Bourne Lane

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Built on an urban infill site in Tonbridge, this high quality, low energy dwelling takes inspiration from the towns brickmaking past, reflecting patterns and details of dark clinker bricks used in some of the town's historic buildings. Sections of Siberian larch add further architectural interest. The design and layout respond to the slightly sloping site, with the house nestled below the main parking area. A large roof window perfectly frames the view of a protected lime tree. An air source heat pump provides heating and hot water and 4kw of solar panels provide electricity. The measured air tightness is 0.34 ACH at 50Pa and fresh filtered air is brought into the building by a Paul Novus 300 MVHR. The structure is a highly insulated (Warmcell) timber frame sitting on an Isoquick 300mm-deep insulated slab. Natural and low/zero VOC materials, such as zero-added formaldehyde Smartply, keep the house healthy as well as comfortable. The zinc roof is 100% recyclable at the end of its life.
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Bourne Lane : Project images

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CO2 emissionsPrimary energy requirement
Energy target

Energy and fuel use

Fuel use by type
Primary energy requirement
CO2 emissions

Measured data from renewable generation is not yet available.

Fuel use

Electricity use - - -
Natural gas use- - -
Oil use- - -
LPG use- - -
Wood use- - -
Other Fuel - - -
Primary energy requirement - - -
Annual CO₂ emissions - - -
Annual space heat demand - - -

Renewable energy

Electricity generationForecastMeasured
Renewables Technology--
Other Renewables Tech--
Electricity consumed by generation --
Primary energy requirement
offset by renewable generation
Annual CO₂ emissions
offset by renewable generation

Calculation and targets

Whole house energy calculation method
Other whole house calculation method-
Energy target PassivHaus
Other energy targets-
Forecast heating load -


Pre-development air permeability test--
Final air permeability test--

Project description

Start date
Occupation date
Location Tonbridge Kent  England
Build typeNew build
Building sectorPrivate Residential
Property typeDetached
Construction type
Other construction type
Party wall construction
Floor area 146.5
Floor area calculation method Treated Floor Area (PHPP)
Building certification  Passivhaus certified building Passivhaus certified building

Project Team

Project lead person
Landlord or Client
ArchitectStudio KAP Architects
Mechanical & electrical consultant
Energy consultantConker Conservation
Structural engineer
Quantity surveyor

Design strategies

Planned occupancy
Space heating strategy
Water heating strategy
Fuel strategy
Renewable energy strategy
Passive Solar strategy
Space cooling strategy
Daylighting strategy
Ventilation strategy
Airtightness strategy
Strategy for minimising thermal bridges
Modelling strategy
Insulation strategy
Other relevant retrofit strategies
Contextual information

Building services

Space heatingEcodan 4kW Air source heat pump with 200l storage tank and underfloor heating
Hot waterEcodan 4kW Air source heat pump with 200l storage tank and underfloor heating
VentilationPaul Novus 300 MVHR
Renewable energy generation system4kW PV
Strategy for minimising thermal bridges

Building construction

Volume -
Thermal fabric area -
Roof description Timber frame with 405mm warmcell insulation and 38mm knauf Omifit Slab
Roof U-value 0.11 W/m² K
Walls description Timber frame with 300mm warmcell insulation and 38-75mm knauf Omifit Slab
Walls U-value 0.13 W/m² K
Party walls description
Party walls U-value -
Floor description Concrete slab with 300mm Isoquick EPS insulation
Floor U-value 0.11 W/m² K
Glazed doors description
Glazed doors U-value - -
Opaque doors description
Opaque doors U-value - -
Windows description
Windows U-value - -
Windows energy transmittance (G-value) -
Windows light transmittance -
Rooflights description
Rooflights light transmittance -
Rooflights U-value -