Two-storey extensions in Diss
Planning a bigger home in Diss? Compare extension types and guide prices below, then book a free site visit.
Diss at a glance
- Postcode districts
- IP21, IP22 and IP23
- Area
- Suffolk, England
- Price region
- East of England
- Nearest towns
- Attleborough (Norfolk) (10.5 miles), Stowmarket (13.8 miles), Thetford (15.4 miles), Watton (17.5 miles)
- Distance to Ipswich
- about 22 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 districts IP21, IP22 and IP23 in and around Diss, along with neighbouring Attleborough (Norfolk), Stowmarket and Thetford.
Extensions available in Diss
Two-storey rear extensions
Guide from £57,500 in Diss, including VAT.
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Two-storey side extensions
From £88,500 in Diss. Free visit to firm it up.
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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
Design, approvals and build for Diss homes. Guide from £74,000.
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Extensions over a garage
Guide from £32,500 in Diss, including VAT.
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First-floor extensions
Design, approvals and build for Diss homes. Guide from £26,000.
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Two-storey extensions for semi-detached houses
Guide from £57,500 in Diss, including VAT.
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Two-storey extensions for detached houses
Design, approvals and build for Diss homes. Guide from £88,500.
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Kitchen extensions with bedrooms above
Our East of England guide starts at £57,500 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
Diss guide price from £57,500 (plus en-suite), Standard spec.
Learn moreWhich type suits your house?
The boundaries usually decide it. Two-storey work close to a neighbour needs careful design for light and privacy, so at the visit in Diss we measure distances to every boundary before suggesting a type.
Also available in Suffolk
- 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 Diss
Diss 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 Diss
Do you cover Diss?
Yes. We cover Diss (IP21, IP22 and IP23) and the surrounding area, including Attleborough (Norfolk) and Stowmarket. The first site visit is free.
What does a two-storey extension cost in Diss?
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 Diss do you cover?
Everywhere around it, including Attleborough (Norfolk) (10.5 miles), Stowmarket (13.8 miles) and Thetford (15.4 miles), and the rest of Suffolk.