Building services in Washington
House extensions
- Single-storey extensions
- Double-storey extensions
- Side extensions
- Side return extensions
- Wraparound extensions
- Kitchen extensions
- Orangeries
- Glazed and contemporary extensions
- Porches
Loft conversions
- Dormer loft conversions
- Hip-to-gable loft conversions
- Mansard loft conversions
- Rooflight loft conversions
- Bungalow loft conversions
Garage, basement and barn conversions
New build homes
Renovations and structural work
Design and approvals
Guide prices in Washington
| Project | Guide range (inc VAT) |
|---|---|
| Double-storey extensions | £1,500–£2,250 per m² of floor area (both floors) |
| Dormer loft conversions | £43,000–£61,000 for a typical rear dormer with en-suite |
| Hip-to-gable loft conversions | £49,500–£70,000 for a hip-to-gable with rear dormer |
| Garage conversions | £16,000–£27,000 for a single integral garage |
| Structural alterations and knock-throughs | £4,000–£8,500 for a typical knock-through with steel beam |
| Orangeries | £2,150–£3,050 per m² of floor area |
The guide for Washington reflects typical costs in the North East, roughly 10% below the UK-wide figure.
Planning permission in Washington
In England a single-storey rear extension is often permitted development: broadly up to 3 metres deep on a semi-detached or terraced house and 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres within 2 metres of a boundary, and covering no more than half the garden. The larger home extension scheme allows up to 6 or 8 metres if you notify the council first and neighbours have a chance to comment. In conservation areas, National Parks and National Landscapes the larger home extension route, side extensions and cladding are not permitted development. Flats and houses whose rights have been removed need a planning application, and listed buildings need listed building consent.
Building regulations approval comes from the council’s building control service or a registered building control approver. The work is inspected at key stages, such as foundations, drainage and insulation, and a completion certificate is issued at the end.
About building in Washington
The North East has many terraced streets and post-war semis, where rear extensions and loft conversions are popular ways to gain space.
If your home is in Washington or close by in Chester-le-Street, Houghton-Le-Spring and Hebburn, a free home visit is the first step. Washington has a population of around 67,000.
How it works
- 01
Visit and measured survey
A free visit to understand the project, check access and take measurements.
- 02
Design and fixed quote
Drawings, structural calculations and an itemised, fixed price for the agreed specification.
- 03
Approvals
Planning or permitted development confirmation, building regulations and any party wall matters.
- 04
Build and sign-off
We run the build to a written programme and hand over the completion certificate.
Questions from homeowners in Washington
Do you work in Washington?
Yes. We take on extensions, loft conversions, conversions, renovations and new builds across Washington, including postcodes NE37 and NE38.
How much does a loft conversion cost in Washington?
A rear dormer loft conversion in Washington typically costs £43,000–£61,000 for a typical rear dormer with en-suite, including VAT.
Is the home visit free?
Yes. The first visit to discuss your project and measure up for a quote is free, with no obligation.
How much does an extension cost in Washington?
A single-storey extension in Washington typically costs £1,750–£2,600 per m² of floor area, and a double-storey extension £1,500–£2,250 per m² of floor area (both floors), including VAT.
Do I need planning permission for an extension in Washington?
In England a single-storey rear extension is often permitted development: broadly up to 3 metres deep on a semi-detached or terraced house and 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres within 2 metres of a boundary, and covering no more than half the garden. The larger home extension scheme allows up to 6 or 8 metres if you notify the council first and neighbours have a chance to comment. In conservation areas, National Parks and National Landscapes the larger home extension route, side extensions and cladding are not permitted development. Flats and houses whose rights have been removed need a planning application, and listed buildings need listed building consent.