Look for relevant extension experience
Ask about rear, side-return, wraparound or double-storey extensions that are similar to your property type and level of finish.
Discuss access and logistics early
London projects can involve narrow side access, controlled parking, skip restrictions, neighbour interfaces and limited storage. These factors influence cost and programme.
Clarify structural and temporary works
Steelwork, propping, openings and temporary weather protection should be planned carefully. Confirm who is responsible for design coordination and specialist installation.
Plan for an occupied property
If you will remain in the home, agree protection, temporary kitchen or washing arrangements, dust control, working hours and how safe access will be maintained.
Watch long-lead items
Windows, doors, kitchens, bespoke joinery and some finishes can affect the critical path. Ask the contractor how procurement dates fit into the proposed programme.
Compare contractors on the same basis
Use consistent drawings and specifications, then compare scope, exclusions, programme, management and payment terms as well as the total price.
Frequently asked questions
How early should I speak to extension contractors?
Early market conversations can be useful, but meaningful pricing is easier once the scope and design are sufficiently developed.
Can BuildConnect UK help me find London contractors?
Yes. You can post your project free and relevant companies can assess the opportunity while your private contact details remain controlled until you approve an introduction.
What information should I include for a London extension?
Location, project type, drawings, approximate budget, target timing, access constraints, whether the home is occupied and any client-supplied items are all useful.
Related free guides
How to Find a Builder for Your Project
A practical UK guide to finding suitable builders, checking company information, comparing quotations and choosing who to speak to before appointment.
Read guide →How to Choose a Builder for Your Project
A practical UK checklist for comparing builders, checking company details, insurance, experience, programme, scope, exclusions and payment terms before appointment.
Read guide →Questions to Ask a Builder Before You Appoint Them
Use these practical questions before appointing a UK builder or construction company for an extension, refurbishment, loft conversion or renovation.
Read guide →Next step
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