Ostro Passivhaus

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This new build passivhaus home is to be located within the historical conservation village of Kippen, near Stirling. The site is a large south facing plot, featuring a small burn, and facing woodland and fields to the west and south. The house enjoys a semi-rural setting and is clad in naturally weathered timber to reflect the woodland that it faces. The design for the house is based on the concept of a 'box within a box'. The inner box is conceived as a homogenous sculptural form that is present in every space; it contains all of the wet services and circulation and serves the other spaces. The outer box is a rainscreen of naturally weathered timber cladding with vertically orientated, punched out triple glazed openings, orientated on a north-south axis. The rooms exist as spaces between the inner and outer boxes.
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Ostro Passivhaus : 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 PHPP
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 Kippen, Stirlingshire   Scotland
Build typeNew build
Building sectorPrivate Residential
Property typeDetached
Construction type
Other construction type
Party wall construction
Floor area 170
Floor area calculation method Treated Floor Area (PHPP)
Building certification  Passivhaus certified building Passivhaus certified building

Project Team

Project lead person
Landlord or ClientPrivate Client
ArchitectPaper Igloo
Mechanical & electrical consultant
Energy consultant
Structural engineer
Quantity surveyor
ContractorHeat Recovery Scotland

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 heating
Hot water
Renewable energy generation system
Strategy for minimising thermal bridges

Building construction

Volume -
Thermal fabric area -
Roof description
Roof U-value -
Walls description
Walls U-value -
Party walls description
Party walls U-value -
Floor description
Floor U-value -
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 -