different parts of MK. The planning requirements for different property types. The brickwork specifications that match different decades of construction. This is local knowledge that only comes from twenty years of working in the same city.

Home Extensions Across Every Part of Milton Keynes

We cover every grid square and every surrounding area within MK. From Bletchley and Fenny Stratford in the south to Great Linford and New Bradwell in the north. From Stony Stratford and Wolverton in the west to Broughton and Oakgrove in the east. Wherever your property sits within Milton Keynes we have almost certainly worked in that street or the streets around it.

Browse our full portfolio of completed extensions across Milton Keynes to see the range of work we deliver — from luxury rear extensions in Westcroft to double storey front extensions in Newport Pagnell.

Types of Home Extension We Build in Milton Keynes

Single storey rear extensions are the most popular project across MK — opening up the ground floor to create connected kitchen and dining spaces that change how a house functions day to day. Most fall within Permitted Development and require no planning application.

Double storey extensions add bedroom and bathroom space at first floor level alongside extended ground floor living areas. They almost always require a full planning application to Milton Keynes City Council — we manage that process from drawings to decision as part of the project.

Kitchen extensions combine the rear extension with a new kitchen installation — managing both elements under one contract with one point of contact throughout. No separate bills for a builder and a kitchen fitter. One fixed price from the outset.

Planning Rules Across Milton Keynes

Milton Keynes City Council handles planning for the city itself, but the rules that matter most to a homeowner are national. Under Permitted Development a detached house can usually add a 4 metre rear extension without an application and a semi-detached or terraced house 3 metres, provided height and side-width limits are met. The exceptions are the conservation areas, chiefly Wolverton, Stony Stratford, Newport Pagnell and the old villages such as Woughton on the Green, and some of the newest estates where the developer's consent removed those rights. Because MK is so varied, we always check the specific address before giving advice. Our article on whether you need planning permission in Milton Keynes goes into the detail.

Pricing and Timescales

Every extension is quoted after a site visit and the price is fixed in writing before we start. For a sense of what drives the figure, read our single storey extension cost guide and the double storey costs and planning guide. A single storey project built under Permitted Development typically runs ten to fourteen weeks from first call to completion certificate, and a double storey scheme that needs planning adds the council's determination period on top. The full breakdown is in how long a house extension takes in Milton Keynes.

Talk to Us

Wherever you are in Milton Keynes, the first step is the same: a free site visit, a straight answer on what you can build, and a written price if you want to go further. Contact us to book one, or browse the extension specialists hub to see how we approach each type of project.