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From first sketch to the last coat of paint, one local team
House Extensions In Northampton
Trackrecord Construction designs and builds house extensions across Northampton, covering everything from the first drawings through to a finished, decorated room. Whether you want a single storey rear extension, a side return, or a full wraparound, the same in-house team handles the design, the structural work and every trade needed to finish it. We'll tell you honestly which type of extension actually suits your property and your budget before any design work starts.
Rear, Side Or Wraparound: What Fits Your Plot
A single storey rear extension usually opens a kitchen or living space into the garden and works well behind most Northampton semis and detached houses. A side return suits the narrow strip of land many Victorian terraces in areas like Abington and Weston Favell have running down one side of the house, land that's often wasted as access rather than living space. Combining both into a wraparound gives the largest ground floor gain where the plot allows it. Double storey extensions cost less per square metre than single storey, since the foundations and roof are shared across two floors, though more of the new structure has to tie into the existing house.
A Build That Evolves With You, Not A Fixed Script
Nathan Howard has spent over 30 years across the trades that go into an extension, carpentry, glazing, conservatories and full-scale renovations, so he's usually already worked through the problem your extension will hit before it happens on site. Our own electricians, plumbers and plasterers finish what our own groundworkers and carpenters build, and Nathan stays involved throughout rather than handing the project to someone else once contracts are signed. We treat the drawings as a starting point rather than a fixed script, since plans change once you can see the space taking shape, and the build evolves as a result.
Why Northampton's Ground Needs Checking Before You Dig
Northampton sits across the Northampton Sand Ironstone belt, ground that mixes clay prone to shrinking and swelling with the seasons and, in places, old ironstone workings that left disturbed ground beneath what now looks like an ordinary garden. Get foundation depth wrong on ground like this and the result is cracking or uneven settlement a few years later, not on day one. We check ground conditions on-site before quoting, so the foundation design in your price reflects what's actually under your garden rather than a generic figure revised once digging starts.
What Northampton Homeowners Can Build Without Full Planning Permission
Many single storey rear extensions can go ahead under permitted development, meaning no planning application is needed. As of 2026, the standard limit is 3 metres beyond the original rear wall for a semi-detached or terraced house or 4 metres for a detached house, with a maximum height of 4 metres. Go beyond that and the Larger Home Extension scheme can often still avoid a full application, allowing up to 6 metres (semi-detached or terraced) or 8 metres (detached), provided your neighbours are formally consulted first. That changes in conservation areas, for listed buildings, and anywhere an Article 4 Direction has removed permitted development rights, which applies in parts of Northampton's town centre. We check your specific address before assuming either way and manage a full planning application on your behalf where one's needed.
From First Enquiry To Finished Room
Once work starts on site, a single storey extension typically takes 8 to 16 weeks to build, depending on size and how much groundwork the site needs. A double storey extension usually runs longer, since there's more structure to put up and more internal fit-out to complete. Add design, structural engineering and any planning time beforehand and most projects run from first enquiry to finished room somewhere between 4 and 9 months. We'll give you a realistic timeline for your specific project once we've seen the site, not a generic figure that changes once work is underway.
What Determines Your Extension's Price
Size, structural complexity, ground conditions and finish specification all move the price, so a figure that applies to one extension rarely applies to another. Our own jobs typically range from a few thousand pounds for smaller works up to £250,000 for larger structural projects, and we'll only quote once we've seen the site. Finance options are available if the scope you want doesn't match what's sitting in the bank right now. If a SIP panel build suits your plot better than a traditional extension, our SIP panel building in Northampton page covers how that compares. If what you actually need is a different layout rather than more space, our home renovations page covers that side of the job instead.
Arrange A Site Visit For Your Extension
