Older and period properties present unique challenges when it comes to EPC ratings and energy efficiency. Across Oxfordshire, many rental properties are built from Cotswold stone, feature solid walls, or fall within conservation areas or listed building designations. These factors can make standard energy improvements difficult or impossible to implement.
This page provides practical guidance for landlords of older properties in Oxfordshire, covering what affects your EPC rating, what improvements are realistic, and how to navigate planning and heritage restrictions.
Why Older Properties Score Lower on EPCs
The EPC assessment methodology is based on standardised assumptions about building performance. Older properties typically score lower because of:
- Solid walls: Most pre-1920s properties have solid stone or brick walls with no cavity to insulate. Solid walls lose heat much faster than insulated cavity walls.
- Single glazing: Many period properties retain original single-glazed windows, which are a significant source of heat loss.
- Older heating systems: Properties may have outdated boilers, inefficient radiators, or limited heating controls.
- Draughts: Older buildings tend to be less airtight, with gaps around windows, doors, floors, and chimneys.
- Limited loft insulation: Some older properties have restricted loft access or roof structures that make insulation difficult.
Common Property Types in Oxfordshire
Oxfordshire’s housing stock includes a wide range of older building types, each with its own energy challenges:
Cotswold Stone Properties
Found throughout West Oxfordshire and parts of the Cherwell district, these properties have thick stone walls that provide some thermal mass but score poorly under EPC assessments due to their high U-values. External or internal wall insulation may be restricted in conservation areas.
Victorian and Edwardian Terraces
Common in Oxford, Banbury, and other town centres, these properties often have solid brick walls, original sash windows, and suspended timber floors. They typically score in the D to F range without improvements.
Thatched and Timber-Framed Properties
Found in villages across the county, these require specialist assessment and careful consideration of moisture management. Standard insulation approaches may cause condensation and damage.
Listed Buildings
Properties with Grade I, Grade II*, or Grade II listing have legal protections that restrict alterations. Any changes that affect the character of the building require listed building consent from the local planning authority.
Realistic Improvements for Older Properties
While some standard measures may not be suitable, there are still practical steps you can take:
- Loft insulation: Often possible even in older properties, provided the loft space is accessible. Use breathable insulation materials in properties where moisture management is important.
- Heating system upgrades: Replacing an old boiler with a modern condensing model is usually permitted, even in listed buildings. Adding thermostatic radiator valves and a programmer can also help.
- Secondary glazing: Where replacement windows are not permitted, secondary glazing can reduce heat loss while preserving the original windows. This is often an acceptable solution in conservation areas.
- Draught-proofing: Sealing gaps around windows, doors, and floors is low-cost, usually non-invasive, and can be carried out without planning permission.
- Hot water cylinder insulation: A simple and effective improvement if the property has a hot water tank.
- Internal wall insulation: In some cases, thin internal insulation boards can improve thermal performance without significantly reducing room sizes. This needs careful specification to avoid moisture problems.
For a broader overview of improvement options, see our page on how to improve an EPC rating for a rental property.
Planning and Heritage Considerations
If your property is listed or in a conservation area, you will need to consider:
- Listed building consent: Required for any works that affect the character of a listed building, including window replacement, external insulation, and sometimes internal alterations.
- Conservation area restrictions: Replacing windows, changing roof materials, or adding external insulation may require planning permission and must respect the character of the area.
- MEES exemptions: If planning restrictions prevent you from making necessary improvements, you may qualify for a consent exemption or a wall insulation exemption under MEES regulations.
Getting the Right Assessment
Older properties benefit from being assessed by an experienced Domestic Energy Assessor who understands the construction types common in Oxfordshire. The way an assessor records wall type, window age, and insulation levels can significantly affect the final score.
For more on how assessment changes can affect your rating, see our page on whether EPC ratings drop over time.
Frequently Asked Questions
Are listed buildings exempt from EPCs?
Listed buildings are exempt from needing an EPC only if compliance would unacceptably alter their character or appearance. This exemption is not automatic and must be assessed on a case-by-case basis. If an EPC has been produced, MEES regulations apply.
Can I insulate solid stone walls?
Internal wall insulation is sometimes possible, but it must be carefully specified to manage moisture and avoid damage to the building fabric. External insulation is rarely permitted on period properties in Oxfordshire due to conservation and visual impact considerations.
What if I cannot improve my property to EPC E?
If you have made all reasonable improvements and the property still falls below E, you may be able to register an exemption on the PRS Exemptions Register. See our page on what happens if a rental property falls below EPC E for more detail.
Book an EPC Assessment
E8 Property Services has extensive experience assessing older and period properties across Oxfordshire. We understand the construction types common in the area and can provide practical advice alongside your assessment.
Book an EPC assessment or call 01865 339535 to discuss your property.