House Extensions in Poole: A Complete Homeowner Guide
House extensions are one of the most popular home improvement projects across Poole and the wider Dorset area. With rising property prices and limited availability of larger homes, many homeowners are choosing to extend rather than move.
From Parkstone and Canford Heath to Broadstone, Oakdale and Hamworthy, extensions are helping families gain extra space, improve layouts and add long-term value. This guide explains everything you need to know before starting a house extension in Poole.
Why House Extensions Are So Popular in Poole
Poole’s housing stock includes a wide mix of traditional homes, post-war properties and modern developments. Many were not designed for today’s lifestyles, where open-plan living, home offices and flexible family space are in high demand.
A well-designed extension allows you to:
- Increase living space without relocating
- Improve natural light and flow
- Modernise layouts
- Add value to your property
- Stay in your preferred area
For many homeowners, extending is significantly more cost-effective than moving when stamp duty, legal fees and moving costs are considered.
Do You Need Planning Permission for an Extension in Poole?
Many house extensions fall under Permitted Development (PD), meaning planning permission is not required — provided the extension meets specific size and design criteria.
In general, permitted development may apply if:
- The extension stays within size limits
- It does not overly impact neighbouring properties
- Materials are in keeping with the existing house
- The property is not listed or in a restricted area
However, planning permission will be required for larger extensions, flats, listed buildings or homes in conservation areas.
Reference:
UK Government Permitted Development guidance – https://www.gov.uk/planning-permission-england-wales
A professional builder will assess this early and advise whether a full planning application is needed.
How Much Does a House Extension Cost in Poole?
Extension costs vary depending on size, design and specification. As a general guide:
- Single-storey extension: £1,800–£2,500 per m²
- Double-storey extension: £2,200–£3,000 per m²
- High-spec finishes or complex builds: Higher ranges
Costs are influenced by:
- Groundworks and foundations
- Structural steel requirements
- Roofing and glazing
- Internal finishes and layout changes
A detailed, itemised quote is essential to understand exactly what’s included.
How Long Does a House Extension Take to Build?
Typical build times for house extensions in Poole are:
- Single-storey extensions: 8–12 weeks
- Double-storey extensions: 12–16+ weeks
This does not usually include planning or design time. Weather, access and structural complexity can also affect timelines.
Design Considerations for Coastal & Dorset Homes
Homes in Poole often benefit from designs that maximise light and connect indoor and outdoor space. Popular features include:
- Bi-fold or sliding doors
- Roof lanterns and skylights
- Open-plan kitchen-diners
- Energy-efficient glazing
- Durable materials suited to coastal conditions
Good design is not just about appearance — it improves comfort, energy efficiency and long-term usability.
Building Regulations & Structural Compliance
All extensions must comply with UK Building Regulations, covering:
- Structural integrity
- Fire safety
- Insulation and energy efficiency
- Drainage and ventilation
Structural changes such as wall removal require RSJ (steel beam) installation, designed by a structural engineer.
Reference:
UK Building Regulations – https://www.gov.uk/building-regulations-approval
A reputable builder will manage this process and ensure inspections are completed.
Why Choosing the Right Builder Matters
A house extension is a major investment. Choosing a local, experienced builder helps ensure:
- Accurate local planning advice
- Familiarity with Poole property types
- Reliable timelines
- Clear communication
- Work built to last
Using one builder for the full project also avoids delays caused by coordinating multiple contractors.
Is a House Extension Worth It in Poole?
In most cases, yes. A professionally built extension can add 10–20% to a property’s value, depending on size, location and finish.
More importantly, it improves how your home works day to day — which is why so many homeowners choose to extend rather than move.