Andrew Lees Architect

Andrew Lees Architect

Bio

My practice has a focus on sustainable design: holistically both in terms of low impact material specification as well as low in-use energy design. Retrofit of the existing building stock is also a key practice interest coupled with an appreciation of and experience of working with historic buildings. The Retrofit of buildings of historic interest is clearly an emergent field – I think that there are rewarding synergies to be enjoyed between rediscovering building with natural materials in pursuit of the healthy buildings today and with the buildings of the past. In 2015 I completed an MSc Architecture: Advanced Environmental and Energy Studies Graduate School of the Environment at the Centre for Alternative Technology. This was a conscious realignment of my career to one more sustainable and I stepped out of mainstream practice soon after to pursue my goal of establishing one built around my ethos. My aim is to combine sustainable architecture with creative design. Evidence based rigour coupled with buildings that delight. All projects have sustainability embedded but as well as traditional architectural design I also offer Building Energy and / or Retrofit Analysis as a stand-alone service utilising Passivhaus software for the energy simulation component.

Address

48 Norwich South Street, Park Hill

Sheffield

South Yorkshire

GB

S2 5AY

Level

Sole trader

Start Date

January 28, 2026

Category

Design and Consultancy

Specialisms

Architecture/Design, Building Modelling, Conservation/Heritage, Domestic Retrofit/New Build, Energy Efficiency/Energy Performance, Fabric First Approach, Health/Comfort/Wellbeing, Natural Building Materials, Non-Domestic Retrofit/New Build, Passivhaus, Retrofit

Approved AECB Service Provider

Whole house Retrofit

This project is a whole house Retrofit of a semi-detached house. The foundation of the project was an in-depth energy report collating existing energy use data from bills which was then used to define baseline energy use and carbon emissions for the house and in turn validate a corresponding “as existing” thermal model. Iterative modelling then defined an optimal approach to building fabric improvement to improve energy efficiency by 65% with a predicted consequential leap in thermal comfort. This then informed the subsequent design and specification: significantly improved insulation and airtightness and the installation of an MVHR system to provide energy conserving cold season ventilation. The Retrofit utilises low embodied energy materials for example woodfibre and lime render external wall insulation and timber framed construction to the new build elements. Phase 1 of the project is now complete and its performance is being analysed against design predictions.

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