How Much Does a Home Extension Cost in Crawley? 2025 Local Pricing Guide
Home extensions are one of the most popular building projects across Crawley in 2025. With rising house prices, limited larger properties and growing families, many homeowners in Three Bridges, Pound Hill, Tilgate, Ifield, Broadfield and Furnace Green are choosing to extend their existing homes rather than move.
If you’re considering a building project this year, understanding local extension costs in Crawley will help you plan your budget accurately and avoid unexpected expenses. This guide explains typical prices, what affects costs, planning considerations and what to expect from a professional local builder.
Average Home Extension Costs in Crawley (2025)
Extension costs vary depending on size, design complexity and property type. Below are typical price ranges for Crawley and surrounding areas.
Single-Storey Extensions
£1,800 – £2,500 per m²
Single-storey extensions are ideal for:
-
- Kitchen extensions
-
- Open-plan living spaces
-
- Dining rooms
-
- Family rooms
They are especially popular in Pound Hill and Broadfield, where properties often have good rear garden space.
Double-Storey Extensions
£2,200 – £3,200 per m²
Double-storey extensions provide excellent value by increasing space on both floors.
Common uses include:
-
- Additional bedrooms
-
- Larger bathrooms
-
- Extended kitchens below
These projects are popular in Ifield and Tilgate, where family homes benefit from extra bedroom space.
Side & Rear Extensions
£30,000 – £60,000+
Costs depend on:
-
- Available access
-
- Structural requirements
-
- Size and layout
Side extensions are common in Crawley’s semi-detached properties, where plot width allows for expansion.
Wrap-Around Extensions
£55,000 – £95,000+
Wrap-around extensions combine rear and side extensions to create a complete ground-floor transformation. They are ideal for open-plan kitchen-living areas and are increasingly popular in larger Crawley properties.
What Affects the Cost of an Extension in Crawley?
1. Property Type & Age
Crawley has a high number of 1950s and 1960s New Town homes, which often require:
-
- Structural alterations
-
- Electrical upgrades
-
- Improved insulation
Older properties may require additional work to meet current Building Regulations.
2. Design & Materials
Higher-end finishes will increase costs, including:
-
- Bifold or sliding doors
-
- Roof lanterns and skylights
-
- Underfloor heating
- Bespoke kitchens
3. Ground Conditions
Groundworks vary depending on soil conditions. Some Crawley areas may require deeper foundations, especially for larger extensions.
4. Planning Permission & Regulations
While many extensions fall under Permitted Development, planning permission may be required if:
-
- Size limits are exceeded
-
- It’s a double-storey extension
-
- The design affects neighbouring properties
-
- The property is in a restricted area
Building Regulations approval is always required.
Do You Need Planning Permission for an Extension in Crawley?
Many Crawley homeowners can extend without planning permission under Permitted Development rules. Typically, you may be able to extend:
-
- Up to 3–4 metres for terraced or semi-detached homes
-
- Up to 8 metres for detached homes (subject to conditions)
However, restrictions apply, and it’s always best to check before starting work.
How Long Does a Home Extension Take?
Typical timescales include:
-
- Small single-storey extension: 8–12 weeks
-
- Medium extension: 12–18 weeks
-
- Large or double-storey extension: 16–24+ weeks
Design, approvals and structural complexity can extend timelines.
Why Extensions Are So Popular in Crawley
Home extensions continue to grow in popularity across Crawley because they:
-
- Add valuable living space
-
- Increase property value
-
- Allow families to stay in desirable areas
-
- Create modern, open-plan layouts
-
- Avoid the cost and disruption of moving
With excellent transport links and strong local amenities, Crawley homeowners are choosing to improve rather than relocate.
Final Thoughts
A home extension is a significant investment, but when planned and built correctly, it can transform your Crawley property and add long-term value. Understanding local extension costs in Crawley helps you budget effectively and make informed decisions from the outset.
Working with experienced Crawley builders ensures your project is completed safely, efficiently and in line with current regulations.