Affordable Housing

Assisting group build projects that are ‘affordable’ is part of our core business aim. PH15 focuses on building fabric that halves space heating demand compared to other NetZero approaches. PH15 reduces the need for on-site renewable technologies and associated costs, ongoing maintenance, and replacement.  Simple heating solutions using direct electricity are feasible. With rising energy prices many are trapped in fuel poverty and living in housing with poor indoor air quality. PH15 provides an affordable housing solution that addresses these problems as well as meeting our climate change commitments.


Hook Hollow CLT

Passivhaus Classic

The first Community Land Trust Affordable Housing Scheme in Wiltshire.

A partnership between Wilshire CLT, Seend CLT, Whitehorse Housing Association, Wiltshire Council and Homes England  to provide 10 locally needed homes.

Passivhaus and Carbon/Energy statistics:

Gross internal floor area (GIA) typical 83sqm

Form Factor 2.4 (terrace of four units)

Annual Heating Demand 15kWh/m2, Heating load 9W/m2

Predicted overheating < 1%,

Initial airtightness: 0.15ach@50Pa (an exceptional result for a small building)

Annual PER Demand 69kWh/sqm

PV generation of Renewable Energy 4.5kWp array per unit.

Design:  PKA Architects

Quantity Surveyors: Nixey Powell Partnership

Contractors: Winsley White Ltd

Completion due: Autumn 2023


PH15 Affordable Social Housing from Passivhaus Homes

Akerman Rd, London SW9

Social housing for Lambeth Council. An urban infill within a Conservation Area.

Mix of lime render, brick entrance porches, brick slips and reconstituted slate roofs.

Cost of PH15 < £450/m². A cost-effective design due to an excellent Form Factor (1.8) of a three-storey terrace layout. A post occupancy study by UCL highlighted health benefit outcomes.     


“You could hear the raspiness in her cough… she doesn’t suffer from that anymore — since we’ve been here, she doesn’t cough in the night.”    Passivhaus Plus Magazine

Passivhaus and Carbon/Energy Statistics:

TFA 371sqm. Form Factor 1.8, with U-values of roof 0.108 W/m2K, walls 0.105 W/m2K floor 0.106 W/m2K.  Heating load 7.9W/m2. Predicted Heating demand 9.1 kWh/m²a. Airtightness test results: 0.34, 0.39 and 0.4 ach @ 50Pa. Overheating frequency 1.9%. 

Construction by Sandwood Construction Ltd.

Completed December 2016.

Certified Passivhaus.

Affordable NetZero Housing for Lambeth Council

PH15 Generic House Types

Passivhaus Classic, Plus or Premium

Generic house designs available, using the PH15 System.

Illustrated is a detached 3-bed house (net floor area 122sqm)

Wide range of external finishes are feasible.

Passivhaus and Carbon/Energy Statistics:

TFA 110sqm. Form Factor 3.2.
Average U-values of walls/roof 0.08W/m2K, floor 0.07W/m2K.
Space heating demand < 15kWh/m2
Air test result typical 0.3 ach @ 50Pa.

Designs by Passivhaus Homes Ltd.


PH15 Houses for 2030


PH15 Tiny House

Generic tiny house designs available.
Wide range of potential external finishes.
Highest quality fabric shell with ultra-low energy demand.
With a roof PV array the tiny house will be a net energy generator.
Affordable housing solution, minimal cost due to modest scale.


Passivhaus and Carbon/Energy Statistics:

Total energy demand 1300-1500kWh per year
Up to 18 PV panels, generating 5kWp array (5000kWh’s per year).
Heated typically by a single 500Watt radiator 500mm x 1200mm size.

RIBA logo
Passivhaus Trust Member
Anti Greenwashing Charter logo
certified passivhaus consultant
Buildoffsite Property Assurance Scheme (BOPAS) was developed to address these concerns and perceived risks associated with innovative construction. BOPAS is recognised by the principal mortgage lenders as providing the necessary assurance underpinned by a warranty provision, that the property will be readily mortgageable for at least 60 years.