How long will my house extension take to build?

Timescale would be individual to each project and current workload. However, based on a typical house extension, an appropriate timeframe allowance from appointment to starting construction may be around 6 to 7 months. This timescale assumes a builder would be available once Building Regulations is achieved. In reality, a good builder may have between 6 months to a year lead-in time and therefore this would extend this timescale significantly.

A time frame, where planning permission is granted without changes, is shown below:

Weeks 1-6 (Work Stages 1 & 2)

Survey carried out. Existing drawings drawn. Proposed options drawn. Meeting(s) with client to discuss proposals. Finalise option. Complete & submit planning drawings and application.

Weeks 7-14 (Work Stages 1 & 2)

Planning application reviewed by County Council (8 weeks).

Weeks 15-20 (Work Stages 3 & 4)

Building regulation drawings and notes completed. Building regulations application submitted.

Weeks 21-26 (Work Stages 3 & 4)

Building regulation information used to seek quotations from builders.

Building regulation submission reviewed by County Council Building Control (5 weeks).

Week 27 onwards

Building regulations approval received. Potentially start building – dependant on builder’s availability.

Construction periods vary depending on the scheme and builder, however allowing 12-16 weeks for a builder to complete a standard house extension is a typical construction time.

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