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Our Services

We have been providing our building services in Oxfordshire for over 22 years.

Based in West Oxfordshire, most of our work is in and around the Witney area although we are happy to extend our work radius to accommodate individual projects and clients.

The vast majority of our work comes from word of mouth recommendations and returning customers. This is something as a company we are extremely proud of, as this means our customers are not only happy with the work we have completed for them, but they also want to tell their friends!

We really do strive to make sure you are thrilled with the end result of your projects.

We appreciate for most of our customers having work carried out at their home, although exciting, can also be stressful. We do however try our very best to make sure your project is carried out is a timely manner that is as stress-free as possible. We endeavour to keep you up to date with your projects timeline and progress. Leo applies all possible measures to make sure you are thrilled with your job and sets frequent catch up calls and meetings to keep you fully in the loop.

Below you can read about some of the services our team provide at Onyx Build.

New Builds

New builds or complete renovations are something we are more than capable of as a company. Our own team is able to complete the vast majority of the project and in areas that are more specialised we are able to call upon other local trades whom we have excellent working relationships with.

Garden Rooms and Offices

Since lockdown working from home has become common place in many houses. An outdoor building either attached to your house or self contained is a great way to keep work and home life separate.

Outdoor rooms can also be built for other reasons, such as entertaining friends, having your own private gym or for running a business. Its your space to decide how you want to use it. We have constructed multiple outdoor buildings and this option continues to be a great way of adding more space to your home.

Extensions and Renovations

An ever popular method of updating your living space is to either extend upwards, outwards, or even do both! An extension gives your home a new lease of life and often avoids the need to move. We have a huge amount of experience in both extensions and  renovations and we area able to give ideas and advice to help you decide what you would like done on your own project.

Orangeries and Conservatories

Orangeries and Conservatories continue to be a popular choice. Orangeries tend to be a more modern way to enhance your living space and are something with which we achieve impressive end results.

The possibilities are endless when choosing what you would like, but we will be happy to help and guide you to reach a decision. The end product will be sure to help accentuate your homes individual style and needs.

Garage Conversions

In most modern homes garages are a room used for rarely used storage and thy are often to small to house a vehicle. Converting a garage into a functional  room within your home or in the garden is a fantastic way to increase living space and the value of your home. 

Garages can be converted to a very high standard with all electrical mod cons and plumbing fitted to enhance all of your personal requirements.

Loft Conversions

Clients are always surprised with the amount of space the end result of a loft conversion gives. Conversions can often be a great way to add multiple new rooms to your home without losing any outdoor ground space. Velux windows and Dorma's are also options we can implement to enhance light and space. These can be planned into your project to elevate your living space further. We work closely with architects and structural engineers to make sure we are optimising your living space whilst maintaining your homes integrity.

Garden landscaping and Patios

Patios, decking, and ground remodelling is another area Onyx Build is skilled at. We have a extensive range of option available when it comes to customising your outside space. Whether you want to create a floral Cotswold courtyard or a ultra modern patio for outdoor living we can help you plan and carry out your project.


We have a dedicated Carpentry team employed full time here at Onyx who are very capable and skilled in their work. Customers are always thrilled with the end result.

We pride ourselves in having fantastic connections with many local and national Kitchen companies allowing us access to a huge amount of kitchen and utility design choices.

Kitchens can be completed as part of your renovation project or individually if you just require a new kitchen to be fitted.


A new Bathroom or en suite is another great way to add a new lease of live into your home. We are able to fit bathrooms and shower rooms and have multiple options available for you to choose from. As a company we tend to fit bathrooms only as part of renovation project and not as a singular trade.

Head over to our testimonials page to see what our genuine customers have to say.

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