House Extension
in Worthing
Compare quotes from vetted Worthing extension builders for single-storey, double-storey and rear extensions. Transparent pricing from £19,500. Free, no-obligation quotes — results in 24 hours.
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How Much Do House Extension Cost in Worthing?
Real prices from completed projects in Worthing 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 →Worthing pricing note: South East England prices run 15–25% above the national average, particularly in Surrey, Kent and areas within commuter distance of London. Strong demand and limited contractor availability in peak season push costs higher. Prices shown are indicative ranges for Worthing and South East. Always get at least 3 written quotes before committing to any builder.
House Extension Specialists Who Know Worthing
Home renovation activity in Worthing 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 Worthing 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 Worthing 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 Worthing Homeowners Say About Our House Extension Specialists
Rear and side extension combined on our 1950s pebbledash semi in Worthing. 15m² snug added with a feature gable end and exposed steel detail. Came in at £98600 with bi-folds and lantern. Trial pit done day one to confirm foundation depth was workable.
Compared four extension builders through BestBuilders for the Worthing job. Selected on availability rather than price - we needed to start before winter. CCTV drain survey on day one, no surprises with hidden services. Came in at £51140 over 14 weeks, no surprise extras. EPC went up two bands thanks to the new spec.
Six months later, no settlement cracks anywhere - foundations were clearly done right. Builder we found via BestBuilders in Worthing persuaded us into a wider opening to the original house - the flow is so much better. Total £82560. Stamp duty saved by extending out rather than moving up.
House Extension in Worthing — FAQs
Plan Your house extension Project in Worthing
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Worthing 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
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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 Worthing
We also connect homeowners with vetted house extension specialists in towns surrounding Worthing.
Planning Your House Extension in Worthing
Before you compare quotes, it's worth understanding the full UK price picture for house extension and how Worthing 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 Worthing
Find out whether your house extension needs planning permission in Worthing, 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.