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Shell Side extension
I want to build a 20 metre squared side extension in the south east of England.
1 window either side and a flat roof.
3.5M RSJ to connect it up to the current house.
i wanted subfloor, hot and cold water pipes along with soil and waste pipe connected up.
What would the price range be for such a job in the south east of England?
Expert Trade Answers
"The cost for extention in SE range from £2500 per sqm to £3500 sqm labour and Materials"
Answered on 21st Jan 2026 - Member since Jul 2019 -
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"It depends on many factors, age and style of house, local authority, existing heating system and quality of finish. As a rule of thumb current costs are £1500 - £2000 per square meter,"
Answered on 21st Jan 2026 - Member since Feb 2025 -
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