How Much Does a Home Extension Cost in Worthing? 2025 Local Pricing Guide

A home extension is one of the most effective ways to add space and long-term value to your property — especially in Worthing, where demand for modern open-plan living continues to rise. Whether you’re in Goring-by-Sea, Broadwater, Salvington, Durrington or West Worthing, extending your home can transform the way you live without the cost and disruption of moving.

This guide breaks down the typical cost of home extensions in Worthing in 2025, the factors that influence pricing, and what you should consider before starting your project.

 

---

 

1. Typical Extension Costs in Worthing (2025)

Extension prices vary depending on the size, design, materials and complexity of the build. Here are average ranges for Worthing homeowners:

Single-Storey Extension

£1,800 – £2,500 per m²
Ideal for open-plan kitchens, dining rooms and extended living areas.

Double-Storey Extension

£2,200 – £3,200 per m²
A cost-effective way of adding significant extra space across two floors.

Side or Rear Extensions

£30,000 – £60,000+
Common across Worthing’s family homes, particularly where garden space is available.

Wrap-Around Extensions

£55,000 – £95,000+
Creates major ground-floor transformation with large open-plan designs.

These figures vary depending on structural needs, glazing choices, finish quality and ground conditions.

 

---

 

2. What Affects Extension Costs in Worthing?

1. Property Type

Worthing has a diverse mix of housing — from Victorian terraces in West Worthing to 1930s semis in Broadwater and modern homes in Goring. Older homes may require additional structural work.

2. Materials & Design

Higher-end finishes, bifold doors, skylights and bespoke layouts can increase costs.

3. Ground Conditions

Coastal and clay-based soil in parts of Worthing can impact foundation requirements.

4. Planning Requirements

Homes in conservation areas or certain coastal zones may need extra permissions and design considerations.

5. Size & Complexity of the Project

Larger extensions naturally require more labour, time and materials.

 

---

 

3. Do You Need Planning Permission in Worthing?

Many extensions fall under Permitted Development, meaning no planning permission is required if the design meets specific height and size rules.

However, permission may be needed if:

• • The extension exceeds PD limits

• • You live in a conservation area

• • Your home is listed

• • The design significantly alters the external appearance

• • You plan a double-storey or wrap-around extension

Working with a local builder familiar with Worthing Borough Council’s planning rules can speed up the process.

 

---

 

4. How Long Does an Extension Take to Build?

Timelines vary, but typical build durations for Worthing projects include:

• • Small single-storey extension: 8–12 weeks

• • Medium extension: 12–18 weeks

• • Larger or double-storey extension: 16–24+ weeks

Additional time should be allowed for planning, architectural drawings and structural engineering.

 

---

 

5. Why Extensions Are Popular in Worthing

With rising property prices and limited space to expand in some areas, extensions remain a smart investment for local homeowners.

Benefits include:

• • Increased living space

• • Higher property value

• • Modern open-plan layouts

• • Better natural light

• • Cheaper and easier than moving

Extensions are especially popular in areas like Goring, High Salvington, Broadwater and Durrington.