Zero-carbon Homes

Zero-carbon Homes

The efficiency of your home is determined primarily by the construction fabric of the external envelope.  Our kits provide high insulation and glazing levels to reduce the heating load on the dwelling, working towards the Government target of providing Zero-Carbon Homes. The main design principles we follow for the fabric are:

  •  Maximizing air-tightness
  •  Using high performance insulation materials
  •  Reducing thermal bridges
  •  Using thermal mass of the building fabric

We work closely with a services engineer and renewables partner – Lo3 Energy - who is fully accredited to advise, design, supply and maintain a wide range of Technologies including:

  • Air Source Heat Pumps
  • Ground Source Heat Pumps
  • Wood Stoves, Back Boilers & Thermal Stores
  • Biomass Boilers
  • Biomass CHP
  • Solar Thermal
  • Underfloor Heating
  • District Heating

We would recommend you choose a very efficient system as conventional alternatives will mean you have to spend more money elsewhere in the building to compensate for the higher emissions.  An options appraisal which looks at capital costs and running costs, as well as comparative efficiency, allows an informed decision on which system is best to invest in.

The most common technology for a renewable system at the moment is the air source heat pump (ASHP) which is very competitive in price and also has government financial support with RHI.  The Energy Saving trust they will have the latest information on financial support available.  You can contact them here:

For a Building Warrant in Scotland under the regulations we require to provide a SAP calculation to verify the carbon emissions of the building in use.  This is a standard document which encompasses all the fabric performance, heating, ventilation, cooking & lighting energy use of your home. When we have prepared a detailed design and a SAP calculation our services engineer consultant will liaise with you to discuss the potential options available in passing the carbon targets.  We can offer upgrades to increase the performance of the fabric & also active systems as outlined below.

Option 1: Pass the building regulations. Standard SIP/Timber Kit to meet the building regulations. This is already energy efficient and typically gives an EPC rating of C.  We would recommend this approach with constrained budgets

Option 2: Exceed the building regs. High performance kit, better U-values & systems for a low energy home. Upgrade the windows to triple glazing add renewables systems to achieve an EPC rating of B or above.

Option 3: Max performance on the active systems to have a “net zero home” which costs nothing to run as you generate electricity and have super efficient heating & ventilation to achieve an EPC rating of A.

Option 4: Further increase performance to Passive House Standards.  This is the highest preforming specification which allows heating systems to be removed completely.  This certification was developed in Germany and we have accredited suppliers and consultants that can deliver this gold standard of energy efficiency. You can find out more here:

Once complete, you will have a SAP Rating from 0-100, with 100 being the most efficient home and is based on the energy related running costs of the dwelling.They demonstrate compliance with building regulations Part L in England & section 6 energy in Scotland. After the building is complete the software can be used to produce an Energy Performance Certificate (EPC).

Early discussions with our team will allow us to design to the standard that best suits your budget and your aspirations.