You will need listed building consent to install damp proofing in a listed building. While addressing damp is essential to the long-term performance and sustainability of historic buildings, it must be approached with care.
Guidance such as BS 7913: 2013 recognises the impact of damp on building performance, reducing the energy efficiency of walls by over a third. This is especially important given that 32% of listed buildings in England experience problems with damp, mould and condensation.
In this blog, we take a closer look at what listed building consent means, why damp proofing is treated differently in historic buildings, and how conservation principles support a more informed, holistic approach to dealing with damp.
What Is Listed Building Consent?
Listed building consent is permission granted by your local authority for works that would affect the character or appearance of a listed building, as well as proposals to incorporate new types of materials. Its purpose is to ensure that any changes are carefully considered and justified.
Consent may be required for works that appear minor. Even replacing doors or windows, altering internal finishes, or painting interior or exterior surfaces can require approval. This is because listed status applies to the entire building, including its internal fabric, fixtures and materials. For the same reason, damp proofing works will require listed building consent, unless they comprise minor repairs such as repairing leaking gutters.
Why Damp Proofing Often Needs Listed Building Consent
Damp proofing often requires listed building consent because, if undertaken incorrectly, it can have a detrimental and lasting impact on historic buildings.
Traditional structures were designed to manage moisture differently from modern construction systems, relying on breathable materials and the natural movement of moisture rather than barriers and seals. A common problem is that approaches developed for modern buildings are often applied to listed buildings without sufficient understanding of their construction.
The Consequences of Poorly Informed Damp Proofing
Measures such as injected chemical damp proof courses, cement renders, impermeable plasters, or replacing timber floors with concrete may be intended to resolve the damp. However, these interventions often alter a building’s hygrothermal performance, trapping moisture within the fabric. This can result in persistent damp and mould problems, as well as long-term damage to the building.
As the consequences of poorly informed damp proofing can be severe and irreversible, listed building consent acts as an important safeguard. It ensures that any proposed works are properly assessed and that retrofit measures are informed by an understanding of traditional materials, construction methods and building pathology.
Specialist training is helping address knowledge and skill gaps. Courses such as the Level 3 Award in Damp, Mould and Condensation in Buildings and Level 3 Award in Energy Efficiency for Older and Traditional Buildings equip professionals and contractors to take a more informed, conservation-led approach. Each reflects best practice in managing damp, mould, and retrofit in older and traditional buildings.
Can You Damp Proof a Listed Building?
While damp, mould and condensation problems can be resolved in a listed building, this rarely involves conventional damp-proofing methods.
Moisture enters buildings through a range of mechanisms. In traditional construction, this is closely linked to how materials absorb, store and release moisture over time. Interventions that work by blocking moisture movement may conflict with the way historic buildings were designed to function.
Non-chemical, low-intervention measures are often more compatible with traditional construction, as they work with the building’s existing materials rather than against them. Any remedial works must consider how traditional and historic buildings manage moisture as part of their normal performance.
Guidance such as the British Standard for dealing with moisture in buildings BS 5250: 2021 and the ‘Joint Position Statement – Investigation of moisture and its effects on traditional buildings: Principles and competencies’ emphasises the need for appropriate assessment and material compatibility when addressing damp in historic buildings. BS 7913 further highlights the importance of proper condition surveys based on an understanding of building pathology and traditional materials, essential when considering the impact of problems like damp.
Taking an Informed Approach to Damp in Listed Buildings
Listed building consent is often required for damp proofing in listed buildings, ensuring that any damp-related works are justified, compatible with traditional construction and informed by an understanding of building pathology, significance and performance.
Damp problems in listed buildings are rarely solved through standard damp-proofing solutions. Instead, they require careful inspection and analysis to determine the causes of moisture, along with an understanding of the building’s historic structure, location, and setting.
Specialist training plays an important role in this process. Courses such as the Environment Study Centre’s Level 3 Award in Damp, Mould and Condensation in Buildings and Level 3 Award in Energy Efficiency for Older and Traditional Buildings help building professionals make informed decisions that protect both the performance and heritage value of listed buildings.
