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How to plan an Extension

No two extension projects are the same, and the timelines can differ dramatically depending on the size and complexity of the project. However, we have created an example timeline to give you a rough idea of the key milestones in a typical extension project, the order these are likely to happen in, and an approximation of when they might take place.

Your builder will be able to provide a specific timeline for your project which will help highlight key periods where major decisions have to be made on your part, or when disruption to your daily routine is likely to take place!

* Expect a two storey extension to take between three and five weeks longer due to extra floor structure, additional wall construction and extra works relating to plastering, plumbing, electrics and decoration etc.

Key milestones and timings

Week 1

Set out. Dig out footings. Pour concrete foundations. First delivery of materials.

Week 2

Build substructure up to damp- proof course. Install/adjust external drainage routes (where appropriate). Install damp-proof course. Pour concrete oversite/floor structure. Erect scaffolding.

Week 3

Commence construction of exterior walls.

Week 4

Commence construction of interior walls. Complete construction of exterior walls.

Week 5

Install roof structure and begin covering. Complete instruction of interior walls.

Week 6

Install windows and doors.

Week 7

Install/adjust interior drainage (where appropriate). First fix electrics and plumbing. First fix carpentary.

Week 8

Break through to existing house including installation of steels.

Make good all works as a result of breaking through.

Week 9

Plasterboard and plaster to all areas

Week 10

Second fix electrics. Second fix plumbing (where appropriate). Install flooring.

Week 11

Complete external works – paving, gardening etc. Install skirting. Commence decorating.

Week 12

Complete decoration. Clean down and remove all waste. Carry out snagging.

Week 13

Final inspection. Handover.

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