About Us


Ethos constructions are kitchen, house and side extension specialist in summerhouse and lofts. We specialize in a wide variety of custom made home improvement projects; designed to expand your space and breathe new life into your home, inside and out. With our services, you could make more room for a growing family or add value to your property listing. Our construction work with your specific needs in mind and our qualified, experienced builders can bring them to life in a matter of weeks.


Our unique business model offers Holland and Green’s clients a number of benefits that has ensured our continued growth and success.


Holland and Green’s client focused systems and procedures ensure our clients can access their most current plans, 3D models and other vital information about their Project at any time through their personal Client Web Page. This allows immediate access whether it’s through your Laptop, Tablet or Smartphone, reducing the need for multiple paper copies and ensuring you are always looking at the most up to date plans.


We will never patronise, ignore or confuse you with jargon – we aim to be approachable, plain speaking and encourage client collaboration and involvement at every stage.


Our commitment to design excellence means our team of Architects, Project Managers and Designers are as excited about your project as you are. While our commitment to environmental impact means we are able to offer clients either ‘Standard’ or ‘Green Build’ packages to suit.


While no two projects are the same, the fact that we do so many residential projects in Oxford and London means we have a clear understanding of what is involved and as such can offer our clients a service allowing you to take on as little, or as much, of our involvement as you choose. We are also well placed to provide likely costs for the building itself.

Better Experience

Our use of the latest technology, immersive 3D design and animation means that our clients get the chance to see how their finished house will look at the earliest stage and as it develops, you will be asked for feedback at every stage and we will work with you to generate a design that you can see in 3D and understand before a single foundation is dug or timber cut.


Our main focus is to make all aspects of this process as smooth as possible. We aim to keep everything from consultation to a finished loft conversion, Extensions, Garage conversions in house to guarantee an easy transition from start to finish and ensure your satisfaction. One of our team specialists will meet with you to discuss all specifications of the loft conversion and answer any questions you may have. Our team will provide a cost effective plan for the project requirements you will have discussed.

Home extensions in London are relatively cost effective and extremely versatile. In the current economical and financial climate, with London house prices continuing to increase, many families are simply priced out of the market for a new property. Fortunately, a home extension at their existing property can provide them with the additional room they need. They can build an improved home without breaking the bank.

Of course, while home extensions are cost effective in comparison to home purchases, they still require a lot of effort and a fair amount of time from the initial site survey to the décor in the finished space. That’s why we pride ourselves on providing the simplest, clearest, most comprehensive home improvement services in around London.

Whether you’re looking for an all-new kitchen, a two-storey rear/side extension or even a full apartment refurbishment, we can help you from beginning to the end. Our third party design consultants draw up designs based on your specifications and ensure that our work is fully compliant with building regulations and council planning. Meanwhile, fixed prices and timescales mean you’ll know exactly what you have to pay and for how long our expert builders will be on site. Get in touch today to start your home extension done