Guildford, for homes across Surrey and the South East

Passive House & Retrofit Consultants

Experts in retrofit and new build low energy housing using Passive House methodology and natural low embodied carbon materials.

5.0 from 16 Google reviews
A C17 Grade II listed half-timbered house in Surrey

Your existing home

Retrofit assessments, historic and listed homes

Retrofit your existing home
Alex Clifford’s own timber clad Passive House on the edge of Guildford

A new low energy home

Passive House design, PHPP modelling, project management

Passive House

Retrofit assessments

See what is really going on in your house

Thermal imaging shows missing insulation, thermal bridges, draughts and leaks without pulling the house apart. These are from our own surveys.

We are totally independent. Many Retrofit Assessors and Retrofit Coordinators are employed by insulation companies and as such may not give impartial advice on the best treatment for your home.
  • Thermal image: Failed cavity insulation
    Failed cavity insulation
  • Thermal image: Thermal bridge around door
    Thermal bridge around door
  • Thermal image: Heat loss through unused chimney
    Heat loss through unused chimney
  • Thermal image: Leaking loft hatch
    Leaking loft hatch
  • Thermal image: Dot and dab plasterboard
    Dot and dab plasterboard
  • Thermal image: Air leak under door
    Air leak under door

How a retrofit assessment works

It is perfectly acceptable to spread a retrofit over time, but it is essential to understand the impact of each change. We create a step by step plan that minimises risk to the building and maximises the savings.

  1. 1A floor plan and pen on a desk

    Your first conversation

    We meet and talk about what you want for your home, any problems you already have and what you spend on energy. Planning works or an extension? That is the perfect time to start, and we can review your design proposals.

  2. 2Looking into a floor void during an assessment

    The assessment

    We assess the house top to bottom: how it is built, its condition and what suits it, with thermal imaging, a blower door test where useful, checks of walls and floors, and extract fan flow rates.

  3. 3A page of a Clifford Design condition survey

    Your report and plan

    Urgent maintenance first, easy wins for short term savings, then every retrofit measure in the right order, with the risk of each assessed using the PAS 2035 methodology.

  4. 4Wood fibre roof insulation being fitted on site

    Further stages

    We work with you, your architect and your builder so the details are designed and built right: PHPP modelling, on site training and quality control.

What clients say about their homes

5.0from 16 Google reviews
Victorian / Edwardian house · detailed survey

We have a part Victorian / part Edwardian house with single glazing and limited insulation, which we are hoping to retrofit with a heat pump and additional insulation. However we were concerned that given the age of the house this needed to be done sensitively and with the right materials to avoid causing damp issues. We found Alex through a recommendation.

Rachael LaanGoogle review · 5 stars
1970s house · retrofit assessment

Our 1970’s built house was freezing in winter, a supposed EPC rating of ‘C’ just not adding up with what we were experiencing. We were already planning an extension and some other improvements.

H&JGoogle review · 5 stars
Cold and condensation · retrofit assessment

We asked Alex to carry out a retrofit assessment after receiving conflicting advice from various tradesmen about how to address the cold and condensation issues in our property. He was extremely knowledgeable and flexible around our needs, taking the time to understand our situation fully. His guidance was incredibly helpful and has likely saved us several thousands of pounds in unnecessary work.

JamesGoogle review · 5 stars
Tudor cottage · insulation and damp

Alex spent a morning advising me on the insulation and damp issues in our Tudor cottage. He then sent a report and a set of thermal images for my reference. He's very knowledgeable, thorough and patient explaining the science behind his advice. I feel his advice is 100% trustworthy and his pricing reasonable. I'd definitely recommend him.

Caroline LGoogle review · 5 stars
Barn conversion · PHPP modelling

We initially chatted with Alex during the design part of our barn conversion. Through his experience and PHPP modelling we were able to make some very effective changes to our design and materials. This was particularly helpful by prioritising where to focus our budget and time for best improvements on efficiency.

Restoration CoupleGoogle review · 5 stars
Converted barn · Hampshire

We have a 35 year old converted barn in Hampshire. We have owned it since new and we love it. Our concerns are (a) the insulation is less good than it should be and as a consequence parts of the house are often too hot in the summer months and (b) it has oil fired heating which in due course will have to be changed to an air sourced heat pump, or equivalent.

GrahamGoogle review · 5 stars
1950s house · renovation and extension

Alex has been extremely helpful with the renovation and extension of our 1950s property. He undertook an initial retrofit survey (including thermal imaging and airtightness test) and provided initial advice. This was followed by PHPP modelling and recommendations on specific retrofit standards and targets.

