What Architects Should Know About MVHR for Listed and Heritage Buildings

Installing MVHR systems in heritage buildings is complex. These sites have planning restrictions, limited service voids and strict conservation rules. But the demand for better air quality and lower emissions still applies.

Architects in Hampshire, Berkshire and Surrey must balance ventilation performance with protection of historic fabric. The key is early coordination with an experienced MVHR partner who understands both systems and conservation.

This blog explains how to approach MVHR in listed buildings without risking planning rejection or damaging the building's integrity.

Why MVHR is valuable in heritage projects

Even listed properties can benefit from mechanical ventilation with heat recovery. MVHR:

• Reduces humidity and condensation in old fabric
• Improves air quality in sealed interiors
• Supports comfort without visible cooling or heating
• Helps meet Part F requirements
• Aids applications for sustainable retrofit funding

Many conservation planners now accept MVHR where systems are discreet and well integrated.

Risks of poor MVHR planning in heritage settings

Common issues include:

• Grilles on front facades breaching conservation rules
• Ducts disrupting original ceiling coving or beams
• Inaccessible units hidden in inappropriate voids
• Noise complaints due to rigid duct noise breakout
• Delays and redesigns after planning objections

These mistakes are avoidable with the right strategy and coordination.

Case studies

Grade II listed office in Winchester (Q4 2023)

The architect wanted discreet ventilation to support flexible workspace use. ClimateWorks designed a centralised MVHR system with slimline grilles hidden in decorative cornices. Roof grille positions were approved by conservation officers with no revisions needed.

Reading Georgian townhouse (Summer 2024)

MVHR was installed during a deep retrofit. All ductwork was routed through loft voids and into service risers. External terminals were painted to match existing brickwork, avoiding visual impact.

Oxfordshire estate cottage (Ongoing)

ClimateWorks is working with architects and planners to install MVHR into a rural property with thick stone walls. Detailed elevation drawings and noise maps were submitted to planning officers in May 2024.

Endorsements from architects

"They understood the sensitivity of the project and worked closely with our heritage consultant to get it right."
Heritage Architect, Winchester (2024)

"We were expecting pushback from planning, but their drawings and technical detail helped secure approval quickly."
Design Lead, Oxfordshire (2023)

How to approach MVHR in listed buildings

• Involve your MVHR partner before submitting planning
• Share elevations and roof layouts to assess grille options
• Use flexible ducts where voids are limited
• Include acoustic data and grille samples with your application
• Document how heritage fabric will be protected during install

This process improves your chance of approval and reduces delays.

Reference guidance

Architects should review:

• Historic England retrofit guidance
• UK Building Regulations Part L for carbon performance
• Ventilation guidance under PAS 2035 for retrofit compliance

These standards are shaping expectations from planners and clients alike.

Why ClimateWorks supports listed building success

• Experience delivering MVHR in heritage properties across Guildford, Petersfield and Newbury
• Drawings and documents ready for planning submissions
• Coordination with conservation officers and acoustic consultants
• Minimal-impact grille and duct routing solutions
• Install teams trained in working with listed fabric

We help architects deliver performance and protect heritage value in one solution.

About the author

Dr. Julian Carter
Thermal Systems Expert and Technical Advisor at ClimateWorks

Dr. Julian Carter is a highly experienced thermal systems expert with over 15 years in the field, holding a PhD in thermal systems. His career spans academic research, consulting and teaching, focusing on air conditioning and refrigeration systems. Dr. Carter bridges the gap between theoretical advancements and practical applications, providing expert insights to organisations like ClimateWorks, where his guidance informs decision-making and industry best practices. Notably, he has worked on international projects with organisations such as Daikin Industries, the International Institute of Refrigeration (IIR), and the United Nations Environment Programme (UNEP). Currently a lecturer at Edinburgh University, Dr. Carter combines his expertise with a passion for educating the next generation of engineers and advancing climate control technologies.

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