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Extension Structural Planning Checklist

The structural to-dos of a London extension in build order — from trees-and-clay homework through steels, notices and sign-offs. Tick as your project progresses.

What structural planning does an extension need? In order: existing-structure and ground homework (trees, drains, previous alterations), engineered design (openings, new structure, foundations) from your architect's drawings, Building Regulations submission, party wall notices served months before excavation, and construction-stage discipline — build to the calculations and get every discovery re-engineered rather than improvised.

Extension Structural Planning Checklist

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Before design

Design stage

Approvals & notices

Construction

Important: this tool provides general, indicative guidance only. It is not a survey, a diagnosis or a quotation, and it cannot assess your specific property. Figures are broad London planning ranges; the appointed professional confirms actual fees and any repair costs are confirmed by contractors pricing an engineered specification. If you are concerned about your property, request a structural assessment or call.

FAQ

Frequently asked questions

When should the engineer join the project?

As soon as architectural drawings stabilise and before tender — late structural input is the classic cause of redesign, re-quoting and delay.

Why so much emphasis on trees?

Because on clay, nearby tree species and distances set foundation depths under NHBC guidance — the single most common source of quiet five-figure surprises in London extensions.

Who checks the builder follows the design?

Building Control inspects statutory stages; the engineer can be retained for key inspections (foundations, steels) — money well spent on period properties where discoveries are routine.

Want a real answer for your property?

Tools guide; assessments answer. Call or send an enquiry and we will arrange the right specialist help.

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