Two-storey extensions in Letchworth Garden City
Need more room in Letchworth Garden City? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Letchworth Garden City at a glance
- Postcode districts
- SG6
- Area
- Hertfordshire, England
- Price region
- East of England
- Nearest towns
- Baldock (1.7 miles), Hitchin (3.2 miles), Henlow (4.3 miles), Stevenage (5.4 miles)
- Distance to Watford
- about 23.5 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 district SG6 in and around Letchworth Garden City, along with neighbouring Baldock, Hitchin and Henlow.
Extensions available in Letchworth Garden City
Two-storey rear extensions
Our East of England guide starts at £57,500 for this type.
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Two-storey side extensions
Our East of England guide starts at £88,500 for this type.
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Two-storey wraparound extensions
Our East of England guide starts at £124,000 for this type.
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Part single, part two-storey extensions
Letchworth Garden City guide price from £74,000, Standard spec.
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Extensions over a garage
Letchworth Garden City guide price from £32,500, Standard spec.
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First-floor extensions
For homes in Letchworth Garden City: typical guide from £26,000.
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Two-storey extensions for semi-detached houses
Letchworth Garden City guide price from £57,500, Standard spec.
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Two-storey extensions for detached houses
From £88,500 in Letchworth Garden City. Free visit to firm it up.
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Kitchen extensions with bedrooms above
For homes in Letchworth Garden City: typical guide from £57,500 (before kitchen units).
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Extra bedroom and en-suite extensions
For homes in Letchworth Garden City: typical guide from £57,500 (plus en-suite).
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Hertfordshire, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
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 Letchworth Garden City
Letchworth Garden City 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 Letchworth Garden City
Do you cover Letchworth Garden City?
Yes. We cover Letchworth Garden City (SG6) and the surrounding area, including Baldock and Hitchin. The first site visit is free.
What does a two-storey extension cost in Letchworth Garden City?
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 Letchworth Garden City do you cover?
Everywhere around it, including Baldock (1.7 miles), Hitchin (3.2 miles) and Henlow (4.3 miles), and the rest of Hertfordshire.