Shell Side extension

Question

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?

Rick · Accepted Answer

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,

Othmani · Answer

The cost for extention in SE range from £2500 per sqm to £3500 sqm labour and Materials

Jason · Answer

Hi build cost from £2450 per m2 to £3500 per m2 depending in finishes and structure

Izmir · Answer

For a 20m² side extension in the South East of England, built to shell stage with services included, a realistic price range would be:

£30000– £37000 + VAT

This would typically include:
	•	Foundations, brick/blockwork
	•	Flat roof construction
	•	One window to each side
	•	Supply and installation of a 3.5m RSJ to connect to the existing house
	•	Subfloor preparation
	•	Hot and cold water pipework
	•	Soil and waste pipe connections

Costs can vary depending on ground conditions, access, specification, and structural complexity, which can only be properly assessed on site.

Kamal · Answer

Price range would be between £2500 - £3500 labour and materials

Doug · Answer

Hi 
That’s a big extension you would be looking at around £35k for the structure then you’ll have internal finishing to pay for 
That’s based on Yorkshire area 
However you architect should be able to give you a better idea as they would deal with builders in that area

Shell Side extension

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