Free Tool

How Long Will My Project Take?

Get a realistic week-by-week timeline from first idea to completion. Answer four quick questions to see all the approval stages laid out in a visual Gantt chart — including which stages can run in parallel to save time.

Typical end-to-end timelines at a glance

6–9 mo
Single-storey rear extension (PD or planning)
8–12 mo
Two-storey extension or loft dormer
4–6 mo
Velux-only loft conversion or garage conversion
2–4 mo
Internal wall removal (no planning needed)

These are typical timelines for projects starting from scratch. If you already have drawings or approvals in place, your timeline will be shorter — select your current stage in the tool below to adjust.

The biggest time saving: start builder procurement and all approval applications at the same time as soon as drawings are ready — not one after another.

Add your address to see council-specific planning decision times in your results.

Project type
Your stage
Planning
Timeline

Step 1 — What type of project is it?

Select the type of project you are planning. This determines the design, structural, approval, and construction durations used to build your timeline.

Frequently asked questions