House Extension
in Washington
Compare quotes from vetted Washington extension builders for single-storey, double-storey and rear extensions. Transparent pricing from £14,500. Free, no-obligation quotes — results in 24 hours.
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How Much Do House Extension Cost in Washington?
Real prices from completed projects in Washington and the surrounding area. Costs vary by size, specification and access — use these as a starting guide, then get 3 free quotes for your specific project.
The most popular choice for UK terraces and semis. Adds a kitchen-diner or extra living space at ground level. Typically 3–5m deep, completed in 10–14 weeks.
Get quotes for this →Maximum space gain in a single build — adds a ground-floor room and a bedroom above. Strong ROI in most UK property markets. Requires full planning permission.
Get quotes for this →Ideal for terraced homes with a narrow side alley. Transforms a cramped kitchen into a full-width open-plan space. Often combined with a rear extension.
Get quotes for this →Costs depend on size, spec and access. The best way to know your exact price is to compare 3 quotes from vetted local specialists.
Get free quotes →Washington pricing note: North East England (Newcastle, Sunderland, Teesside) is one of the most affordable regions for building work, with costs running 10–15% below the national average. Excellent value for extensions and loft conversions. Prices shown are indicative ranges for Washington and North East. Always get at least 3 written quotes before committing to any builder.
House Extension Specialists Who Know Washington
Home renovation activity in Washington continues to grow year on year. The area's varied housing stock, from older stone-built properties to new-build estates, means there is always strong demand for skilled, experienced local builders.
Before any builder appears on our Washington platform, we carry out a full vetting check covering public liability insurance, trade qualifications, company registration and verified customer feedback. Only builders who pass every stage are listed.
Our Washington builder network covers extensions, loft conversions, kitchens, bathrooms, roofing, driveways and more. Get up to 3 free, no-obligation quotes within 24 hours and choose the builder that best fits your project and budget.
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What Washington Homeowners Say About Our House Extension Specialists
Found an excellent builder through BestBuilders for our extension project. The quote process was straightforward, the builder was professional throughout and the finished result exceeded our expectations.
We used BestBuilders to find a loft conversion specialist. Received 3 competitive quotes within 48 hours and the builder we chose delivered on time and on budget. Highly recommended.
Good experience overall. The kitchen renovation was completed to a high standard. Minor delays on materials but the builder kept us informed. Would use BestBuilders again.
House Extension in Washington — FAQs
House Extension Near Washington
We also connect homeowners with vetted house extension specialists in towns surrounding Washington.