Yarm, North Yorkshire
Semi-detached rear extension in Yarm
We plan and build rear extensions for semi-detached houses for homeowners in Yarm. Single or two-storey extensions for semi-detached houses, with side access and one party wall. Start with a free site visit, then a written price once the design is agreed.
Yarm is covered from our North Yorkshire round, including TS15, TS16 and TS17. Where a Yarm semi already has a small lean-to at the back, we usually replace it rather than extend it.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a semi-detached rear extension cost in Yarm?
In Yarm, our guide for a semi-detached rear extension is £1,710–£2,790 per square metre including VAT for a standard specification. North East prices are among the lowest in our range; former mining ground is the main foundation variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £20,500–£33,500 |
| 4 m wide × 5 m deep (20 m²) | £34,000–£56,000 |
| 4 m wide × 6 m deep (24 m²) | £41,000–£67,000 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a semi-detached rear extension in Yarm?
Planning for a semi-detached rear extension in Yarm follows the English householder rules.
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.
What are homes in Yarm like to extend?
Brick terraces, colliery houses and post-war semis make up much of Yarm. Former mining areas often need a coal mining risk check before foundations are designed.
How a semi-detached rear extension in Yarm comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Semi-detached rear extensions near Yarm
From Yarm, the nearest places we also cover are Ingleby Barwick (2.2 miles) and Thornaby-on-Tees (3.1 miles).
- Semi-detached rear extension in Ingleby Barwick
- Semi-detached rear extension in Thornaby-on-Tees
- Semi-detached rear extension in Stockton-on-Tees
- Semi-detached rear extension in Billingham
- Semi-detached rear extension in Middlesbrough
Other work in Yarm:
FAQ
Semi-detached rear extension questions in Yarm
Do I need planning permission for a rear extension in Yarm?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
What postcode areas do you cover around Yarm?
Including TS15, TS16 and TS17, and the surrounding North Yorkshire area.
What if my neighbour has already extended?
That can make a matching depth easier to justify. We measure theirs at the survey.
Can you match the brick or stone on my Yarm house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
How much does a semi-detached rear extension cost in Yarm?
As a guide, £1,710–£2,790 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £20,500–£33,500 at that rate. Your written price follows the survey.
Do you handle building control in Yarm?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.