Arundel · House Extension

House Extension
in Arundel

Compare quotes from vetted Arundel extension builders for single-storey, double-storey and rear extensions. Transparent pricing from £19,500. Free, no-obligation quotes — results in 24 hours.

  • Local house extension specialists in Arundel
  • Up to 3 free quotes — compare and choose with no pressure
  • Transparent pricing, no hidden costs or surprise charges
  • Compare up to 3 quotes — you choose who to hire
Get 3 Free Quotes → See Arundel Costs
Get My 3 Free Quotes
Takes 60 seconds · No spam · No obligation
Local House Extension Specialists
Free, no-obligation quotes
No Obligation
Free No-Obligation Quotes
Local Arundel Experts
3
Free House Extension Quotes Per Job
1,000+
UK Homeowners Matched
519
UK Towns Covered
£0
To Get Your Quotes
Arundel House Extension Prices

How Much Do House Extension Cost in Arundel?

Real prices from completed projects in Arundel 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.

Full cost guide →
Single-storey extension
Rear or Side-Return Extension
£ 30,000 – £60,000

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 →
Double-storey extension
Full Double-Storey Rear Extension
£ 60,000 – £108,000

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 →
Side Extension
Side-Return or Infill Extension
£ 19,500 – £45,000

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 →
Your Project
Get an Accurate Quote

Costs depend on size, spec and access. The best way to know your exact price is to compare 3 quotes from local specialists.

Get free quotes →

Arundel 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 Arundel and South East. Always get at least 3 written quotes before committing to any builder.

Why BestBuilders for House Extension in Arundel

House Extension Specialists Who Know Arundel

Tell us about your house extension project once and up to three local specialists who cover Arundel get in touch with quotes — free, with no obligation, and you choose who to hire.

Builders based in and around Arundel typically cover Dover, Wokingham and Littlehampton too, so you are not limited to firms with a Arundel address when comparing quotes across the South East area.

It helps to know the regional picture before you budget: 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. Three like-for-like quotes will show where your Arundel project lands.

Local facts: Arundel

  • Local planning authority: Arun Council (West Sussex)
  • Region: South East
  • Town-centre postcode district: BN18
  • Average house price (Arun local authority, June 2026): £321,927 (+3.1% year on year) — detached £554,358, semi-detached £352,866, terraced £275,756, flats £167,592
  • BestBuilders house extension members covering Arundel: Domuss Property Service Ltd (13 miles)

Planning-authority, region and postcode data: ONS Postcode Directory (Open Government Licence). House prices: HM Land Registry UK House Price Index for the local authority (OGL). Member coverage is each member's own registered base and travel radius.

Start My Free Quote →

How It Works

1
Tell us your project
Describe your house extension project and postcode. Takes 60 seconds.
2
We match you instantly
We send your brief to up to 3 local house extension specialists in Arundel.
3
Compare and choose
Review quotes, profiles and reviews. No obligation to proceed.

Every Builder We Recommend Is:

✓ Minimum Free for homeowners
✓ Holds relevant trade qualifications
✓ Has a minimum of You choose who to hire before joining
✓ Actively monitored — removed for sustained negative feedback
Frequently Asked Questions

House Extension in Arundel — FAQs

Single-storey extensions in Arundel typically run £2,000 to £3,000 per square metre, so a 20 square metre rear extension usually costs £40,000 to £60,000. Two-storey extensions cost more in total but less per square metre because the roof and foundations are shared.
Many single-storey rear extensions in Arundel fall under permitted development, up to 3 metres for an attached house or 4 metres for a detached one, or up to 6 and 8 metres under the larger home extension prior approval scheme. Conservation areas, listed buildings and most side extensions need full planning permission, so check with your builder first.
A single-storey extension usually takes 10 to 16 weeks on site, and a two-storey extension 16 to 24 weeks, weather and access permitting. Allow time for design, planning and building regulations approval before work begins in Arundel.
If your extension is built up to or astride a shared boundary, or involves digging near the foundations of a neighbouring property, the Party Wall Act applies and you must serve notice. Most Arundel builders flag this early so a party wall surveyor can be arranged in good time.
Yes, almost all extensions need building regulations approval covering structure, insulation, drainage and fire safety, even when planning permission is not required. Your Arundel builder works to these standards and arranges building control inspections at each key stage.
More House Extension Resources

Plan Your house extension Project in Arundel

Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Arundel 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 local 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:

💷 Cost Guides 📋 Planning Permission ⚖️ Compare Builders 🛠 How-To Guides 📊 Industry Insights 🏛 UK Planning Rules 📚 All Guides
Nearby Areas

House Extension Near Arundel

We also connect homeowners with local house extension specialists in towns surrounding Arundel.

Reading East Grinstead

Or view all building services in Arundel →

About This Page

Editorial standards & how to reach us

This House Extension in Arundel page is maintained by the BestBuilders Editorial Team. We vet the house extension specialists in our network but do not check insurance or qualifications. Ask any of them for their public liability certificate, their trade-body membership number (check it on that body’s own register) and two recent local jobs you can go and see. The cost ranges shown are cross-referenced against RICS BCIS regional data and itemised quotes flowing through the BestBuilders platform each month. For a full cost breakdown see our House Extension cost guide. FAQ content is reviewed quarterly.

Spotted something out of date? If a listed house extension specialist has moved on, a cost range looks wrong for Arundel, or you've had a poor experience with a contractor we recommended — we want to know. Email info@bestbuilders.co.uk or call 0800 852 7782. Every report is investigated and accepted corrections typically go live within 48 hours.

BestBuilders Editorial Team
UK-based · Reviewed 20 April 2026
Contact
Editorial policy
Helpful Resources

Planning Your House Extension in Arundel

Before you compare quotes, it's worth understanding the full UK price picture for house extension and how Arundel 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 Arundel

Find out whether your house extension needs planning permission in Arundel, 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.

Ready to Start?

Get Free House Extension Quotes in Arundel Today

Tell us about your project and we'll match you with 3 local house extension specialists in Arundel. Free, no-obligation, no spam — results in 24 hours.

Get My 3 Free Quotes → View Arundel Costs
🏛️Planning permission for House Extension in Arundel?Check whether your project needs permission before you start — read our 2026 planning guide →
Maintained by the BestBuilders Editorial Team
House Extension cost data for Arundel checked by our UK editorial team. Credentials, cost data & FAQs reviewed quarterly.Reviewed by the BestBuilders editorial team · Last updated: 22 August 2026. How we research & fact-check
✉ info@bestbuilders.co.uk
💬 Not sure about something? Ask a building expert
Planning permission, costs, building regs, choosing a trade — free answers from our editorial team, published for other homeowners too.
Get an expert answer →