England
Rear extensions in Northumberland
We design and build rear extensions across Northumberland, from Blyth and Cramlington to Ashington, covering single-storey kitchen extensions, two-storey additions, side returns and wraparounds.
What are homes in Northumberland like to extend?
Brick terraces, colliery houses and post-war semis make up much of Northumberland. Former mining areas often need a coal mining risk check before foundations are designed.
Rear extension prices in Northumberland
North East prices are among the lowest in our range; former mining ground is the main foundation variable. Per square metre including VAT, standard specification:
| Extension | Per m² |
|---|---|
| Single-storey rear extension | £1,710–£2,790 |
| Two-storey (per m² across both floors) | £1,620–£2,430 |
| Side return | £2,070–£3,420 |
| Wraparound | £1,980–£3,240 |
| Glass-led | £2,520–£4,320 |
Planning and building rules in Northumberland
In England a single-storey rear extension can often be built under permitted development: up to 3 metres beyond the original rear wall of an attached house, or 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres if any part is within 2 metres of a boundary.
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.
Planning and Building Regulations are separate in England: even a permitted development extension is inspected for foundations, drainage, structure, insulation, fire safety and ventilation, through the council or a registered building control approver, ending with a completion certificate.
Because rear extensions often sit on or near the boundary, the Party Wall etc. Act 1996 usually applies in England. Notices go out one or two months before work depending on the type of work, and a surveyor's award is only needed if a neighbour does not consent.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent.
Rear extensions we build in Northumberland
- Larger home extension prior approval (England)
- Rear extension plans and planning applications
- Building Regulations for rear extensions
- Single-storey rear extensions
- Two-storey rear extensions
- Kitchen-diner rear extensions
- Side return extensions
- Wraparound extensions
- Glazed and glass-box rear extensions
- Rear extensions for terraced houses
- Rear extensions for semi-detached houses
- Rear extensions for detached houses
- Rear extensions for bungalows
- Flat-roof rear extensions
- Pitched and lean-to roof rear extensions
- Knocking through to a rear extension
- Roof lanterns and rooflights for rear extensions
- Permitted development rear extensions
Towns and districts in Northumberland
The main places we cover in Northumberland include Blyth, Cramlington and Ashington, across postcode areas NE and TD.
| Town | Postcode districts | Nearest town we also cover |
|---|---|---|
| Blyth | NE23, NE24 | Bedlington (3.4 miles) |
| Cramlington | NE22, NE23, NE24 | Bedlington (3.1 miles) |
| Ashington | NE62, NE63, NE64 | Bedlington (3.4 miles) |
| Bedlington | NE22, NE24, NE62 | Cramlington (3.1 miles) |
| Darras Hall | NE18, NE20 | Ponteland (1.3 miles) |
| Morpeth | NE61 | Bedlington (4.6 miles) |
| Prudhoe | NE42 | Newburn (4.6 miles) |
| Berwick-upon-Tweed | TD15 | Kelso (20.4 miles) |
| Hexham | NE46 | Prudhoe (10.0 miles) |
| Ponteland | NE20 | Darras Hall (1.3 miles) |
Areas near Northumberland
FAQ
Questions people ask
How much does a rear extension cost in Northumberland?
As a guide, £1,710–£2,790 per square metre including VAT for a standard single-storey extension at North East England rates.
Do I need planning permission in Northumberland?
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.
Which towns in Northumberland do you cover?
10 towns and districts, including Blyth, Cramlington and Ashington.
Do you handle building control?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.