Two-storey extensions in County Durham
Two-storey extensions in County Durham: guide prices for North East England, the rules that apply in England, and the towns we cover.
County Durham at a glance
- Nation
- England
- Price region
- North East England
- Postcode areas
- DH, DL, SR, TS
- Main town
- Darlington
- Towns listed
- 19
- Site visits
- Free, no obligation
Choose your town
- Darlington
- Hartlepool
- Stockton-on-Tees
- Durham
- Chester-le-Street
- Billingham
- Stanley
- Consett
- Newton Aycliffe
- Bishop Auckland
- Seaham
- Thornaby-on-Tees
- Peterlee
- Yarm
- Spennymoor
- Annfield Plain
- Shildon
- Ferryhill
- Brandon
Guide prices in North East England
| Extension type | Per m² | Typical project |
|---|---|---|
| Two-storey rear extension | £1,800–£2,430 per m² | £50,500–£68,000 |
| Two-storey side extension | £1,840–£2,480 per m² | £77,500–£104,000 |
| Two-storey wraparound extension | £1,940–£2,660 per m² | £108,500–£148,500 |
| Part single, part two-storey | £1,800–£2,480 per m² | £65,000–£89,000 |
| Extension over a garage | £1,580–£2,300 per m² | £28,500–£41,500 |
| First-floor extension over an existing single storey | £1,620–£2,340 per m² | £22,500–£33,000 |
| Two-storey front extension | £1,980–£2,700 per m² | £24,000–£32,500 |
Including VAT, Standard spec. See all prices and fees.
Across County Durham we cover Darlington (DL1), Hartlepool (TS24), Stockton-on-Tees (TS18), Durham (DH1), Chester-le-Street (DH2), Billingham (TS20), Stanley (DH9) and Consett (DH8), plus the smaller places around them.
Which type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in County Durham, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
The rules in England
County Durham is in England. Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission. Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
The full England rules explained
Extension types
- Two-storey rear extensions
- Two-storey side extensions
- Two-storey wraparound extensions
- Part single, part two-storey extensions
- Extensions over a garage
- First-floor extensions
- Two-storey front extensions
By house type
- Two-storey extensions for semi-detached houses
- Two-storey extensions for detached houses
- Two-storey extensions for end-of-terrace houses
Rooms and uses
- Kitchen extensions with bedrooms above
- Extra bedroom and en-suite extensions
- Two-storey annexe extensions
- Garage conversions with a room above
Design and approvals
- Two-storey extension plans and drawings
- Planning permission for two-storey extensions
- Structural engineering for two-storey extensions
- Building regulations for two-storey extensions
- Party wall notices for extensions
- Design and build two-storey extensions
Questions about extensions in County Durham
How much does a two-storey extension cost in County Durham?
In North East England our guide for a two-storey rear extension is £1,800–£2,430 per m² including VAT, about £50,500–£68,000 for a 4 m × 3.5 m footprint on two floors (28 m² of new floor space). Side and wraparound extensions cost a little more per m².
Do I need planning permission in County Durham?
Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission. Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026).
Do you cover the whole of County Durham?
Yes. We list the main towns here, but we cover the whole of County Durham including villages. The first site visit is free.
What happens at the first visit?
We look at your house, the boundaries, access and drains, talk through what you need and explain the approvals. Then we price the design stage, including the measured survey, in writing.