SuperHome Database

London, Ealing, Chestnut Grove- The first Certified PassivHaus in the area

House Summary

Dora and Zsolt Varszegi

House Type:
1925 Semi-detached

Carbon saving:
80% - Remote Assessed  

  • The Varszegis' home - one of 10 SuperHomes you can visit for the first time in September
  • before refurb
  • during refurb
  • SH 189
  • SuperHome owners

Measures installed:

  • Condensing boiler
  • External Wall Insulation
  • Floor Insulation
  • Low Energy Appliances
  • Low Energy Lighting
  • Mechanical Ventilation Heat Recovery
  • Solar PV Panels
  • Solar Water Heating
  • Triple Glazing
  • Water Saving Devices

Upcoming events

Early interest in Open Days encourages SuperHome owners to host more events. If you'd like to visit this property please contact the owner and let them know. SuperHomers are often happy to respond to questions about their refurbishment project by email between times. Please read ‘more on contacting this SuperHomer’ before you make contact.

What visitors are saying

“Truly fascinating how it is -1 Celsius outside, 22 inside with no heating turned on.”

Personal story:

Dora and Zsolt are a young couple with small kids. Zsolt is a medical doctor and IT engineer, Dora is an IT engineer and got certified as PassivHaus Consultant following the renovation.

They bought a single glazed solid wall property in 2010 and pioneered to convert it to the first PH refurbishment in Ealing. Their limited budget forced them to undertake the  lionshare of the organisation and research work mandated by their project. They were not afraid of getting their hands dirty either. Thus they have plenty of on-site experience which they happily share to help fellow families.


Desire to heavily reduce their footprint and the environmental damage associated with“civilised”, “globalised” lifestyle

Also see:
Property background:

The original property was a 88m2 semi detached council house in the Tree Estates in Ealing. It had single glazing throughout and solid walls. When bought in 2010, the property was in need of refurbishment. Gas consumption used to be 3700 mannually. This covered heating, hot water and cooking of a single household.

The new owners extended the property on the side to 125m2. Later they split the property into two self contained flats and now live in one of them. Currently they are planning to extend their property to the back while keeping their PassivHaus  certificate.

The house has a 12.3kWh/m2 designed annual heating demand, although the apartment didn’t require heating since the renovation. It kept a minimum 19-20 degrees even when the external temperature was -3C for a week. New gas consumption is 500m3/year for the 2 flats, 2 households, covering hot water and cooking.

Key changes made:

  • External Insulation
  • MHRV
  • Airtightness 0.44 air changes/h @50Pa
  • PassivHaus Certified windows, doors
  • Solar Thermal
  • Solar PV
  • Energy Saving Devices (A+++ fridge, LED lighting, etc.)
  • Grey water system – not fully functional yet, pipes installed


Measures installed in detail:

  • External Insulation: 200mm Kingspan K5 Phenolic with acrylic render, 500mm mineral wool loft insulation, PIR and EPS, XPS solid floor insulation
  • MHRV: Paul Novus 300F
  • Airtightness 0.44 air changes/h @50Pa,
  • PassivHaus Certified windows, sliding door, entrance doors: Variotec EF IV, insulated timber frame and Alu cladding
  • Solar Thermal System: Wolf Topson F3-1 Panels,
  • High Efficiency Gas Boiler: Wolf CGB 11 Condensing Gas Boiler, 11kWh modulating down to 3.6kWh, fitted with class A pump
  • Solar PV: 3.75kWp system, 15 panels
  • Energy Saving Devices: A+++ fridge, LEDs, etc
  • Grey water – not fully functional yet, pipes installed
Benefits of work carried out:

  • No heating required in the last 4 years in a row.
  • Even temperature in the year
  • ~50% relative humidity – clothes dry, no mould
Favourite feature:

  • Clothes dry, no mould
  • No heating needed (we wish we didn’t install the radiators)
  • No cold corners, no cold bathroom
Contact this homeowner

Assessment types

SuperHomes Assessed

A home that has been visited and assessed by us and confirmed as reaching the SuperHome standard, which demonstrates a 60% carbon saving.

Homeowner Reported

Information has been provided by the homeowner about their home and energy use prior to the installation of measures and following their installation which demonstrates a carbon saving. This information has not been verified.

Remote Assessed

The homeowner has provided information on their home including what measures have been installed which has enables an assessor working on our behalf to assess their carbon savings. This home has not been visited to verify the measures installed.


This home has not been assessed, but the homeowner has reported what measures have been installed. It may be that this home is awaiting assessment.