Hampshire · West Sussex · Wiltshire · Dorset
House Extensions
Hampshire
Beautifully designed house extensions across Hampshire, Wiltshire, Dorset, and West Sussex,
from single-storey additions to full wrap-around builds, finished to the highest standard.
Get a free quote — we’ll call you back.
Who We Are
Home Extension Builders Hampshire Homeowners Trust
Hampshire Building is a design-led team of house extension builders working with homeowners across Hampshire and into Wiltshire, Dorset, and West Sussex. If you’re planning a home extension, whether that’s extending a kitchen, creating an open-plan living space, or making better use of underused space at the rear of your property, we manage the entire process in-house. There’s no subcontracting, and no disappearing mid-project.
As extension builders in Hampshire, we work the way an architectural practice does. Drawings, detailing, and finish are considered from the very first conversation, not added as an afterthought once the build begins.
We take care of structural design, planning applications, and party wall agreements where required, so before a single brick is laid, you understand exactly what your extension involves, what it will cost, and how long it will take.
The full package
What's Included in Our House Extension Service
From the first site visit through to the final snag, every Hampshire Building Co. house extension is managed in full. One team, one point of contact, no hidden extras.
- Initial site survey and feasibility assessment
- Planning application support and liaison
- Structural design and engineering calculations
- Party wall agreement support, where required
- Groundworks and foundations
- Brickwork, blockwork, and timber frame as appropriate
- Roof structure, weatherproofing, and insulation
- Windows, doors, and glazing installation
- First and second fix, plumbing, electrics, plastering
- Flooring, joinery, and final finishes
Why Choose Us as Your Extension Builders in Hampshire
There are plenty of extension builders across Hampshire. We manage your entire extension in-house, from survey to handover, with no subcontractors turning up unannounced. Design is planned from day one, the way an architectural practice works, with detailing and finish considered from the first conversation. Prefer to speak with someone directly? Call us on 07359 222 643.
We only take on work we can be proud of. That means a realistic timeline, an honest quote, and a team that turns up when they say they will. No surprises. Just a beautifully finished extension.
What to Consider Before You Extend
Before starting a house extension, it’s worth understanding a few things that will shape your project.
Planning permission vs. permitted development.
Some extensions fall under permitted development rights and don't require a full planning application, while others do. This depends on the size, position, and design of your extension. We'll advise you on which applies before any drawings are produced.
Party wall agreements.
If you're extending close to a neighbouring boundary, a party wall agreement may be required before work can begin. We manage this process and the correct notices on your behalf.
Single-storey vs. double-storey
A double-storey extension involves more structural work and a longer build programme than a single-storey addition, which affects both cost and timescale. It's worth factoring this in early when deciding what's realistic for your budget.
How the extension connects to your existing home?
The best extensions are designed to feel like part of the original house, not an obvious add-on. This means considering rooflines, brick matching, and how natural light moves through the new space, not just the square footage being added.
The full package
Explore Our Other Services
Structural Works
Load-bearing work, RSJs, and structural alterations carried out safely and to specification.
Home Renovations
Full internal transformation, from layout changes through to the finishing touches.
Home Extension Builders Across Hampshire & Beyond
Christchurch, Ringwood, Fordingbridge, Salisbury, Andover, Winchester, Alresford, Alton, Petersfield, Midhurst, Chichester, Emsworth, Fareham, Bishops Waltham, Romsey, Chandler’s Ford
- Christchurch
- Ringwood
- Fordingbridge
- Salisbury
- Andover
- Winchester
- Alresford
- Alton
- Petersfield
- Midhurst
- Chichester
- Emsworth
- Fareham
- Bishops Waltham
- Romsey
- Chandler's Ford
Not sure if we cover your area?
Frequently Asked Questions
Cost depends on size, specification, and site conditions. Without seeing the project, any figure would be a guess. The only way to get an accurate quote for your specific extension is a site visit.
Quite often not. Many single-storey extensions fall under permitted development rights, so full planning permission is not always required. It depends on the size of the extension, your property type, and whether there are any local restrictions in place, such as a conservation area. It is worth checking with your local council, or getting in touch with us if you want a steer on your specific plans.
Generally yes, particularly extensions that add genuine living space or an extra bedroom. How much value depends on your local property market and how well the finished space is designed and built, which is part of why we treat design and detailing as seriously as the build itself.
It helps to think in two phases. Design, detailing, and any planning work comes first, then the build itself. A single-storey extension typically runs between 10 and 16 weeks on site once work starts. We will always give you a realistic timeline specific to your project once we have seen it.
In most cases, yes, especially with single-storey work where the disruption tends to be contained to one area. Larger or double-storey projects sometimes mean a bit more upheaval, but we will talk you through exactly what to expect before work starts.
Not always. Because we take a design-led approach, drawings, detailing, and finish are considered from the very first conversation. A lot of that thinking is built into how we work rather than needing to be handled separately by an architect.
Word of mouth and recommendations are always worth a lot, but it is also worth looking at how thoroughly a builder talks through the design with you, not just the price. If you are based in Hampshire’s villages and market towns, we are happy to have that conversation and see whether we are the right fit for your project.
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Serving Hampshire, Wiltshire, Dorset & West Sussex
