Two-storey extensions in Darlington
We design, get approval for and build two-storey extensions in Darlington and the surrounding area. Choose the type of extension below or book a free site visit.
Darlington at a glance
- Postcode districts
- DL1, DL2 and DL3
- Area
- County Durham, England
- Price region
- North East England
- Nearest towns
- Newton Aycliffe (6.6 miles), Yarm (7.9 miles), Shildon (8.2 miles), Stockton-on-Tees (9.8 miles)
- Approvals
- Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission.
We cover postcode districts DL1, DL2 and DL3 in and around Darlington, along with neighbouring Newton Aycliffe, Yarm and Shildon.
Extensions available in Darlington
Two-storey rear extensions
Our North East England guide starts at £50,500 for this type.
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Two-storey side extensions
Design, approvals and build for Darlington homes. Guide from £77,500.
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Two-storey wraparound extensions
Design, approvals and build for Darlington homes. Guide from £108,500.
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Part single, part two-storey extensions
Our North East England guide starts at £65,000 for this type.
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Extensions over a garage
From £28,500 in Darlington. Free visit to firm it up.
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First-floor extensions
For homes in Darlington: typical guide from £22,500.
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Two-storey extensions for semi-detached houses
Our North East England guide starts at £50,500 for this type.
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Two-storey extensions for detached houses
Our North East England guide starts at £77,500 for this type.
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Kitchen extensions with bedrooms above
Our North East England guide starts at £50,500 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
For homes in Darlington: typical guide from £50,500 (plus en-suite).
Learn moreWhich type suits your house?
Rear and side extensions suit most semi-detached and detached houses with room around them. Terraced and town-centre homes can take a two-storey extension too, with more care over neighbours, light and access.
Also available in County Durham
- Two-storey front extensions
- Two-storey extensions for end-of-terrace houses
- Two-storey annexe extensions
- Garage conversions with a room above
- 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
Rules for Darlington
Darlington 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
Questions about extensions in Darlington
Do you cover Darlington?
Yes. We cover Darlington (DL1, DL2 and DL3) and the surrounding area, including Newton Aycliffe and Yarm. The first site visit is free.
What does a two-storey extension cost in Darlington?
Using our North East England guide, a two-storey rear extension with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) is about £50,500–£68,000 including VAT. An extension over a garage is about £28,500–£41,500.
Which other places near Darlington do you cover?
Everywhere around it, including Newton Aycliffe (6.6 miles), Yarm (7.9 miles) and Shildon (8.2 miles), and the rest of County Durham.