over 1,000 satisfied customers

House Extension

s

in Oxford, Designed Around You

Need more space without moving? A house extension adds valuable square footage and increases the functionality of your home. Whether it’s a rear, side, or double-story extension, we design and build with precision to blend seamlessly with your existing property.

Whether you're extending, converting, or renovating, no job is too big or small. As one of the trusted Oxford general builders, we can handle everything from design to completion, making the process simple and stress-free.

benefits

Why a

House Extension

in Oxford Could Be Perfect for You

fully managed Service

Your

House Extension

in Oxford, Without the Stress

Taking on a
House Extension
can feel overwhelming. At Kingdom, we make it easy by offering a fully managed service, handling everything from design to final completion.
One Team, One Contact
No chasing contractors. You’ll have a single point of contact who keeps you updated from start to finish.
Designed Around Oxford Living
We design with your lifestyle in mind, creating a space that works beautifully for everyday family life.
Attention to Detail
From planning to finishing touches, we handle everything carefully so your build feels simple, not stressful.

Types of build

House Extension

s We Offer in Oxford

Not every home is the same. We’ll help you choose the right style to maximise space, comfort, and value.
Most Cost Effective
Double-Storey Extension
  • Adds two levels at once
  • Increases bedroom and downstairs space
  • Often a cost-effective long-term solution
Orangery Extension
  • Blends solid structure with glazed roofing
  • Ideal for year-round entertaining, dining
  • A light-filled retreat
Over-Structure Extension
  • Builds above existing areas like a garage
  • Doesn't take up additional garden space
Rear Extension
  • Extends your home into the garden
  • Perfect for expanding kitchens, living rooms, or creating open plans.
Side Return Extension
  • Utilises the narrow alley beside your home
  • Often transforming dark kitchens into bright, spacious areas.
Wraparound Extension
  • Combines side and rear extensions
  • Dramatically increase spaces
  • Completely reshape the ground floor

How can we help?

Why Choose Kingdom for Your home?

Choosing the right builder isn’t just about the final result. It’s about the experience along the way. We understand that House Extensions can be disruptive, which is why we do everything we can to make the process smooth and stress-free.

From keeping your home as tidy as possible to ensuring clear communication at every stage, we take care of the details so there are no surprises. With Kingdom, you can expect a well-managed loft conversion project, minimal disruption, and a space you’ll love at the end of it.

“Absolutely delighted with our new build in the Cotswolds. The craftsmanship and attention to detail are second to none. The team were professional, approachable, and genuinely cared about getting everything just right. Couldn’t recommend them more highly."

Charlotte B

,

Chipping Norton

"We had a large extension done on our Oxford home and the whole experience was smooth from start to finish. The builders were tidy, respectful, and always kept us in the loop. Five stars without hesitation."

James T

,

Summertown, Oxford

"Exceptional service and a stunning finish. They transformed our dated cottage into a beautiful, modern space while keeping its original character intact. The team’s knowledge of period properties really stood out."

Emily R

,

Burford

Frequently Asked Questions about

House Extension

If you have any additional questions or need further clarification on something, please feel free to contact us.

How can I make sure my extension adds value?

If resale value is a priority, speak with a local estate agent before building. They can help you understand the potential uplift in your property’s value if you increase its size. In most cases, adding a bedroom or creating a larger kitchen-diner makes a home more appealing to buyers. Orangeries are also a strong investment—they combine extra space, natural light, and beautiful design, making your home more desirable.

Can I extend my home if I’ve already extended before?

Yes, but additional extensions may require full planning permission depending on past works. Our planning team can check your home’s extension history and advise on your options—ensuring everything stays compliant from the start.

Do you offer a warranty on your work?

Yes, all of our work is backed by a workmanship guarantee, ensuring quality and durability. We also ensure that all work meets current building regulations.

How much value will a house extension add to my home?

It depends on your location, the type of extension, and current market trends. As a rough guide:

A single-storey extension can add 5–8%

A double-storey extension may boost value by up to 12%

Adding a bedroom or a larger kitchen-diner often brings the biggest returns.

Orangeries, open-plan layouts, and well-integrated spaces are especially attractive to buyers. To get an accurate picture, speak with a local estate agent before building—they’ll estimate the potential new value based on comparable properties. Kingdom Design & Build can then help you design with that value in mind, so every square metre works harder for your investment.

Will I need to move out during the build?

Not necessarily. Many families live at home throughout, especially for rear or side extensions. But expect dust, noise, and limited access to key areas like the kitchen. For major renovations or if your water/electricity is shut off for long periods, temporary accommodation might be wise.

How long does a house extension take?

Most single-storey extensions take around 4–8 weeks once construction begins (depending on the size). Add design, planning, and approval stages, and you're looking at 4–6 months from idea to completion. Double-storey builds take longer. The more complex the project, the longer the timeline, so factor in time for decisions, weather, and unexpected delays.

Do I need an architect or structural engineer?

Yes. Good design and structural safety are essential. Whether you're planning a creative open-plan layout or removing load-bearing walls, Kingdom Design & Build provides in-house architects and structural engineers to ensure your plans are both beautiful and compliant.

How much does a house extension cost in Oxford?

Costs vary widely. On average:

£1,800–£2,500 per m² for standard finishes

£2,500–£3,500 per m² for high-end or complex builds

So a 20m² extension might cost £36k–£70k+. This excludes design fees, VAT, and possible planning costs. A clear, itemised quote from your builder is essential.

Our team at Kingdom Design & Build offers transparent quotes and can help optimise your budget without compromising on quality.

Do I need planning permission for a house extension?

Not always. Many extensions fall under Permitted Development Rights, meaning no planning permission is needed—if you meet size and design limits. Rear extensions up to 6 metres (or 8 for detached homes) often qualify. But exceptions apply in conservation areas, flats, or if your home has been extended before. Always check with your local planning authority.

certified professionals
Our builders are certified professionals, ensuring top-notch quality and safety in every project.
Fully insured
We are fully insured to carry out all aspects of building and construction work.
Warranty Included
Every project we undertake is backed by a comprehensive warranty, ensuring peace of mind.
Price Transparency
Transparent quotes with clear updates if anything changes in the design or build process.

Let's get your project started

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