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Builders handle the structural and fabric work that transforms homes, from knocking through load-bearing walls and fitting RSJ steels to constructing single and double storey extensions. Homeowners hire them for loft conversions, garage conversions, full house renovations, kitchen and bathroom strip-outs, and new build or self-build projects. If a job involves foundations, brickwork, blockwork, or structural alterations, a builder is the tradesperson you need.
Builder costs vary enormously depending on ground conditions, structural complexity, the specification of materials, and whether planning permission or building regulations approval is required. A single storey extension can range from around £1,500 to £2,500 per square metre depending on finishes, location, and site access, which is why comparing at least three detailed quotes from different builders is essential before committing to any project of this scale.
Builders in the Trade Quote Network carry out extensions, structural alterations, loft and garage conversions, kitchen and bathroom renovations, and full new build projects across the UK.
A trustworthy builder in the UK should hold a relevant NVQ Level 2 or 3 in Building Construction or a related discipline, and ideally be registered with the Federation of Master Builders (FMB) or carry TrustMark accreditation, both of which require vetting and adherence to a code of conduct. For structural work, check that they are experienced with Building Regulations submissions and can liaise with a structural engineer and an approved building inspector. Membership of the Chartered Institute of Building (CIOB) is a further mark of professionalism for larger or more complex projects.
Before a builder visits to quote, have a clear brief prepared that outlines the scope of work, your intended use of the space, and any planning constraints you are already aware of. If you have existing drawings, a structural engineer's report, or planning permission documents, share these in advance so the builder can quote accurately rather than provisionally. Being clear about your preferred materials, finishes, and timeline will reduce the likelihood of significant price revisions once work is under way.
Once work is complete, ensure the builder provides all relevant Building Regulations completion certificates, which you will need when you sell the property or make an insurance claim. For extensions and conversions, confirm that sign-off from the local authority or an approved inspector has been obtained before making your final payment. Reputable builders will also provide a defects liability period of at least 12 months, and FMB members offer access to a deposit protection and insurance-backed warranty scheme for additional peace of mind.
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