Expert Extension Builders in Oxford: Transform Your Home with Knights Builders
Looking for professional extension builders in Oxford who can transform your home with skill and precision? Knights Builders Oxford brings over 20 years of expertise to every project, creating beautiful, functional living spaces tailored to your needs. Whether you’re dreaming of a spacious kitchen extension, a stylish loft conversion, or a complete home transformation, our team delivers quality craftsmanship and exceptional service throughout Oxfordshire. Building Quality Extensions You Can Trust.

Trusted Local Extension Builders with 20+ Years Experience
Knights Builders Oxford has established itself as one of the leading extension builders in the region. Our reputation is built on delivering exceptional quality, clear communication, and reliable project management for homeowners across Oxford and surrounding areas.
Why Choose Knights Builders Oxford?
- Over 20 years of extension building experience
- Fully qualified and insured professional builders
- Transparent pricing with no hidden costs
- Excellent communication throughout your project
- High-quality materials and superior craftsmanship
- Comprehensive project management from start to finish
Extension Building Services in Oxford
As experienced extension builders in Oxford, we offer a comprehensive range of building services to help you expand and enhance your home. From initial design consultation to the final finishing touches, our skilled team handles every aspect of your extension project with care and precision.

Single-Storey Extensions
Transform your living space with a beautifully designed single-storey extension. Perfect for creating larger kitchens, open-plan living areas, or additional rooms that seamlessly connect to your garden.
- Kitchen extensions
- Dining room extensions
- Living room extensions
- Home office spaces

Double-Storey Extensions
Maximize your living space with a double-storey extension. Add bedrooms, bathrooms, and living areas while maintaining garden space and significantly increasing your property’s value.
- Master bedroom suites
- Additional bedrooms
- Family bathrooms
- Extended living spaces

Loft Conversions
Unlock the potential of your unused attic space with a professionally designed loft conversion. Create additional bedrooms, home offices, or recreational spaces without extending your property’s footprint.
- Dormer loft conversions
- Hip-to-gable conversions
- Velux/roof light conversions
- Mansard conversions

Garage Conversions
Convert your underused garage into valuable living space. Our garage conversions create seamless transitions from storage to functional rooms that match the quality and style of your home.
- Home offices/studios
- Playrooms
- Guest bedrooms
- Utility rooms

Complete Home Renovations
Transform your entire property with our comprehensive renovation services. From internal reconfigurations to complete property refurbishments, we’ll help you reimagine your living space.
- Internal wall removal
- Kitchen and bathroom renovations
- Flooring and ceiling replacements
- Complete property refurbishments

New Builds
From foundation to finishing touches, our experienced team can construct your dream home to the highest standards. We handle all aspects of new build projects with meticulous attention to detail.
- Custom home designs
- Self-build projects
- Small development projects
- Turnkey solutions
Our Extension Building Process
At Knights Builders Oxford, we follow a structured approach to ensure your extension project runs smoothly from concept to completion. Our transparent process keeps you informed and involved at every stage.

- Initial Consultation – We meet to discuss your vision, requirements, and budget. This helps us understand exactly what you’re looking for in your extension.
- Design & Planning – Our team works with you to develop detailed plans and secure necessary planning permissions for your Oxford property.
- Detailed Quote – We provide a comprehensive, transparent quote outlining all costs involved in your extension project.
- Project Schedule – Once approved, we create a detailed timeline so you know exactly what to expect and when.
- Construction Phase – Our skilled extension builders execute the project with precision, keeping disruption to a minimum.
- Regular Updates – Throughout the build, we maintain clear communication and provide regular progress updates.
- Quality Checks – We conduct thorough quality inspections at key stages to ensure everything meets our high standards.
- Project Completion – Final inspections are carried out before we hand over your beautifully completed extension.
“Knights Builders Oxford managed our kitchen extension project with exceptional professionalism. From the initial design consultation to the final finishing touches, their attention to detail and communication was outstanding. We couldn’t be happier with our new space.”
Extension Builders Serving Oxford and Surrounding Areas
Knights Builders Oxford provides professional extension building services throughout Oxford and the surrounding Oxfordshire areas. Our local knowledge ensures we understand the specific planning requirements and architectural styles of different neighborhoods.
Areas We Cover in Oxford
- Summertown
- Headington
- Jericho
- Cowley
- Botley
- Marston
- Iffley
- Wolvercote
- Cutteslowe
- Grandpont
Surrounding Oxfordshire Areas
- Abingdon
- Kidlington
- Witney
- Bicester
- Thame
- Didcot
- Wantage
- Wallingford
- Woodstock
- Wheatley
Not sure if we cover your area? Contact our team today to discuss your extension project requirements.
Planning Permission for Your Oxford Extension
Understanding planning regulations is a crucial part of any extension project. As experienced extension builders in Oxford, we guide you through the entire planning process to ensure your project complies with local requirements.

