One of the most common questions homeowners ask before starting an extension is: "How long will it take?" The honest answer is that the total time from first conversation to moving into your new space is usually longer than people expect — not because the construction itself is slow, but because the pre-construction stages take time. This guide explains the full process.
Stage 1: Initial Design and Quotation (2–8 weeks)
The process begins with a site visit, a discussion about your requirements, and the preparation of initial design drawings. Once you are happy with the design, a detailed written quotation is prepared. This stage typically takes 2–8 weeks depending on the complexity of the project and how quickly decisions are made.
Stage 2: Planning Permission (8–16 weeks, if required)
If your extension requires planning permission, a formal application is submitted to Cheshire East Council. The statutory determination period is 8 weeks for householder applications, though complex or contested applications can take longer. If your extension falls within permitted development, this stage is not required, though you may still choose to apply for a Lawful Development Certificate.
Stage 3: Building Regulations (2–4 weeks)
Building Regulations drawings and calculations are prepared and submitted to Building Control. This can run concurrently with the planning stage. Full plans approval typically takes 5 weeks, though a building notice can be used for simpler projects, allowing work to start more quickly.
Stage 4: Construction
| Extension Type | Typical Construction Period |
|---|---|
| Small single-storey rear extension | 8–12 weeks |
| Standard single-storey extension | 10–16 weeks |
| Two-storey extension | 16–24 weeks |
| Large or complex extension | 20–30+ weeks |
Stage 5: Snagging and Completion (1–2 weeks)
At the end of the construction period, a snagging inspection is carried out to identify any minor items that need attention. These are addressed before the final Building Regulations inspection and the issue of the completion certificate.
Total Timescale: A Realistic Summary
For a straightforward single-storey extension within permitted development, the total time from first contact to completion is typically 4–6 months. If planning permission is required, allow 8–12 months. Two-storey extensions with planning permission can take 12–18 months from start to finish.
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