How Much Does a Home Extension Cost in Chichester? 2025 Local Pricing Guide
A home extension is one of the most effective ways to add space and value to your property — especially in high-demand areas like Chichester, Fishbourne, Bosham, Hunston and East Wittering, where moving home can be costly and competitive. Whether you’re looking to extend your kitchen, add a new bedroom, or create an open-plan living area, understanding local costs is essential before planning your project.
This guide outlines the typical cost of home extensions in Chichester in 2025, what affects pricing, and how to plan your budget with confidence.
1. Typical Extension Costs in Chichester (2025)
Extension costs vary based on size, design, materials and the complexity of the build. Below are average price ranges for Chichester homeowners:
Single-Storey Extension
£1,800 – £2,500 per m²
Ideal for kitchen extensions, dining rooms and larger living spaces.
Double-Storey Extension
£2,200 – £3,200 per m²
Offers major value by expanding both floor levels with a smaller footprint cost.
Rear or Side Extensions
£30,000 – £60,000+
Common across Chichester’s family homes, especially where garden space allows.
Wrap-Around Extensions
£55,000 – £95,000+
Perfect for transforming ground-floor layouts in semi-detached and detached homes.
These figures vary depending on structural needs, insulation standards, glazing choices and finish quality.
2. Key Factors That Influence Extension Costs
1. Property Type
Homes in older parts of Chichester – especially those near the cathedral quarter – may require additional structural work or heritage-sensitive designs.
2. Materials & Design
Higher-end finishes, bifold doors, roof lanterns and custom layouts increase costs.
3. Ground Conditions
Chichester’s coastal and clay-heavy soil can sometimes require deeper foundations.
4. Planning Requirements
Extensions in conservation areas such as parts of Fishbourne and Bosham may require more detailed planning submissions.
5. Size & Complexity
Larger or more intricate designs take longer and require more materials, labour and engineering input.
3. Do You Need Planning Permission in Chichester?
Many extensions fall under Permitted Development, meaning planning permission may not be required if your design meets certain height and size limits.
However, permission may be needed if:
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- The property is in a conservation area
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- You live in a listed building
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- The extension significantly alters the appearance of the home
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- The extension exceeds Permitted Development limits
Working with a builder familiar with Chichester District Council’s planning rules helps ensure everything runs smoothly.
4. How Long Does an Extension Take to Build?
Timelines vary depending on design and complexity, but typical durations include:
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- Small single-storey extension: 8–12 weeks
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- Medium extension: 12–18 weeks
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- Large or double-storey extension: 16–24+ weeks
Planning approval, architectural drawings and structural calculations can add several weeks before construction begins.
5. Why Extensions Are So Popular in Chichester
Chichester’s competitive property market means extending is often more cost-effective than moving. Benefits include:
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- Increased living space
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- Higher property value
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- Modernised layouts
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- More natural light
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- Cheaper than buying a larger home
Homeowners in areas like Donnington, Tangmere, North Mundham and the Witterings frequently choose extensions to gain extra family space without relocating