Code 5 – Timber Frame Build- Thurlestone, Devon Residential & Social Housing

Timber Frame Build

The houses were designed using a modular system to enable flexibility, to suit individual tenants and the constraints of the site. There are 2 L-shaped units and 2 terraces which cascade down the sloping site. This way of designing allows a rapid and efficient building and design process. The project achieved Code 5 of the Code for Sustainable Homes in the Design stage.

The build process comprises a passive slab and timber frame system built offsite, which act as an airtight layer to Code 5 specification in the Code for Sustainable Homes (Design stage) and include Passivhaus features to maximise energy efficiency.

These buildings feature mechanical ventilation with heat recovery (MVHR), providing fresh air to every room in the house, while keeping the building warm and keeping heating costs down. Each house features solar photovoltaics (PV), integrated with the aesthetic of the roof’s construction and solar thermal providing 60-70{61202672cc7a6db90e23af640e533e6b03ac74d6f30b3c3caffdd8cfa814fe3f} of annual hot water needs. There is also a rainwater harvesting system to recycle water from the roofs for use in toilets and washing machines.


ProductPerformance/U-valuePotential benefits
MBC timber frame twin wall 300mm0.12 W/m2kIncreased heat retention
MBC timber frame roof 400mm0.11 W/m2kIncreased heat retention
Munster Joinery Eco Clad Pasivhaus windows0.86 W/m2kReduced heat loss
MBC Passive slab0.9 W/m2kIncreased heat retention and thermal mass
MVHR Nuaire™ MRXBOX95-WH195{61202672cc7a6db90e23af640e533e6b03ac74d6f30b3c3caffdd8cfa814fe3f} heat recovery, Fan power 0.4W/l/sImprove air quality and heat retention
Kloben Solar thermal16 TubesReduced CO2 and 60-70{61202672cc7a6db90e23af640e533e6b03ac74d6f30b3c3caffdd8cfa814fe3f} hot water
Phono Solar Onyx PV panels15 panels -3.975 kW – 3204 kWh approx.Reduced CO2 and free electricity
7500L Stormsaver™ Rainwater HarvestingWater usage ≤80L/day/personWater saving from toilet flushing and washing machine
Dwelling Emission RateDER ≤ 5.57<ZERO CO2 from heating, lighting, hot water and fans
Code For Sustainable Homes88 points from 107 – Level 5Demonstrating exemplar sustainability across the 9 categories