Side extensions for homes in Northallerton
From the first sketch to final sign-off, we plan and build side extensions in Northallerton and the surrounding North Yorkshire area.
- Guide price in NorthallertonFrom £20,500 inc VAT
- PlanningSingle storey can be permitted development
- Build time10–18 weeks on site
- Postcode districtsDL7
What we take care of
- New openings through the side wall
- Survey, design and street-view drawings
- Windows, doors and finishes to match
- Planning route checked or application made
- Foundations near boundaries and any drains
- Structure, roof tied into the house
Working in Northallerton
Site visits are available across Northallerton (DL7). We also work in nearby Ripon (13 miles), Middlesbrough (19 miles), Harrogate (24 miles), Redcar (26 miles).
For homes towards County Durham, Yarm is around 13 miles away. Homes across Yorkshire and the Humber range from back-to-back and through terraces to large suburban semis, and extension options vary with them.
Side extension prices in Northallerton
These guide figures apply our Yorkshire and the Humber adjustment (×0.94) to national rates. They include VAT at 20% and cover the build itself; design and council fees are listed separately.
Typical rates in Northallerton: £1,640 to £3,200 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| 2.5 m × 5 m 12 m² | £20,500 – £25,000 | £23,000 – £30,000 | £29,000 – £38,500 |
| 3 m × 6 m 18 m² | £29,500 – £36,000 | £34,500 – £45,000 | £43,500 – £58,000 |
| 3 m × 8 m 24 m² | £39,000 – £47,500 | £46,000 – £60,000 | £58,500 – £77,000 |
Try the guide-price tool to see a range for your own size and finish.
Planning rules that apply in Northallerton
In England a single-storey side extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house. Two-storey side extensions, and any side extension on designated land such as a conservation area, need a householder planning application.
The planning position for a specific Northallerton address depends on its history and any designations, which is why we check it at the first visit.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Building over or within 3 m of a public sewer needs the water company's consent, usually through a build-over agreement, before the foundations go in.
Applications are decided by the local planning authority (your district, borough or unitary council).
How the project works
Site visits are free and there is no obligation. Where drawings are needed, the design stage is priced in writing before it starts.
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Common questions in Northallerton
Who do I contract with for a side extension in Northallerton?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
Can I see a price before committing to anything?
Yes. The guide prices on this page are adjusted for Northallerton, and the guide-price tool gives a range for your own size. After the survey you get a written price before anything is agreed.
How long does a side extension take to build in Northallerton?
On site, typically 10 to 18 weeks once approvals are in place. Before that, allow 6–14 weeks design and approvals.
Can I build over my driveway?
Yes, if the foundations work and you keep any parking the council requires. Drains and services under drives are common, so we check before design.
How much does a side extension cost?
Our guide range is about £1,640 to £3,200 per m² including VAT, depending on specification, so a standard 18 m² single-storey side extension lands around £34,500 to £45,000 in Northallerton.
Book a free site visit in Northallerton
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.