Two innovative, near zero carbon houses

  • by Brad Kelly
  • /
  • 2021-04-01 15:33:25
  • /
  • International
  • /
  • 3920 / EN

New Construction

  • Building Type : Isolated or semi-detached house
  • Construction Year : 2021
  • Delivery year : 2021
  • Address 1 - street : 21 Pinnocks Lane SG7 6DF BALDOCK, ENGLAND, United Kingdom
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 155 m2

Certifications :

  • Primary energy need :
    30 kWhpe/m2.year
    (Calculation method : Other )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building

PHPP designed to achieve passivhaus classic certification through applying the Beattie Passive build technology. In addition, carefully selected low energy, recycling and renewables ranging from Envirovent MVHR system, GRAF 2.7m3 rainwater harvesting, Thermoception all-in-one air source water heater for DHW, two Recoup WWHRS are incorporated to achieve a near zero carbon status.  

For added comfort and wellbeing regardless of age, disability, or gender, Smart Home Technology for power and led lighting along with doc M compliant wide door access throughout ground floor, automated pocket door to wet room, push button to control thermostatic showers and bath filling, sensor-controlled basin taps, kitchen gardens for home grown organic produce, permeable driveway, paths and patios, and architecturally designed recessed lighting. 

Internal fixtures and fittings are of high specification.  

External fabric of the buildings such as Internorm triple glazed aluminum clad UPVC doors and windows, automatic solar controlled tripe glazed velux windows, cedral woodgrain effect cladding, colour through thin-coat K-Rend, fibre cement slate effect roof tiles, dry roof ridge and verges, anthracite wood grain effect upvc fascia and soffit have all been chosen for their quality appearance, long life, high performance and low maintenance. 

Photo credit

Brad Kelly


    Probuild Limited



    Probuild Ltd


    Probuild Homes Ltd


    Beatie Passive Ltd


    Thermoception Ltd

Owner approach of sustainability

Mr Brad Kelly (Director of Probuild and Probuild Homes)  is an Energy Consultant, assessor, engineer, designer and developer, and construction contractor. I believe that current building regulation and planning policies are outdated and the current levels of what is claimed to be sustainabible construction is subjective. Probuild wish to champion builds for the future which provide mutual benefit to the environment, developer, contractor, and end user/owner. Sustainability is continued externally with the inclusion of kitchen gardens for organic produce, and permeable hard surfaces.

Architectural description

The build skeleton created is Beattie Passive build technology. This is a 300mm wide timber framed structure, fully filled superbead injected insulation with Magply sheathing sandwiching the timber frames and insulation wrapped in frametite and intello air tight membrane. The external finish of the dwellings are a combination of white K-Rend render, and white Cedral weatherboard wood grain effect cladding. The roof finish is black/blue fibre cement slate, with anthracite woodgrain fascia and soffit which compliment the aluminium clad UPVC internorm triple glazed windows. The external building fabric is  lit through led strip lighting in soffit, plus up-lighting in the resin bound  permeable driveway and paths. The front and back gardens have greenery from grass, and shrubs throughout. Internally, the properties are designed open plan and spacious, with smart technology controlling lighting and power

Energy consumption

  • 30,00 kWhpe/m2.year
  • Other

    Primary energy needs corresponds to Passivhaus PER value.Heat demand 13.9 KWh/(m2a)Heat load 10 W/m2Air tightness 0.3 Non Renewable primary energy PE demand 30kWh/m2aPER demand 14 kWh/m2aPrimary energy renewable Generation of renewable energy 4 kWh/(m2a)

Envelope performance

  • 0,30


    • Heat pump
    • Heat pump
    • Double flow heat exchanger

    Two Recoup WWHRS installed to pre heat the supply water to the air source water heater and the shower.

Smart Building

    smart control (voice, phone and manual) Lighting and power controls throughout. Alexa provides as well as ring doorbells, smart phone app linked car charger, showers and bath fillers via smart/remote and button control. electric income is smart meter.

    We have applied smart features which we believe are practical and simple use for end the user

Construction and exploitation costs

  • 405 000

Urban environment

Set in the historic market town of Baldock located in the district of North Hertfordshire which was founded by the Knights Templar in the 1140s. Baldock boasts an array of period buildings and a popular high street presents along with new modern builds and fantastic access to the A1M North and South bound. The external design therefore took into account the various ages and styles of properties in the area to fit in. The town boasts an excellent array of independent shops, Good Ofsted schools, pubs and restaurants, with the adjoining towns of the first ever Garden City in Letchworth Garden City and Hitchin providing an even wider range of facilities. Baldock is only 33 miles away for London or better still only a 30 minute train ride from Baldock to London’s King’s Cross which makes Baldock a commuters dream of a semi rural setting with great links via transport.

Probuild Ltd has applied what we believe to be one of the best passivhaus build methods (Beattie Passive) to achieve the fabric first principles. We have then expanded on this to achieve near zero carbon status by incorporating best choice low carbon, low maintenance energy efficient recycling and renewable systems. Use of smart home technology in the home, plus consideration for the external of the home such as building kitchen gardens to encourage home grown produce using irrigation from rainwater harvesting and fertiliser from compost plus permeable surfaces throughout all whilst remaining in keeping within the existing street scene has been challenging but successful.

Contest categories

Energy & Temperate Climates

Energy & Temperate Climates

Low Carbon

Low Carbon

Health & Comfort

Health & Comfort

Green Solutions Awards 2020-2021

Author of the page

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