Cost models

Finished basement cost models

‘Finishing’ includes heating and electrical installations but excludes sanitary fittings and their associated macerator or pumped drainage system, all of which can vary considerably in price, depending on the quality level selected. These include the cost of finishing a basement room for each of the three scenarios.

Table below shows cost of fully finished basement wholly below ground

House Type Wide front
detached
10.0 × 8.0 m
Wide front
detached
8.1 × 5.4 m
Narrow front
detached
6.0 × 7.2 m
Narrow front
semi-detached
6.0 × 7.2 m
Narrow front
terraced
6.0 × 7.2 m
In-Situ concrete structure £103,300
£1,291/m2
£73,950
£1,691/m2
£73,300
£1,697/m2
£66,450
£1,538/m2
£62,900
£1,456/m2
Masonry structure £96,750
£1,209/m2
£68,950
£1,576/m2
£68,400
£1,583/m2
£61,600
£1,426/m2
£57,600
£1,333/m2

 Table below shows cost of fully finished basement partially below ground

House Type Wide front
detached
10.0 × 8.0 m
Wide front
detached
8.1 × 5.4 m
Narrow front
detached
6.0 × 7.2 m
Narrow front
semi-detached
6.0 × 7.2 m
Narrow front
terraced
6.0 × 7.2 m
In-Situ concrete structure £93,250
£1,166/m2
£66,800
£1,527/m2
£66,250
£1,534/m2
£60,150
£1,392/m2
£57,150
£1,323/m2
Masonry structure £86,700
£1,084/m2
£61,800
£1,413/m2
£61,350
£1,420/m2
£55,350
£1,281/m2
£51,850
£1,200/m2

 Table below shows cost of fully finished basement on sloping site

House Type Wide front
detached
10.0 × 8.0 m
Wide front
detached
8.1 × 5.4 m
Narrow front
detached
6.0 × 7.2 m
Narrow front
semi-detached
6.0 × 7.2 m
Narrow front
terraced
6.0 × 7.2 m
In-Situ concrete structure £77,750
£972/m2
£53,950
£1,233/m2
£54,300
£1,257/m2
£50,800
£1,176/m2
£48,300
£1,118/m2
Masonry structure £75,500
£944/m2
£52,550
£1,201/m2
£52,150
£1,207/m2
£46,150
£1,068/m2
£43,950
£1,017/m2

 For more information such as costs of 'unfinished' basements (structural costs) and for comparative costs of constructing houses with, and without, basements, please refer to our Basement Cost Study publication.

 

Basements: Costs

Reports on a study carried out to establish the potential benefits and viability of basements in housing. This publication gives details of the effect a basement has on construction costs, land use and profitability using a cost comparison model.

This has been updated to 2016 prices.