Home Extensions in Oxford
When your family outgrows your home but you love where you live, a well-built extension is often the smartest move, adding space, light and lasting value without the cost and upheaval of moving. At Crawford Construction, we design and build home extensions across Oxford and Oxfordshire, managing the whole project under one roof: design, planning permission, building regulations, structural work and finishing.
With over 10 years of experience extending Oxford’s Victorian terraces, period semis and modern family homes, we know the local planning landscape and the construction challenges that come with the city’s older housing stock.
Home Extensions Oxford by Crawford Construction
Expertise You Can Trust
At Crawford Construction, our team of highly skilled builders and designers brings decades of combined experience to every project. From concept to completion, we ensure your home extension is completed to the highest standard.
Tailored Solutions
Your home is as unique as you are. Whether you’re looking to add a modern kitchen, expand your living area, or create a home office, we tailor every detail to match your lifestyle and preferences.
On-Time, On-Budget Delivery
We respect your time and budget. Our streamlined project management ensures every extension is completed efficiently, with no hidden costs or delays.
Compliance with Oxfordshire Regulations
We handle all aspects of planning and building regulation compliance. Rest easy knowing your project meets all local requirements.
Eco-Friendly Options
Choose sustainable materials, energy-efficient designs, and eco-friendly construction methods to reduce your environmental impact and save on energy bills.
Types of Home Extensions We Build in Oxford
Every home and budget is different, so we build the full range of extension types and advise on which gives you the best space and value for your property.
Custom Home
Extensions in Oxford to Fit Your Lifestyle
Side Return & Wraparound Extensions
Side return extensions make use of the often-wasted alley space beside Victorian and Edwardian terraces, a classic Oxford property type. A wraparound extension combines a rear and side extension into an L-shape for a dramatic increase in ground-floor space. Wraparounds almost always require full planning permission.
Single-Storey Rear Extensions
The most popular choice in Oxford, ideal for opening up the back of the house to create a large kitchen-diner or open-plan living space. Often achievable under permitted development, single-storey rear extensions can extend up to 3m on a terraced or semi-detached home, or 4m on a detached home, without full planning permission.
Kitchen Extensions
A kitchen extension is one of the highest-return improvements you can make, often combined with bi-fold or sliding doors, roof lanterns and skylights to flood the space with natural light and connect the home to the garden.
Double-Storey (Two-Storey) Extensions
Adding two floors gives you extra living space downstairs and an additional bedroom or bathroom above, and it's the best value per square metre because the foundations and roof are shared across both floors. Ideal for growing families who need bedrooms as well as living space.
Over-Structure & Garage Conversions with Extensions
Extending over an existing single-storey structure, or combining a garage conversion with a small extension, can unlock space without expanding your footprint.
Some of our clients:
How Much Does a House Extension Cost in Oxford?
Costs depend on size, specification, ground conditions and your property, but as a general 2026 guide for the Oxford area:
- Single-storey extensions: typically £2,000–£3,000 per square metre
- Double-storey extensions: better value per square metre, as foundations and roof are shared
- Typical single-storey project: often falls in the £30,000–£60,000 range depending on size and finish
Oxford and the wider South East tend to sit at the higher end of UK pricing. Factors that affect your final cost include foundation depth, steel beams (RSJs), glazing and bi-fold doors, kitchen and bathroom fit-out, and access to the rear of the property.
The only accurate figure is a written quote based on a site visit, which we provide free of charge with a clear, itemised breakdown of materials, labour and scope, so there are no hidden costs.
Do I Need Planning Permission for an Extension in Oxford?
Many extensions fall under permitted development rights and don’t need full planning permission, but this depends on your property and location. As a guide:
- Single-storey rear extensions: usually permitted up to 3m (terraced/semi-detached) or 4m (detached)
- Larger Home Extension Scheme: extensions up to 6m or 8m may be possible via a prior approval application with neighbour consultation
- Double-storey and wraparound extensions: usually require full planning permission
- Conservation areas, listed buildings and Article 4 areas: stricter rules apply, and Oxford has many conservation areas and period properties
We handle the entire planning and building regulations process for you, including drawings, applications, structural calculations, building control sign-off and party wall agreements where needed. We’ll advise from day one whether your project is permitted development or needs a planning application.
Most home extensions take between 8 and 16 weeks depending on complexity and scope. A double-storey or wraparound extension takes longer than a simple single-storey rear extension. We provide a clear timeline at consultation stage.
Many single-storey extensions fall under permitted development, but double-storey, wraparound and extensions in conservation areas or on listed buildings usually need planning permission. We assess this for you upfront.
As a 2026 guide, single-storey extensions in Oxford typically start from around £2,000–£3,000 per square metre. We provide a free, itemised written quote after a site visit.
Absolutely! We provide sustainable building materials, energy-efficient insulation, and renewable energy solutions to create environmentally friendly extensions.
In most cases yes, especially for rear and side extensions. Kitchen works are the most disruptive. We plan the build to minimise disruption to your daily life.
A well-designed extension, particularly extra bedrooms, open-plan kitchens and light-filled living space, can significantly increase your property's market value and appeal.
Yes. We manage drawings, planning applications, building regulations, structural calculations and party wall agreements from start to finish.
Yes. We have extensive experience with Victorian and period properties and listed buildings, working sympathetically with original features and conservation requirements.
Yes. We offer sustainable materials, high-performance insulation and energy-efficient designs to reduce your environmental impact and energy bills.
Serving Oxford and Surrounding Areas
We proudly serve various neighbourhoods across Oxford and Oxfordshire, including:
- Summertown
- Headington
- Jericho
- Cowley
- Iffley
- Botley
- Marston
- East Oxford
- Wolvercote
- North Oxford
- Littlemore
- Abingdon
- Kidlington
- Thame
- Witney
- Bicester
- Didcot
