Extensions over a garage across Northallerton
Thinking about an over-garage extension for your Northallerton home? Start with a free site visit: we measure up, check what the council will allow and give you honest guide figures on the day.
- Guide price in NorthallertonFrom £22,500 inc VAT
- PlanningHouseholder application needed
- Build time12–18 weeks on site
- Postcode districtsDL7
Included in a typical project
- Opening into the existing first floor
- Design and householder planning application
- Strengthening or rebuilding the garage walls if needed
- Structural survey of garage walls and foundations
- New floor structure, walls and roof
- Insulation, electrics, heating and finish
Planning rules that apply in Northallerton
In England any side extension over one storey, including a room built over a side garage, needs a householder planning application. The fee is £548 from 1 April 2026 and councils aim to decide within 8 weeks.
Before any drawing is finalised we check whether the house is listed, in a conservation area or subject to an Article 4 direction.
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.
Applications are decided by the local planning authority (your district, borough or unitary council).
Over-garage extension prices in Northallerton
Prices below are for Northallerton, using the Yorkshire and the Humber factor of ×0.94. They are guide ranges including VAT for the build only, not a quote.
Typical rates in Northallerton: £1,690 to £3,200 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| Over a single garage 12 m² | £22,500 – £28,000 | £23,500 – £30,500 | £30,000 – £38,500 |
| Over a large single garage 16 m² | £27,000 – £33,500 | £31,500 – £41,000 | £40,500 – £51,500 |
| Over a double garage 24 m² | £40,500 – £50,000 | £47,000 – £61,000 | £60,500 – £77,000 |
Want a range for your exact size? The guide-price tool takes about a minute.
Local to Northallerton
Postcode districts we cover around Northallerton include 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.
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
We visit your Northallerton home, measure up, talk through what you want and check the planning position.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
Build and sign-off
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Your questions about an over-garage extension in Northallerton
Will my neighbours in Northallerton be involved?
If a planning application or prior approval is needed, the council notifies neighbours. If the work is on or near a shared boundary, party wall notices may also be needed.
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 an over-garage extension take to build in Northallerton?
On site, typically 12 to 18 weeks once approvals are in place. Before that, allow 8–14 weeks design and approvals.
Does building over a garage need planning permission?
In England and the rest of the UK, adding a storey over a side garage almost always needs a planning application, because two-storey side extensions are outside permitted development.
Can I keep using the garage during the build?
Usually not for parking. The garage roof is removed and the space below is used for access and props for part of the build.
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.