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Cost Calculator

Our calculator offers a straightforward estimated price for your new house extension. This user-friendly tool serves as a valuable guide to assist you in determining the most suitable extension style for your project.

Choose your option

Detached

Semi-Detched

Semi
Detached

House Extension Icon

Flat Roof

Medium Rear Extension

32m2 Estimated Cost:

£36,000

House Extension Icon

Crown Roof

Medium Rear Extension

4m x 8m Estimated Cost:

£128,000

House Extension Icon

Flat Roof

Medium Smaller Rear Extension

4m x 4m Estimated Cost:

£48,000

House Extension Icon

Flat Roof

Large Wrap Around Extension

38m2 Estimated Cost:

£114,000

House Extension Icon

Flat Roof

Medium Rear Extension

4m x 8m Estimated Cost:

£96,000

spaces4you - Detached Crown Roof Large Wraparound Extension

Crown Roof

Large Wrap Around Extension

48m2 Estimated Cost:

£148,000

House Extension Icon

Crown Roof

Medium Rear Extension

4m x 8m Estimated Cost:

£128,000

Terraced Flat Back

Terraced
Flat Back

House Extension Icon

Pitched Roof

Rear Extension

18m2 Estimated Cost:

£54,000

Space4You | House Extension Icon | Surrey, UK

Crown Roof

Rear Extension

40m2 Estimated Cost:

£120,000

Space4You | House Extension Icon | Surrey, UK

Gable Roof

Rear Extension

32m2 Estimated Cost:

£96,000

Space4You | House Extension Icon | Surrey, UK

Flat Roof

Rear Extension

21m2 Estimated Cost:

£63,000

Terraced L Shape

Terraced
L Shape

Space4You | House Extension Icon | Surrey, UK

Gable Roof

Large Wraparound Extension

45m2 Estimated Cost:

£115,000

Space4You | House Extension Icon | Surrey, UK

Gable Roof

Medium Wraparound Extension

36m2 Estimated Cost:

£98,000

Space4You | House Extension Icon | Surrey, UK

Gable Roof

Small Wraparound Extension

28m2 Estimated Cost:

£64,000

Space4You | House Extension Icon | Surrey, UK

Pitched & Flat Roof

Large Side & Rear Extension

34m2 Estimated Cost:

£94,000

Space4You | House Extension Icon | Surrey, UK

Pitched Roof

Large Side Return

32m2 Estimated Cost:

£96,000

Space4You | House Extension Icon | Surrey, UK

Flat Roof

Small Side Return

20m2 Estimated Cost:

£60,000

Space4You | House Extension Icon | Surrey, UK

Flat Roof

Large Wraparound Extension

48m2 Estimated Cost:

£120,000

Space4You | House Extension Icon | Surrey, UK

Flat Roof

Medium Wraparound Extension

30m2 Estimated Cost:

£90,000

Space4You | House Extension Icon | Surrey, UK

Flat Roof

Small Wraparound Extension

32m2 Estimated Cost:

£66,000

Space4You | House Extension Icon | Surrey, UK

Pitched & Flat Roof

Large Side & Rear Extension

28m2 Estimated Cost:

£84,000

Space4You | House Extension Icon | Surrey, UK

Flat Roof

Medium Side Return

28m2 Estimated Cost:

£64,000

Space4You | House Extension Icon | Surrey, UK

Flat Roof

Rear Extension

15m2 Estimated Cost:

£45,000

Space4You | House Extension Icon | Surrey, UK

Pitched (Hip) Roof

Large Wraparound Extension

59m2 Estimated Cost:

£130,000

Space4You | House Extension Icon | Surrey, UK

Pitched (Hip) Roof

Medium Wraparound Extension

32m2 Estimated Cost:

£96,000

Space4You | House Extension Icon | Surrey, UK

Flat Roof

Small Wraparound Extension

20m2 Estimated Cost:

£60,000

Space4You | House Extension Icon | Surrey, UK

Flat Roof

Large Side Return

30m2 Estimated Cost:

£90,000

Space4You | House Extension Icon | Surrey, UK

Pitched Roof

Medium Side Extension

28m2 Estimated Cost:

£68,000

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