When Planning Permission Is Required
While some extensions fall under permitted development rights, others require formal planning permission. You’ll likely need planning permission if your extension:
- Covers more than half the land around your original house
- Extends toward a road
- Increases the height of the building
- Extends more than 6m from the rear of an attached house
- Extends more than 8m from the rear of a detached house
- Is in a conservation area or listed building
Our Planning Permission Support
Knights Builders Oxford provides comprehensive planning support:
- Initial assessment of planning requirements
- Preparation of detailed architectural drawings
- Submission of planning applications
- Liaison with local planning authorities
- Management of building regulations approval
- Handling of any planning complications
Expert Tip: Oxford has several conservation areas with stricter planning controls. Our local knowledge helps navigate these requirements efficiently, saving you time and potential complications.
Frequently Asked Questions About Extension Building
The timeline for extension projects varies depending on size, complexity, and specific requirements. As a general guide:
- Single-storey extensions: 8-12 weeks
- Double-storey extensions: 12-16 weeks
- Loft conversions: 6-8 weeks
- Garage conversions: 3-6 weeks
During your initial consultation, we’ll provide a more accurate timeline specific to your project.
Yes, in most cases you can continue living in your home while we build your extension. We take measures to minimize disruption, including:
- Creating dust barriers between living areas and construction zones
- Maintaining essential services throughout the build
- Scheduling noisy work during appropriate hours
- Regular cleaning of work areas
For extensive renovations, we’ll discuss any periods where alternative accommodation might be beneficial.
Extension costs vary based on size, specification, and complexity. As a rough guide for Oxford properties:
- Single-storey extensions: £1,500-£2,000 per square meter
- Double-storey extensions: £1,800-£2,500 per square meter
- Loft conversions: £30,000-£50,000 total
- Garage conversions: £10,000-£25,000 total
We provide detailed, transparent quotes following our initial consultation and site assessment.
Yes, Knights Builders Oxford provides a comprehensive service covering all aspects of your extension project, including:
- Architectural design and planning
- Structural engineering
- Planning permission applications
- Building regulations compliance
- All construction work (foundations, walls, roofing, etc.)
- Plumbing and electrical installations
- Plastering, decorating, and finishing
- Final inspections and certification
This full-service approach ensures seamless project management and consistent quality throughout.
Absolutely. All our extension builders are fully qualified tradespeople with extensive experience in their respective fields. Knights Builders Oxford carries:
- Comprehensive public liability insurance (£5 million cover)
- Employer’s liability insurance
- Professional indemnity insurance
We’re also members of relevant trade associations and all work is completed to current building regulations standards.
What Our Clients Say About Our Extension Building Services
“Knights Builders Oxford transformed our home with a stunning kitchen extension. Their attention to detail was exceptional, and they kept us informed throughout the entire process. The team was professional, tidy, and completed the work on schedule. We couldn’t be happier with our new space.”
David & Emma Wilson
Summertown, Oxford
“We hired Knights Builders for our loft conversion after seeing their work on a neighbor’s property. From planning to completion, they were professional, knowledgeable, and reliable. They navigated the planning process expertly and delivered a beautiful new bedroom and en-suite that has transformed our home.”
James Thompson
Headington, Oxford
“Our double-storey extension was a significant investment, and Knights Builders made the process as smooth as possible. Their craftsmanship is outstanding, and they were flexible when we needed to make changes. The project was completed on budget, and the team was a pleasure to work with.”
Sarah & Michael Brown
Cowley, Oxford

Contact Our Extension Builders Today
Ready to discuss your extension project? Complete the form below or call us directly to arrange your free consultation with our experienced team of extension builders in Oxford.
Get In Touch
Prefer to speak with us directly? Contact our friendly team using the details below:
Email: info@knightsbuildersoxford.co.uk
Office Hours:
Monday to Friday: 8am – 6pm
Saturday: 9am – 1pm
Sunday: Closed
Free Consultation Offer
Book your no-obligation consultation today and receive:
- Expert assessment of your property
- Practical design suggestions
- Detailed cost estimate
- Planning permission guidance
Why Choose Knights Builders for Your Oxford Extension Project

With over 20 years of experience as trusted extension builders in Oxford, Knights Builders Oxford combines craftsmanship, reliability, and exceptional customer service to deliver extensions that exceed expectations. Our commitment to quality and attention to detail ensures your project is completed to the highest standards, on time and within budget.
From initial concept to final handover, we work closely with you to create beautiful, functional spaces that enhance your lifestyle and add value to your property. Our transparent approach, clear communication, and dedication to excellence have made us one of Oxford’s most respected building companies.