This 150m2 single storey 3 -bedroom Gamekeepers Lodge is sited on a landed estate near Tewkesbury in Gloucestershire. Building started in late April 2012 and the lodge was completed in September 2012 (on schedule).
The project involved the demolition of a steel portal building previously used to rear pheasants and had to be conducted with minimal disturbance to the pheasant chicks in nearby buildings.
The owners of this property are tremendously keen on sustainability and energy efficiency and were looking to deliver both in the new lodge they wanted for their head gamekeeper.
As the “As Built” Part L SAP* test and accompanying analysis document for this house confirmed, both Sustainability and Energy Efficiency have been fully delivered in the completed building;
The lodge is insulated throughout with compressed wood fibre insulation made by Steico in Germany and internally it is clad in Fermacell. Fermacell is an exceptionally durable and sustainable cladding board, again made in Germany, from recycled gypsum and woof fibre.
Design Air Permeability
When air is lost from a building the heat is taken with it; to assess this the building underwent an Air Pressure test and low readings show not only build quality (ie all the joints fit!!) but also that buildings provide optimum thermal efficiency and minimise running costs.
The air pressure test result was 2.11m3/m2/h against the standard Building Regs limit of 10m3/m2/hr. @ 50 pa. For comparison most new builds in the UK achieve air permeability readings between 5 & 8m3/m/2h @ 50pa.
(insulative properties of the superstructure)
- The windows are between 0.8-1.3 W/m2K (current UK average is in the range 1.6 – 1.8W/m2K),
- The walls deliver 0.18w/m2K (current UK Building Regs require 0.35w/m2K)
- The roof achieves 0.15W/m2K (current UK Building Regs require 0.25 w/m2K)
These figures clearly illustrate how much better insulated the building is compared to current UK building regulations.
The EPC forecast that the total energy costs to run this building are estimated to be £895 per annum. Not bad for a house with a 150 sq. m footprint.
*SAP calculations measure heat loss through the building, available sunlight and air permeability. These are then combined with the energy needed for heating, hot water, lighting and ventilation to measure a dwelling’s overall energy efficiency. The SAP is also used to create the Energy Performance Certificate (EPC).