Sustainable Building and Carpentry Services in and around Bristol


What We Do

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 and decorators to produce a high quality, high spec extension to your home.

Garden Rooms

Build your dream home office/play room/studio in your garden. We will work with you to design and build an insulated, serviced independent room in your garden. Usually they do not require planning permission but we can advise on this and help with the process if needed.


Recent Projects

Clare’s Extension – Kingswood
Jim’s Extension – Lockleaze
Chaz and Nicole’s Loft – Horfield
Chaz and Nicole’s Extension – Horfield
Ben & Carole’s Extension – Knowle
Alison & Millie’s Extension – Horfield


Welcome to Greenhorn Homes Ltd- my name is Craig. I am a qualified Carpenter, Passive Haus accredited and member of the Federation of Master Builders with over 15 years’ experience. My customers describe me as trustworthy and skilled. I take great pride in the quality of my work and specialise in extensions, loft conversions and ‘futureproof‘ renovations.

Greenhorn Homes started in 2014 and is the culmination of over 15 years’ experience in the building and carpentry trade. My passion for the trade and keen interest in sustainable, low impact building methods has taken me to Scotland, France, Australia, New Zealand and the Pacific Islands before finally choosing to settle and start Greenhorn Homes in Bristol (‘the UK green building capital’).

The business has continued to grow and mature with each year, we have established relationships with local architects, tradespersons and suppliers as well as a host of happy customers! I am really enjoying working hard to grow my business and a loyal customer base.

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.

Passive House Explained in 90 Seconds from Hans-Jörn Eich on Vimeo.

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.


PassiveHaus buildings provide a constant supply of fresh air, whilst maintaining a comfortable indoor air temperature.

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!

Garage conversion

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.”


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.”


Craig and his team did a brilliant job. We had our old kitchen ripped out and demolished and a new, full width, kitchen/living space extension build from foundations to internal plastered finish (with all the electrics). We didn’t have the garage done in the end due to a boundary retaining wall issue.
The finish on all of Craig’s work was great and was completed (basically) within the time frame stated. But more importantly than that, Craig was great to work with. He is easy to talk too, willing to discuss issues, took my opinion seriously and always gave us a briefing of what they were planning. This to me rates really highly when it comes to choosing a tradesman. There was a point within the build when my partner and I changed our minds as to one aspect of the finish. This was taken seriously and although this generated more work, the team were happy do as we asked.
On top of this Craig was happy to lease with building control throughout the project, coordinate other tradesman and give constructive design input during the process. I would have no hesitation in recommending him to others and he will be the first person I ring when I get round to (and save up for) building our garage.”

Contact Greenhorn Homes