Bill NelsonGoogle review · 5 stars
1920s house · renovation and extension

Alex has been fantastic in helping us plan the renovation and extension of our 1920’s property. We were lost in the quagmire of options around insulation, heating and energy efficiency - and how to achieve a pragmatic balance without upsetting the fabric of the house. His experience and guidance has been invaluable in designing an efficient, but cost effective, solution.

Charlie HeathcoteGoogle review · 5 stars
Renovation · deep retrofit

Alex gave the best of advice to us from the very beginning to end of our renovation project. His love of heat guns and PHPP models, knowledge of materials, help with builder and advice on possible curveballs/watchouts for our renovation exceeded that of all other suppliers we had working on the job.

will cohenGoogle review · 5 stars
Bungalow with loft room · thermal imaging

Very good experience. Alex came to do the survey and thermal imaging. Lots of discussion whilst he was here. The report was good, and pointed out at least two areas which need attention and which I had not considered at all. Thermal imaging particularly useful. Very useful zoom meeting followed. The process has allowed me to set priorities for the works to improve the thermal efficiency of my bungalow (with loft room added).

Paul TimothyGoogle review · 5 stars
Heat loss and moisture · survey

With climate change and energy costs of increasing concern, it felt a little overwhelming to know where to start to improve matters. I’m so pleased that I called Alex. He was punctual,, thorough and extremely knowledgeable. He showed me where my house was losing heat and retaining moisture (which could lead to damp problems in the future).

Sarah GibsonGoogle review · 5 stars
Damp issues · survey

Alex surveyed our house given we had a number of different damp issues. He came across as very knowledgable, practical and easy to talk to. Alex sent us the thermal images and provided some immediate actions we could do as well detailing other solutions to help sort out the damp. I would certainly recommend Alex.

Rich MGoogle review · 5 stars
Old bungalow · energy advice

Alex was approached for some broad energy advice for the renovation and extension of an old bungalow. He provided very useful, honest and insightful advice. We may ask him for further input into calculations and design, but so far this has been very valuable.

Marc&Agi VerletGoogle review · 5 stars
Extension and rebuild · thermal imaging

Excellent thermal imaging survey and assessment of the requirements for improving the effectiveness of the house extension and rebuild to achieve a comfortably warm house with ground source heat pump fed from twin boreholes, triple glazing, underfloor heating and MVHR system. To be highly recommended.

Nod Clarke-HackstonGoogle review · 5 stars
Barn conversion · insulation

We have been really pleased with Alex's prompt and professional advice regarding refurbishment works to improve thermal insulation in our barn conversion. Would highly recommend.

Luciana TeshimaGoogle review · 5 stars
Professional service

Excellent professional service and clear communications. Highly recommended.

Peter HampelGoogle review · 5 stars

We look forward to hearing about your build.

The timber clad Passive House from the garden, with a balcony and terrace
View from the balcony across the fieldsThe house from the driveFront door set in timber cladding

Our own Passive House

Winner, Guildford Society Design Awards 2020

Alex designed and self built a super insulated, low energy five bedroom family home on the edge of Guildford, designed to Passive House standards. It replaced an original 1950s bungalow and won the Individual House category, recognised by local architects and the council.

“A beautifully crafted timber clad house replacing an original 1950’s bungalow. The house is refreshingly understated and set on the edge of the town overlooking the surrounding countryside.”

The judges, Guildford Society Design Awards 2020

The award film: 2020 Guildford Society Design Awards, Individual House

See the house and our other projects

Alex Clifford

Alex Clifford

“I have an extensive Design and Project Management background with over 25 years in the Retail, Leisure, Office Design and Residential Design and Construction sectors, and have completed my own award winning design and build of a low energy Passive House.”

  • Certified Passive House Designer
  • PAS 2035 Retrofit Co-ordinator, level 5 diploma
  • Retrofit Assessor, level 4 diploma
  • AECB Approved Certification group
  • AECB CarbonLite Retrofit training
  • Energy Efficiency for Older and Traditional Buildings, level 3
  • Domestic Energy Assessment, level 3
  • BA Hons 3D Design, Product
  • Certified Passive House Designer
  • Passivhaus Trust member
  • AECB, building knowledge
  • Green Register member
  • SPAB supporter

More about Alex, press and talks

Considering a low energy build or a deep retrofit?

Get in touch for help from a certified Passive House designer with design advice, a retrofit assessment, project management or client liaison.

  • Mobile07931 717 379
  • Emailalex@alexclifford.co.uk
  • Hours
    Monday to Friday9am to 5:30pm
    Saturday and SundayClosed
  • Based inGuildford, working across Surrey, the Home Counties and the South East

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