How our service works
This site is an introduction service. We do not design, make or build extensions. When you ask for a quote, we find one firm that does, and we only pass your details on with your say-so.
You fill in the form
Your postcode, what you want to build, a rough size, how materials could reach the garden, and when you hope to start.
We look for a builder
We search for an extension builder who makes or fits modular extensions and takes on work in your borough.
We tell you who it is
Within one working day we email or phone you with the firm’s name. Say yes and we pass on your enquiry. Say no and it goes nowhere.
They visit and price it
The firm looks at the house, the street and the ground, then gives you its price. Any contract is between you and that firm.
How the service is paid for
The builder pays us a fee for each introduction. You pay us nothing, whether or not you go ahead.
What we will not do
- Ask you for money or a deposit.
- Send your enquiry to anyone before you agree, or to more than the one firm we named.
- Price your job. Only the firm can do that after seeing the house.
- Add you to a mailing list.
No link to any maker
This site has no connection with any extension maker or builder that uses a similar name.
About the prices on this site
Prices are typical national ranges for 2026, including VAT, with an allowance of 20 to 40% for London. They are a guide, not a quote. Fees for planning and building control come from the published fee tables.
Get in touch
Email support@grubleads.com. Our privacy notice explains how to have your details deleted.
Get a quote for your extension
Postcode, four quick questions, then your contact details. It takes about a minute.
We are an introduction service, not a builder. We look for a firm that works in your borough, tell you who it is, and pass your details on only when you say yes.
Got it. Thank you.
- We look for an extension builder who takes on jobs like yours in your part of London, and we email or phone you with the firm's name.
- If you are happy with that firm, we send it what you told us. If not, nothing goes anywhere.
- The firm arranges a visit, looks at the access and the ground, and gives you its price.