Future-Proof Your Buildings with Expert Retrofit Design

‘A successful retrofit design is vital for enhancing building performance, energy efficiency, and overall sustainability.’

Sustainable, Cost-Effective, and Smart

Is your property underperforming? Rising energy costs, outdated layouts, and inefficient materials can make even the best spaces feel like a liability. Our expert retrofit design service transforms existing buildings into high-performance, low-energy, and future-ready spaces – without the need for costly demolition.

Why Retrofit?

Lower Energy Bills – Reduce consumption and improve thermal comfort
Sustainable & Net Zero Ready – Meet carbon reduction tests with ease
Enhanced Property Value – A modern, efficient building is a smarter investment
Minimum Disruption – Improve without starting from scratch

By adhering to the PAS2035 framework, each project can maximize comfort, reduce carbon footprints, and extend the lifespan of existing structures. Thoughtful integration of retrofit measures into buildings not only transforms spaces but preserves their unique character.

Why Work With Us?

At Mitchell Architects, we embrace a holistic approach, prioritising robust design and quality materials tailored to each project’s specific needs.

We are Architects who understand Retrofits – We specialise in adapting and upgrading existing buildings with precision and creativity
Customised Solutions – Every retrofit is tailored to your building’s unique needs
End-to-End Service – From feasibility studies to design and project management

‘Our commitment goes beyond aesthetics; we aim to create functional, efficient environments that improve occupants’ quality of life and contribute positively to the community. By investing in effective retrofit strategies, we pave the way for a more sustainable future, ensuring that our built environment serves both present and future generations.’

Partnerships

Advantage South West

We are proud to be an approved Consultant within the Advantage South West Framework to deliver Energy Efficient and Decarbonisation Retrofit Works thoughout the South West. Advantage SW was formed in 2004. In 2007 a procurement consortium was formed, which arranges ‘frameworks’ that registered social housing providers can access. Members own around 150,000 properties located mainly in the South West region.

Efficiency North

For design and consultancy service specialising in green retrofit and decarbonisation strategies and expertise. A member led and owned consortium of social housing landlords, who share our membership’s commitment to efficient procurement, adding social value, environmental sustainability and economic regeneration in Northern England. One of the original trail-blazing social housing procurement consortia established in 2006.

Retrofit Project Examples

Hill Park Road and Lee Court – Brixham

A deep PAS 2035 compliant retrofit project in Brixham, consisting of 32 houses and bungalows, as well as 3 blocks of 8 flats each. The ground floor consists of an internal timber frame skin and an outer no-fines skin, while the first floor is just timber frame. This deep retrofit included the following measures: external wall insulation, replacement of windows and doors, re-roofing works with associated structural repairs, pitched and flat roof insulation, as well as ventilation upgrades.

Our involvement in the project was from RIBA Stage 3 – RIBA Stage 5. Full plans applications, as well as certificate of lawful development planning applications, were submitted. Robust designs were provided in line with all relevant standards, and reliable on-site support was provided during the construction phase.

Hoyles Road, Paignton

Twelve houses and 26 2-storey flats of cavity masonry underwent deep retrofit consisting of External Wall Insulation, cavity wall extraction and replacement, replacement of windows and doors, re-roofing works, pitched and flat roof insulation, as well as ventilation upgrades. All design and construction work were carried out in line with PAS2035 and PAS2030.

We were involved from RIBA Stage 3 up to and including RIBA Stage 5. We submitted full plans applications, as well as certificate of lawful development planning applications. Robust designs were provided in line with all relevant standards, and reliable on-site support was provided during the construction phase. Additional support was provided with party wall concerns, as well as advising on additional remedial works.