Two-storey extensions in Billericay
Everything for a two-storey extension in Billericay, in one place: types, guide prices for the East of England, the approval rules in England and how to get started.
Billericay at a glance
- Postcode districts
- CM4, CM11 and CM12
- Area
- Essex, England
- Price region
- East of England
- Nearest towns
- Basildon (4.5 miles), Wickford (4.6 miles), Brentwood (4.9 miles), Pitsea (5.9 miles)
- Distance to Southend-on-Sea
- about 14.1 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.
We cover Billericay (CM4, CM11 and CM12) and the places around it, including Basildon (4.5 miles), Wickford (4.6 miles) and Brentwood.
Extensions available in Billericay
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
Design, approvals and build for Billericay homes. Guide from £124,000.
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Part single, part two-storey extensions
For homes in Billericay: typical guide from £74,000.
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Extensions over a garage
Design, approvals and build for Billericay homes. Guide from £32,500.
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First-floor extensions
Design, approvals and build for Billericay homes. Guide from £26,000.
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Two-storey extensions for semi-detached houses
Billericay guide price from £57,500, Standard spec.
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Two-storey extensions for detached houses
Our East of England guide starts at £88,500 for this type.
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Kitchen extensions with bedrooms above
Guide from £57,500 (before kitchen units) in Billericay, including VAT.
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Extra bedroom and en-suite extensions
Our East of England guide starts at £57,500 (plus en-suite) for this type.
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Essex, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
Also available in Essex
- 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 Billericay
Billericay 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 Billericay
Do you cover Billericay?
Yes. We cover Billericay (CM4, CM11 and CM12) and the surrounding area, including Basildon and Wickford. The first site visit is free.
What does a two-storey extension cost in Billericay?
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 Billericay do you cover?
Everywhere around it, including Basildon (4.5 miles), Wickford (4.6 miles) and Brentwood (4.9 miles), and the rest of Essex.