Harpenden Passivhaus
Project Description
We are building a replacement dwelling on the site of an old bungalow. The new-build will be an all-electric timber frame 4 bedroom Passivhaus Plus using the βhomes as power stationsβ concept. This means it generates much more electricity than it uses and it can operate βoff-gridβ without need for grid electricity supply for much of the year, saving any excess in its battery system and further excess sold back to the grid. It affords the occupiers a warm and comfortable environment with constant fresh air. The designers bere:architects also designed our RIBA award-winning project Max Fordham House.
This property is also one of the first installs in the UK of a Pichler PKOM4 fully integrated 2 stage air source heat pump hot water cylinder with MVHR, heating and cooling through air, (air to air), heating through water (underfloor) and hot water as one item. It has been integrated into the Loxone smart home system. The property takes its water from a well and has a huge rainwater harvesting tank which supplies toilets and the washing machine. A 3 stage waste water recycling centre was installed to treat sewage. The resultant βgrey-waterβ is used to irrigate the garden and surrounding fields.
Light and heating sensors in the house communicate with the smart home system which automatically operates the external shutters on windows to regulate internal temperatures. Installing a sprinkler system in a timber frame house also brought complications and required integrated auto water shutoff with four water sensors around the house. If any of the bathrooms or utility room leak water, it auto shuts of water for whole house to prevent damage to the timber frame or insulation.
“Weβre really lucky to have Bow Tie Construction working on our project. Thanks for all your fantastic work so far.”
“Rafael demonstrated a great knowledge in respect of building work and was able to draw plans and give advice regarding interior design.”
“All the onsite employees were polite and meticulously tidy, doing their very best to fit in around us.”
“I have enormous respect for Bow Tie as a contractor: Itβs a real pleasure not having constant battles and headaches from a builder trying to do the bare minimum.”
βIt quickly became clear that Bow Tie want to do a good job, they want their work to be to a high standard, no problem is too small to discuss and identify solutions, they really want to get it right.β
Interested in working with us?
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