House Extension
in Sunderland
Compare quotes from vetted Sunderland 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 Sunderland?
Real prices from completed projects in Sunderland 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 →Sunderland 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 Sunderland and North East. Always get at least 3 written quotes before committing to any builder.
House Extension Specialists Who Know Sunderland
Sunderland has a thriving home improvement market driven by a strong local economy and a mix of Victorian terraces, post-war housing and contemporary developments. Finding the right builder is key to any successful project.
Every builder in our Sunderland network is thoroughly vetted before joining BestBuilders. We verify insurance cover, check trade memberships with bodies such as the FMB and CIOB, and require a minimum of five real customer reviews.
From a small bathroom refurbishment to a major double-storey extension, our vetted Sunderland builders cover the full range of residential projects. Request your free quotes today and compare options before making any decisions.
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What Sunderland Homeowners Say About Our House Extension Specialists
Rear and side extension combined on our Victorian terrace in Sunderland. 24m² rear with structural opening through to the existing kitchen and a steel beam above. Total £43600 across 12 weeks on site. FMB-credentialed builder, structural calcs done in-house.
Compared four extension builders through BestBuilders for the Sunderland job. Selected on availability rather than price - we needed to start before winter. Permitted Development route confirmed via a Lawful Development Certificate before any digging. Total £79200 fully turnkey. Moved out for two weeks during the demolition and steel install, the rest was bearable.
Six months later, no settlement cracks anywhere - foundations were clearly done right. Builder we found via BestBuilders in Sunderland specced higher-grade glazing than we asked for - winter heating bills are noticeably lower. Total £60720. Decided to stay rather than move - the extension solved the space problem entirely.
House Extension in Sunderland — FAQs
Plan Your house extension Project in Sunderland
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Sunderland homeowners make informed decisions about their house extension project.
House Extension Cost Guide
Detailed UK price ranges, regional adjustments and worked examples for house extension projects.
Read House Extension Cost Guide →All House Extension Specialists
Browse our nationwide network of vetted house extension contractors covering all 519 UK towns.
Browse House Extension Specialists →All Cost Guides
Compare prices across extensions, lofts, kitchens, bathrooms, roofing, driveways and solar projects.
View All Cost Guides →Planning your house extension project? Read these guides:
House Extension Near Sunderland
We also connect homeowners with vetted house extension specialists in towns surrounding Sunderland.
Planning Your House Extension in Sunderland
Before you compare quotes, it's worth understanding the full UK price picture for house extension and how Sunderland sits within it. The guides below cover average costs, what affects your quote, and how to choose a builder you can trust.
UK House Extension Cost Guide
Full price ranges, worked examples and the factors that move your quote — drawn from real project data across 519 UK towns.
Read the house extension cost guide →House Extension Across the UK
Browse house extension services nationwide, see what's typical in your region, and request quotes from any UK location.
Visit the UK house extension hub →Planning Permission for House Extension in Sunderland
Find out whether your house extension needs planning permission in Sunderland, what Permitted Development limits apply, and how rules differ in conservation areas, Article 4 zones, and listed-building settings.
Read the house extension planning rules →More homeowner resources: all UK building guides, cost guides, planning permission, comparisons, how-to guides and industry insights.