Two-storey extensions in Weymouth
We design, get approval for and build two-storey extensions in Weymouth and the surrounding area. Choose the type of extension below or book a free site visit.
Weymouth at a glance
- Postcode districts
- DT3 and DT4
- Area
- Dorset, England
- Price region
- South West England
- Nearest towns
- Portland (3.3 miles), Dorchester (7.2 miles), Bridport (15.4 miles), Blandford Forum (21.4 miles)
- Distance to Bournemouth
- about 26.5 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.
Around Weymouth we also work in Portland, Dorchester and Bridport, and across the rest of Dorset. Postcode districts in and near Weymouth: DT3 and DT4.
Extensions available in Weymouth
Two-storey rear extensions
Our South West England guide starts at £57,500 for this type.
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Two-storey side extensions
Our South West England guide starts at £88,500 for this type.
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Two-storey wraparound extensions
Our South West England guide starts at £124,000 for this type.
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Part single, part two-storey extensions
For homes in Weymouth: typical guide from £74,000.
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Extensions over a garage
From £32,500 in Weymouth. Free visit to firm it up.
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First-floor extensions
Guide from £26,000 in Weymouth, including VAT.
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Two-storey extensions for semi-detached houses
Guide from £57,500 in Weymouth, including VAT.
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Two-storey extensions for detached houses
For homes in Weymouth: typical guide from £88,500.
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Kitchen extensions with bedrooms above
For homes in Weymouth: typical guide from £57,500 (before kitchen units).
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Extra bedroom and en-suite extensions
Weymouth guide price from £57,500 (plus en-suite), Standard spec.
Learn moreWhich type suits your house?
Which type suits your house in Weymouth 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 Dorset
- 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 Weymouth
Weymouth 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 Weymouth
Do you cover Weymouth?
Yes. We cover Weymouth (DT3 and DT4) and the surrounding area, including Portland and Dorchester. The first site visit is free.
What does a two-storey extension cost in Weymouth?
Using our South West 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 Weymouth do you cover?
Everywhere around it, including Portland (3.3 miles), Dorchester (7.2 miles) and Bridport (15.4 miles), and the rest of Dorset.