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

07502 425158

Bristol, UK



Passivhaus - Is it worth it?

Piers's presentation to a sold out Green Register Bite Size event on 24th November at which he helped Greenheat Sustainable Construction to answer the question - Passivhaus - Is it worth it?  The event was well attended by a range of building professionals who were able to hear from Rich Hatfield of Greenheart how they are using lessons learned from building to the Passivhaus standard in a range of low energy buildings.  Piers's presentation covered costs and benefits and showed how over a 20-30 year period, properly designed Passivhaus buildings will almost always be better value than typical buildings built to current Building Regulations.  He also explained how best to achieve the Passivhaus standard through careful planning, design and construction.



Another Listed Building needing an Energy Upgrade

This Grade II Listed former textiles mill is undergoing a change of use to residential use with groundfloor office space.  We are working with Greenheart Sustainable Construction to develop the detailed plans for the conversion, making the building energy efficient and comfortable to live in, whilst being sensitive to the buildings heritage.  

Insulating old solid walled buildings needs to be done with care and a whole house approach will be taken to include insulation, wiondow upgrades, airithghtness, ventilation, heating and hot water.  

The fundamental strategy is to select appropriate, mainly natural, building materials and get the ventilation and vapour control right.



Grade II* Listed Building Refurbishment

We have recently been appointed to advise on servcies and roof insulation for this Grade II* Listed house.

The heritage value of the building dictates most of the works with restoration as the main driver.  The focus for energy efficiency is on insulating the roof and providing energy efficient heating and hot water.

We are advising on design and procurement of a 50kW water source heat pump with oil backup for heating and hot water.  



The geometry of the roof, combined with the historic structure makes insulating the roof effectively without risking damage highly challenging.  





Three rules to make Passivhaus much easier

My July blog for the Green Register explains how to make it much easier (and cheaper) to build a Passivhaus.  These rules aim to guide designers and clients on key features from the outset.  If you don't take note of these riules you probably won't end up with a Passivhaus and your house will be much less energy efficient than you probably hoped.



New 26 Unit Passivhaus Development in Bristol

Piers has been appointed as Passivhaus Consultant on a scheme to build 26 Passivhaus dwellings on the site of the former bingo hall in North Street, Bristol.  The project team for the development, known as Picture House Court is as follows:

Developer - North Street Investments

Architect - Origin 3 Studio

Passivhaus Consultant - Piers Sadler Consulting

Passivhaus Certifier - BRE Certification

Structural Engineer - Hydrock

M&E Engineer - Hydrock

Project Manager - Aecom

Main Contractor - Speller Metcalfe


Construction work started on site in 2013, but was stopped whilst a new team was appointed for the project. Work is about to start on site agin, and whilst Passivhaus work was done before the original start on site with Origin 3 working with BRE, there is still a lot to be done to confirm the suitability of the designs and performance through PHPP.  

These are relatively complex buildings, so there is a lot of work going into thermal bridge free and airtight design.  Airtightness is clearly going to be the key challenge.  To get up to speed with the project quickly and aid the smooth running of the Passivhaus consultancy Piers was co-located with Origin 3 Studio for about 6 weeks at the start of the work.