How Much Does a Home Extension Cost in Eastbourne? | 2026 Local Pricing Guide
With property prices remaining strong and fewer homeowners choosing to move, many people in Eastbourne are opting to extend their homes instead. A well-designed home extension can provide valuable extra living space, improve layout and add significant long-term value — but understanding current extension costs in 2026 is essential before starting any work.
This guide explains how much a home extension costs in Eastbourne in 2026, what affects pricing, the different extension options available, and how to budget realistically in today’s market.
Average Home Extension Costs in Eastbourne (2026)
Extension costs vary depending on size, complexity and finish. As a general guide, homeowners in Eastbourne can expect the following 2026 price ranges:
- Single-storey extension: £1,900 – £2,600 per m²
- Double-storey extension: £2,100 – £2,900 per m²
- Rear extension: £35,000 – £65,000+
- Side extension: £40,000 – £75,000+
- Wrap-around extension: £60,000 – £110,000+
These figures reflect current labour rates, material costs and demand levels in 2026. Final pricing will always depend on design, specification and site conditions.
What Affects the Cost of a Home Extension in Eastbourne?
1. Size and Design Complexity
Larger extensions cost more overall, but layout also plays a major role. Simple open-plan designs are generally more cost-effective than layouts with multiple rooms, bathrooms or complex structural alterations.
2. Type of Extension
Different extension styles have different cost implications:
- Single-storey extensions – Lower overall build cost and shorter construction time
- Double-storey extensions – Higher upfront cost but better value per square metre
- Wrap-around extensions – Maximum transformation, higher complexity and price
3. Ground Conditions and Foundations
Groundworks can significantly affect costs, particularly if:
- Deeper foundations are required
- Existing drainage needs relocating
- Ground conditions are poor
Eastbourne’s varied ground conditions make a proper site assessment essential before finalising budgets.
4. Structural Alterations
Most extensions involve structural work, such as:
- Removing load-bearing walls
- Installing steel beams (RSJs)
- Altering roof structures
These works increase complexity but are often necessary to achieve modern, open-plan living.
5. Specification and Finishes
Internal finishes can dramatically affect final cost, including:
- Flooring and tiling choices
- Kitchen units and appliances
- Bathroom fittings
- Windows, doors and glazing
In 2026, many homeowners opt for mid-range finishes to balance quality, durability and cost.
Do You Need Planning Permission for an Extension in Eastbourne?
Many extensions fall under Permitted Development, meaning planning permission may not be required if size and design limits are met.
Planning permission is more likely to be required for:
- Double-storey extensions
- Extensions close to boundaries
- Side or front extensions
- Properties in conservation areas
Eastbourne includes several conservation areas, so it’s important to check local planning rules early. Regardless of planning permission, Building Regulations approval is always required.
Single-Storey vs Double-Storey Extensions (2026 Comparison)
Single-Storey Extensions
- Lower upfront cost
- Faster build time
- Ideal for kitchens, dining areas and family rooms
Best suited to homeowners improving layout rather than adding bedrooms.
Double-Storey Extensions
- Higher initial investment
- Better value per square metre
- Adds bedrooms and bathrooms
Often the better long-term solution for growing families.
How Long Does a Home Extension Take?
Typical build times in 2026 include:
- Single-storey extension: 8–12 weeks
- Double-storey extension: 12–20 weeks
Timescales vary depending on design complexity, weather and material availability.
How Much Value Can an Extension Add in Eastbourne?
A well-designed extension can add 15–25% to a property’s value, particularly when it:
- Improves layout and flow
- Adds bedrooms or bathrooms
- Creates modern open-plan living space
In Eastbourne’s competitive coastal property market, extensions remain one of the strongest value-adding home improvements in 2026.
Budgeting Tips for a Home Extension in 2026
To keep your project on track:
- Clearly define your requirements early
- Allow a 10–15% contingency for unexpected costs
- Prioritise layout and structure over luxury finishes
- Request detailed, itemised quotes
- Work with an experienced local builder
Good planning is the key to avoiding delays and budget overruns.
Why Use a Local Eastbourne Builder for Your Extension?
A local builder offers:
- Knowledge of Eastbourne housing styles and coastal considerations
- Familiarity with current planning expectations
- Reliable project management from start to finish
- Access to trusted local trades and suppliers
Local experience ensures your extension is delivered efficiently, safely and to a high standard.
Final Thoughts
Understanding home extension costs in Eastbourne in 2026 is an essential first step before starting any building project. While prices vary depending on size and specification, careful planning and professional advice can help you achieve excellent results within your budget.
Whether you’re extending to gain space, improve functionality or add long-term value, a well-planned home extension with a local builder remains one of the most effective property improvements available.