House extensions in Market Harborough
Single and double storey extensions in Market Harborough, with the planning route and building control sorted first.
A single storey extension in Market Harborough typically costs £2,400–£3,200 per m² finished ready for decoration, roughly £29,000–£38,500 for a 12m² rear extension, with any kitchen fit-out priced separately. Building control in Market Harborough is Leicestershire Building Control Partnership (LBCP): £793.09 for a 10–50m² extension.
- Typical cost
- £2,400–£3,200 per m²
- Building control
- LBCP: garage conversion £517.96, extension 10–50m² £793.09
- Planning advice
- Harborough District Council: £101
- Time on site
- Several weeks
Our 2026 guide prices, all in. Your fixed price comes in writing after the site visit. Council fees checked October 2026.
What house extensions in Market Harborough usually involve
Extending is the most cost-effective way to gain space and value without leaving a town you like. We design and build single and double storey extensions, kitchen and dining extensions and rear and side returns across Market Harborough and the surrounding Leicestershire villages — matched to everything from red-brick Victorian terraces near the centre to modern estate homes on the edges. Every build meets Building Regulations and is signed off through Local Authority Building Control, with the planning or permitted-development route confirmed before we start.
The extensions Market Harborough homes ask for most
Market Harborough's housing runs across every era, and the right extension depends on the age and style of the property.
Period brick homes near the town centre and in the conservation area need extensions in matched brick with sympathetic detailing and appropriate roofing. Planning permission is usually required here, and we prepare the work to the standard a conservation officer expects.
Victorian and Edwardian houses often suit a rear or side-return extension to open a cramped kitchen into a single bright family space — typically removing a load-bearing wall and installing a steel beam to a structural engineer's calculations, which we do as standard.
Modern estate homes around the edges of Market Harborough frequently allow rear extensions under permitted development, avoiding a full planning application. We confirm the route at the first visit so there are no surprises.
What Building Regulations cover
Every extension must meet Building Regulations regardless of planning: foundations sized for the ground, a damp proof course tied into the existing wall, insulation to current standards, structural support over openings, fire safety, ventilation and drainage. We build to those standards and arrange Building Control inspections at foundations, damp proofing, structure and completion — so you receive the completion certificate a buyer's solicitor will later want.
Market Harborough & villages we cover
We cover Market Harborough and the surrounding villages including Great Bowden, Little Bowden, Lubenham, Foxton, Kibworth, Husbands Bosworth and Great Glen.
Design & approvals
We help with drawings, structural calculations, the planning or permitted-development route and the Building Control application.
Build & structure
Foundations, matched brickwork, steel beams, roofing and weathering — inspected at each stage.
Thinking about extending in Market Harborough?
We will visit, talk through what's possible, check the planning position and quote in writing — all free and without pressure.
Ground, drainage and conservation in Market Harborough
Market Harborough is on Jurassic mudstones and clays, which drain slowly, and the town sits where the River Welland meets the River Jordan. Water management decides most designs here, so we test the ground before choosing a soakaway or a permeable build-up.
The Market Harborough conservation area covers the historic town core and was designated in 1969, with separate conservation areas at Great Bowden and Lubenham. An Article 4 direction served in 2020 on land at Queen's Street, Little Bowden, covers gates, fences and walls.
The town centre flooded from surface water in September 2024, when a high River Welland stopped the drains discharging, and more than 50 properties flooded in July 2013. Permeable surfaces and attenuation are worth taking seriously here. You can check any address on the Environment Agency flood map.
Sources: Market Harborough flood report, Sept 2024 · Market Harborough conservation area.
Permissions and fees in Market Harborough
- Planning routeMany single storey rear extensions are permitted development; a householder application costs £548 and a lawful development certificate £274 (national fees from April 2026). Planning Portal guidance
- Pre-application adviceIf anything is unclear, Harborough District Council gives householder pre-application advice for £101. Pre-application advice
- Building regulationsLeicestershire Building Control Partnership (LBCP): £793.09 for a 10–50m² extension. Building control fees
- Sewers and neighboursIf a public sewer runs within 3m, you need a build-over agreement with Anglian Water. Anglian Water: building over or near sewers
- BuildOne fixed written price, then the build, inspections and the completion certificate.
Council fees and rules checked October 2026. Planning fees are the national fees from 1 April 2026.
What you get
- Planning or permitted development route confirmed before anything starts
- Structural calculations and building regulations drawings arranged
- Stone or brick matched to the house
- Build-over agreements with Anglian Water where a sewer runs close
The specification
- Drawings, calculations and approvals
- Foundations inspected by building control
- Blockwork, insulation and the outer skin in matching stone or brick
- Roof, windows and doors
- First and second fix, plastering
- Completion certificate from building control
Rated 5.0 from 37 Google reviews
“Excellent Porch Extension by Lewis and the Team We recently had a porch extension completed by Lewis and his team, and we are extremely pleased with the result. From start to finish, Lewis was professional, reliable, and easy to communicate with. …”
Deepak · Porch extension — Google review
“These guys fitted our job in at short notice, did a great job despite the harsh weather. We had great communication throughout the project as it was not quite as simple as we first thought. We definitely recommend them and will be using them for future projects”
John — Google review
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House extensions in Market Harborough: questions
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Request a site visit in Market Harborough
We measure up, check levels and drainage, and send a written proposal with the build-up, the programme and one whole price. No pressure and no follow-up sales calls.