Passivhaus Consultant and Designer, Bristol.  Very Low Energy Buildings.  Domestic and non-domestic.  New build and refurbishment. 

07502 425158

Bristol, UK



House refurbishment SW London

I have been appointed by White Design to provide energy advice for the refurbishment of a 5 bedroomed 1970s house in SW London. The refurbishment involves a large two story extension, insulation of external walls and roof and upgrading of doors and windows.  The aim is to create a building which exceeds the requirements of the 2010 Building Regulations.  The commission includes specification of 3 kW PV, 6m2 evacuated tube solar thermal system, gas condensing boiler and controls and twin coil hot water cylinder, together with U value calculation and SAP 2009 modelling.


Passivhaus design

I have been appointed by a private client to provide support on Passivhaus design for a new house in Hertfordshire.  I am working with architects Eades Hotwani Partnership to develop a house of outstanding architectural and environmental merit.  I have been through the experience of starting with a design and trying to make it meet Passivhaus requirements through PHPP modelling.  This is clearly not the best approach and we have finally almost gone back to the drawing board.  The project continues


Contaminated land risk assessment review

I have been appointed to provide high level review and technical advice to an international engineering and environmental consultancy on a complex contaminated land risk assessment.  The site is a former colliery spoil heap with a number of tar lagoons on it.   I have reviewed the available information and risk assessments and assisted in developing a case to present to the EA to support proposed remediation targets.  I provided support to the conceptual model and quantitative risk assessment by drawing additional interpretation from the contaminant distributions and site hydrogeology and hydrochemistry.  EA negotiations continue.


GreenFit eco:refurbishment service launched

GreenFit is a collaboration between Hugh Nettelfield Consultancy, BEAM and Piers Sadler Consulting and provides a complete service in design and construction of energy efficient building refurbishment works.  The service is offered through the Natural Building Store as well as direct.

We have hit the ground running, undertaking three surveys in our first month and with more ordered.

Our service includes:

  • building energy surveys;
  • insulation advice;
  • energy systems and renewable energy;
  • construction.

Preliminary energy surveys identify where the major heat losses from the building occur and identify the most effective ways of reducing building energy usage.  Costs of preliminary surveys are: 

Building size


(∼1- 2 beds)


(∼3-4 beds)


 (>∼4 beds)





*VAT is not chargeable on these surveys


New building refurbishment appointment

Piers Sadler Consulting has been appointed as a sub-consultant to White Design architects to work on the refurbishment of two 6 bedroomed Victorian houses in Clifton, Bristol.  The development is being undertaken by green developers Footprint Building.  The role includes specification of solar thermal and PV systems, gas central heating and control systems together with undertaking SAP calculations for part L compliance.  

The houses will be insulated with internal wood-fibre insulation throughout, taking the U-values down to 0.2W/m2.