Sustainable Building and Carpentry Services in and around Bristol


What We Do

Home Extensions & Outdoor Living Spaces

Loft Conversions

Convert your attic space into bedrooms or studios. Planning permission is not normally required. We will talk you through the process and work with your architect to create a bespoke package to fit your needs.


An excellent way to add value to your property. We will project manage the build, working with your local planner and architect and our trusted group of local electricians, plumbers painters etc., to produce a high quality, high spec extension to your home.

Knock throughs

Embrace open plan living. Remove structural walls and add space and light to your home. We will talk you through the process, arrange for a structural engineer if necessary and help you transform your home!



I am a skilled Carpenter and Builder with over 10 years’ experience in Britain, France, Australia, New Zealand and the Pacific Islands in both the private and commercial sectors. My background is in renovations, conversions, carpentry and extensions, however I am also a qualified Passive Haus tradesperson and am passionate about sustainable, energy efficient building.

Greenhorn Homes is a combination of my experience, skill and passion to offer a reliable, affordable and eco-friendly building and carpentry service to the local area in and around Bristol.

With a strong commitment to quality craftsmanship and working with local suppliers, Greenhorn Homes offers a range of services from doors and floors to kitchens, extensions and conversions.

I offer a ‘free quote’ service for those of you who are thinking of making changes and need a bit of help or advice. I’m always happy to answer any of your questions so feel free to give me a ring..





A Passive House is a building, for which thermal comfort (ISO 7730) can be achieved solely by post-heating or post-cooling of the fresh air mass, which is required to achieve sufficient indoor air quality conditions – without the need for additional recirculation of air.


Designed to be Bright, Warm and Comfortable.

90% Reduction in heating and energy bills, no radiators needed.

Retrofitting to PassivHaus Standard.

Click here for more info.

For a building to be considered a Passive House, it must meet the following criteria:

1. The Space Heating Energy Demand is not to exceed 15 kWh per square meter of net living space (treated floor area) per year or 10 W per square meter peak demand.
2. The Primary Energy Demand, the total energy to be used for all domestic applications (heating, hot water and domestic electricity) must not exceed 120 kWh per square meter of treated floor area per year.
3. In terms of Airtightness, a maximum of 0.6 air changes per hour at 50 Pascals pressure (ACH50), as verified with an onsite pressure test (in both pressurized and depressurized states).
4. Thermal comfort must be met for all living areas during winter as well as in summer, with not more than 10 % of the hours in a given year over 25 °C.

How did PassiveHaus start?

A German physicist was looking to build his own house. After looking at the way we build houses, he set about understanding the science of what makes an energy effect building. And created the Passive Haus standard. Which is an independent, non-for profit and open sourced institute.

The first houses built to Passivhaus standard were completed in 1991, and since then over 10,000 houses, schools, offices etc have been constructed to the standard in Europe, USA and many other parts of the world. There has been extensive monitoring of Passivhaus buildings which has demonstrated conclusively that they deliver what they promise. The design specifies that heating load should be no more than 15 kWh/m2/year, and the data confirms this. Of course there is a range, depending on lifestyle, but studies have repeatedly shown that the median value is always at the design figure. (the green building store)


‘It saves up to 90 percent of the building’s overall energy consumption when compared to a standard house constructed to current building regulations’. (Federation of Master Builder)

The tried and tested Passive House approach is widespread in Germany and Austria. The first Passive House project was built in Germany in 1990 and there are now an estimated 30,000 Passive Houses across Europe.

The Passive House Institute (PHI) was founded in 1996 by the concepts cocreator, Professor Wolfgang Feist. Based in Darmstadt, Germany the Institute has developed the Passive House Standard through extensive research and monitoring of thousands of Passive House projects





Check Out Our Testimonials!


Craig was the perfect man for the job, neat, punctual, trustworthy and communicative throughout the build. The finished product looks great and I’m happy to say that Craig finished the job in a timely manner so I can now work from home just in time for our new baby. Craig was also very competitively priced and had no problems accommodating any last minute changes to our initial quote. Craig is a nice, friendly guy, with a can do attitude who’s attention to detail means that I would use him again for any further projects at the drop of a hat.

Conversion Of Conservatory Into Permanent Room

Craig started the work within a week of giving us a comprehensive quote. He was professional throughout and kept us up to date with regards to the other contractors involved in the build of the extension. He was aware that with twins on the way we wanted the work done in a timely way and didn’t disappoint. Friends have asked for his details having seen his work. We will certainly use Craig again if considering any other work and would recommend him to others.

Kitchen Fitting

Craig did a fantastic job on a difficult kitchen installation. He listened to us and what we wanted, but more importantly when the going got a little sticky came up with some great ideas that were creative, time and ultimately money saving. He showed up when he said he would, did what he said he would do and filled us with confidence. He was tidy, organised and worked hard. He is now installing our sons kitchen and floor. Thank you Craig!

Kitchen Fitting

We are very pleased with the work that Craig carried out in our kitchen over the two days he was with us. He created a step for us between the kitchen and the dining room, he cut and shaped the work top to fit the sink, slotted into place the washing machine, dryer and dishwasher and fixed the extractor hood to the wall too! We shall definitely be calling on him again, should the need arise.

Contact Greenhorn Homes