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Typical length of time


Interview architects

2-4 weeks

Appoint architects

4 weeks

Feasibility study

3-6 weeks

Building survey to planning application

4-7 weeks

Planning process

8 weeks

Building control application production

5-7 weeks

Building control process

5 weeks

Preparation of detail drawings

4-6 weeks

Tender process

4 weeks

Lead in time for contractor

4-10 weeks

Construction period

16-20 weeks

Total time

59-81 weeks

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Initial visit

Brief and building appraisal

Sketch Design


Costs; pre-planning application

Detail design



Costs; post-planning application