Two-storey extensions in Stevenage
Need more room in Stevenage? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Stevenage at a glance
- Postcode districts
- SG1 and SG2
- Area
- Hertfordshire, England
- Price region
- East of England
- Nearest towns
- Codicote (3.9 miles), Hitchin (4.8 miles), Letchworth Garden City (5.4 miles), Baldock (5.9 miles)
- Distance to Watford
- about 19 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 Stevenage (SG1 and SG2) and the places around it, including Codicote (3.9 miles), Hitchin (4.8 miles) and Letchworth Garden City.
Extensions available in Stevenage
Two-storey rear extensions
From £57,500 in Stevenage. Free visit to firm it up.
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Two-storey side extensions
Stevenage guide price from £88,500, Standard spec.
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Two-storey wraparound extensions
Stevenage guide price from £124,000, Standard spec.
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Part single, part two-storey extensions
For homes in Stevenage: typical guide from £74,000.
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Extensions over a garage
For homes in Stevenage: typical guide from £32,500.
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First-floor extensions
Design, approvals and build for Stevenage homes. Guide from £26,000.
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Two-storey extensions for semi-detached houses
From £57,500 in Stevenage. Free visit to firm it up.
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Two-storey extensions for detached houses
For homes in Stevenage: typical guide from £88,500.
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Kitchen extensions with bedrooms above
Design, approvals and build for Stevenage homes. Guide from £57,500 (before kitchen units).
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Extra bedroom and en-suite extensions
Stevenage guide price from £57,500 (plus en-suite), Standard spec.
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 Hertfordshire
- 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 Stevenage
Stevenage 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 Stevenage
Do you cover Stevenage?
Yes. We cover Stevenage (SG1 and SG2) and the surrounding area, including Codicote and Hitchin. The first site visit is free.
What does a two-storey extension cost in Stevenage?
Using our East of 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 £57,500–£78,000 including VAT. An extension over a garage is about £32,500–£47,500.
Which other places near Stevenage do you cover?
Everywhere around it, including Codicote (3.9 miles), Hitchin (4.8 miles) and Letchworth Garden City (5.4 miles), and the rest of Hertfordshire.