Based in Buckingham
A Buckingham Extension Builder a Few Minutes From Your Door
Extending a home in Buckingham often means working around a Georgian street front, a listed neighbour, or a garden that runs down towards the River Great Ouse. Cognitive Construction is based on Little Balmer in Buckingham, so we know these constraints well.
We design and build house extensions in Buckingham and the surrounding villages, handling planning, heritage and building control as one fixed-price project with our own team. See the full range on our house extension service page.
How It Works
How We Take a Buckingham Extension From First Visit to Handover
STEP ONE
Visit and Brief
We survey your home and check planning history, heritage status and flood risk before anything is drawn.
STEP TWO
Design and Drawings
Drawings from our design and build team, prepared to planning and Building Regulations standards, with structural engineering coordinated by us.
STEP THREE
Itemised Fixed-Price Quote
Every element priced from measured quantities. The figure we quote is the figure you pay, unless you change the scope.
STEP FOUR
Planning, Heritage and Approvals
We submit the application to Buckinghamshire Council with any Heritage Statement or flood risk assessment, and manage it to a decision.
STEP FIVE
The Build
Our own team on site. Single-storey extensions take 10 to 16 weeks, double-storey work 16 to 24 weeks.
STEP SIX
Handover
A final snagging walk-round and the building control completion certificate. Most extensions take 6 to 12 months from first conversation to completion.
Local Knowledge
What Should You Know Before Extending a Home in Buckingham?
Homes in the Conservation Area
Much of the historic centre was rebuilt in brick after the fire of 1725. In April 2026 Buckinghamshire Council expanded the conservation area, so check whether your home is now inside it.
What Changes Inside the Boundary
Side extensions, two-storey rear extensions and new cladding need planning permission, and the council expects a Heritage Statement, which we prepare with the drawings.
Listed Buildings
The conservation area holds more than 190 designated heritage assets. A listed home needs listed building consent as well as planning permission before work starts.
Homes Near the River Great Ouse
In Flood Zone 2 or 3 an extension needs a flood risk assessment, usually with floor levels at least 600 mm above the estimated flood level.
Newer Developments
Permitted development rights are sometimes removed by a planning condition, so we check the original consent before design begins.
Village Homes
In Maids Moreton, Padbury, Gawcott and the Lillingstones, extensions often need to match local stone, and clay ground can affect foundations and drainage.
Pricing and Budgets
How Much Does a House Extension Cost in Buckingham?
Our current pricing puts most single-storey extensions at £1,800 to £2,800 per square metre for the build itself. Professional fees, VAT and any work to the existing structure are priced separately, and every figure depends on a site survey.
Your quote is itemised and fixed before you commit, with no hidden extras.
Single-storey extension
£1,800 to £2,800 per m²
Build cost per square metre, before fees and VAT.
Heritage materials
Itemised
Handmade bricks, limestone and clay tiles to match a period home cost more than standard stock.
Supporting reports
Confirmed upfront
A Heritage Statement or flood risk assessment adds fees and time at the planning stage.
| Scope | What it covers | Indicative figure |
|---|---|---|
| Single-storey extension | Build cost per square metre, before fees and VAT | £1,800 to £2,800 per m² |
| Heritage materials | Handmade bricks, limestone and clay tiles to match a period home cost more than standard stock | Added to the itemised quote |
| Supporting reports | A Heritage Statement or flood risk assessment adds fees and time at the planning stage | Confirmed before you commit |
Why Local Matters
Why Choose a Buckingham-Based Extension Builder?
Choosing extension builders close to home makes a practical difference once work starts.
- Short travel times. Our office is a few minutes from most of the town, so visits and snagging are easy to arrange.
- Local materials knowledge. Red brick in Flemish bond, pale limestone and handmade clay tiles, and how to match them.
- Directly employed trades. The people building your extension work for us.
- Accredited and accountable. Vetted by the Federation of Master Builders, with our 10 Point Guarantee on every project.
In-House Extension Builders
Why Homeowners in Buckingham Choose Cognitive Construction
We’re a Federation of Master Builders member working from Whiteleaf Business Centre on Little Balmer. The people who quote your extension are the people who build it.
- Every trade in-house: groundworks, brickwork and stonework, carpentry, plumbing and electrics
- Fixed-price contracts: itemised, and fixed before work starts
- Heritage and planning experience: conservation area applications and listed building consent
- Flood-aware design: floor levels and drainage planned for homes near the Great Ouse
- One point of contact from first visit to handover
Common Questions
Buckingham Extension FAQs
Service Areas
Areas We Cover Around Buckingham
From our base in MK18, we build extensions across every part of the town and the nearby villages, including:
- Buckingham town centre
- Maids Moreton and Akeley
- Gawcott and Tingewick
- Padbury and Thornborough
- Lillingstone Lovell and Lillingstone Dayrell
- Steeple Claydon
- Winslow
- Stowe and Chackmore
- Nash and Whaddon
- Great Horwood
Get In Touch
Talk to a Local Extension Builder in Buckingham
Whether it’s a single-storey kitchen extension or a two-storey addition to a period home, we’ll visit, look at what your property allows and give you a realistic view of cost and timescale.
