The 10 extension builders from Google's results for Northampton, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
on GoogleWeston Favell, Northampton
Operating in Weston Favell and Northampton, Smart Build constructs single-storey kitchen extensions and open-plan living spaces. The firm alters existing layouts and replaces conservatories with solid home additions.
01604 622608 1 Greenway, Weston Favell, Northampton NN3 3BW
on GoogleNorthampton
Swiss Build constructs high-end house extensions and structural home expansions for clients in Northamptonshire. The company manages residential building projects designed to increase living space and modernise traditional layouts.
01604 288123 Unit 7 Stafford Pl, Northampton NN3 6NN
on GoogleNorthampton
DH & Sons builds custom home extensions across Northampton, covering areas such as Abington and Duston. The company oversees full project management for property additions alongside general landscaping and driveway work.
on GoogleBedford
Dynamic Construction builds house extensions across Northamptonshire. The Bedford firm carries out projects to create larger kitchens, extra bedrooms, and home offices.
01234 352853 49 Brunel Rd, Bedford MK41 9TJ
on GoogleLedburn, Leighton Buzzard
Aspire Extensions manufactures and fits home additions for period and contemporary properties across Northampton and nearby towns. The company constructs living spaces designed for year-round use to increase residential layout options.
01908 886280 Bridge Farm, Ledburn, Leighton Buzzard LU7 0QD
on GoogleNorthampton
A Spencer carries out house extensions, loft conversions, garage conversions, and new builds in Northamptonshire. Additional services include structural knock-throughs, kitchen renovations, and warm roof installations for local properties.
on GoogleBarn Way, Est
Highfields Property Services undertakes house extensions, window and door fitting, and kitchen installations. Located in Barn Way, Est, the business also supplies and lays flooring and paving for residential projects.
01604 581111 Unit 4, Barn Way, Est NN5 7UW
on GoogleOrion Way, Kettering
Based in Kettering, House Extensions Milton Keynes provides extension building alongside window and door fitting services.
01933 677444 Unit 1, Pytchley Business Park, Orion Way, Kettering NN15 6NP
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Northampton
Home Convert Ers constructs single and double-storey house extensions across Northamptonshire. The Northampton firm handles projects from initial design and architect liaison through to final interior decorating.
Northampton
Lee Swingler provides general building services throughout Northampton, with a focus on brick and stone construction. The team undertakes house builds, extensions, and structural works for domestic clients.
In Northampton, single storey, per m² typically costs £1,800 – £2,500. Labour in Northamptonshire runs 1% below the UK median, which accounts for most of the difference from the same job elsewhere.
These are the firms from Google's results for "house extensions northampton". They are ranked on Google rating, online presence and other factors.
The figures above are Northampton ranges. These explain what drives them, so you can read a quote properly.
Per-square-metre prices for single-storey, two-storey, side return and kitchen extensions, costs by size, the fees outside the build price, and planning limits by nation.
The permitted development limits for extensions, lofts, porches and outbuildings in England, where the rights do not apply, what prior approval and a certificate cost, and how Wales, Scotland and NI differ.
When the Party Wall Act applies, which notice to serve and how far ahead, what your neighbour can do, what a surveyor's award costs, and the rules in Scotland and NI.
Under permitted development, three metres for a terrace or semi and four for a detached, doubled to six and eight under the prior approval process. Height, materials and how much garden you cover all carry separate limits, and none of it applies in a conservation area.
If you are excavating within three metres of a neighbour's foundations or building on the boundary, yes. You must serve notice two months before work starts. Skipping it is the most common reason extension projects stall.