Two-storey extensions in Codicote
Everything for a two-storey extension in Codicote, in one place: types, guide prices for the East of England, the approval rules in England and how to get started.
Codicote at a glance
- Postcode districts
- SG3
- Area
- Hertfordshire, England
- Price region
- East of England
- Nearest towns
- Welwyn Garden City (3.6 miles), Stevenage (3.9 miles), Harpenden (5.6 miles), Hatfield (6 miles)
- Distance to Watford
- about 15.1 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.
Codicote sits about 15.1 miles from Watford. Closer to home, Welwyn Garden City is 3.6 miles away and Stevenage 3.9 miles.
Extensions available in Codicote
Two-storey rear extensions
Our East of England guide starts at £57,500 for this type.
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Two-storey side extensions
Codicote guide price from £88,500, Standard spec.
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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
For homes in Codicote: typical guide from £74,000.
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Extensions over a garage
From £32,500 in Codicote. Free visit to firm it up.
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First-floor extensions
Our East of England guide starts at £26,000 for this type.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Codicote homes. Guide from £57,500.
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Two-storey extensions for detached houses
From £88,500 in Codicote. Free visit to firm it up.
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Kitchen extensions with bedrooms above
For homes in Codicote: typical guide from £57,500 (before kitchen units).
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Extra bedroom and en-suite extensions
From £57,500 (plus en-suite) in Codicote. Free visit to firm it up.
Learn moreWhich type suits your house?
Which type suits your house in Codicote depends mostly on where you have room. A deep garden points to a rear extension; space beside the house points to a side or over-garage extension; a house that already has a single-storey extension can often take a first floor on top.
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 Codicote
Codicote 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 Codicote
Do you cover Codicote?
Yes. We cover Codicote (SG3) and the surrounding area, including Welwyn Garden City and Stevenage. The first site visit is free.
What does a two-storey extension cost in Codicote?
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 Codicote do you cover?
Everywhere around it, including Welwyn Garden City (3.6 miles), Stevenage (3.9 miles) and Harpenden (5.6 miles), and the rest of Hertfordshire.