EPC Llantwit Major

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What is an EPC?

An Energy Performance Certificate (EPC) tells you how energy efficient your home or property is on a scale of A-G with A being the most energy efficient and G being the least. They are valid for 10 years and give advice on how to make your home more energy-efficient by making small changes such as improving insulation and sealing windows/doors. These certificates are required by law when renting out a property or selling it for the first time.

Why do Homeowners and Landlords Need One?

Having an EPC can save you money in the long run as it helps identify ways that you can make your home more energy-efficient which will result in lower energy bills. It also allows prospective tenants and buyers to see how much they could potentially save if they moved into an energy-efficient property. Furthermore, having an EPC can help increase a property’s market value as it allows potential buyers to accurately compare different properties based on their energy efficiency ratings. Lastly, landlords in Llantwit Major must have an EPC before they can legally rent out a property, so if you are looking to rent out your home then getting an EPC should be at the top of your list.

Government Regulations

The Welsh Government has introduced legislation that requires all landlords in Llantwit Major and throughout Wales to have a minimum of Grade ‘E’ on their EPC before they can legally rent out their property from April 1st 2018 onwards. The government has also introduced funding schemes such as ECO3 which provide grants towards insulation costs for both homeowners and landlords who meet certain criteria. It is important that homeowners and landlords in Llantwit Major familiarize themselves with these new regulations before renting out their properties as failure to comply may result in hefty fines from local authorities.

What Happens During an Assessment?

The DEA will examine the outside of your property, including the walls and roof, to determine the age, construction type, roof type, number of extensions, and detachment. They will also inspect the brickwork to identify the insulation’s presence and the building’s structural integrity. For instance, if your property is relatively new or renovated, the DEA will immediately conclude that it’s energy efficient, which will impact the EPC rating.

Moreover, the DEA will record the type and thickness of the insulation to evaluate the thickness and efficacy of the insulation material. They’ll also note the placement of the windows, doors, and any other building materials that can impact the property’s energy performance. Additionally, the DEA will verify the access points, including the gates, fences, and external doors’ locks. It’s critical to ensure the assessor has easy-to-use access to the external parts of the property.

The assessor needs access to all the rooms within the property, but they also need access to the attic or loft, which may be inaccessible. By providing access to the loft, the assessor can assess the insulation used, whether batts or loose-fill and determine if it meets the minimum standards required by the building regulations. The DEA will require adequate lighting to perform the assessment and ensure safety while entering and exiting the attic or loft.

During the DEA’s visit, all pets must be secured and kept far away to avoid any disturbance or injury. If the property is vacant, keys to every external door, fence, gate or any access point must be available. On the day of the EPC assessment, it is advisable not to plan any other activities around your home or rental property in Llantwit Major to accommodate the DEA’s visit.

Not sure whether the property already has a valid certificate? find your property’s EPC on the government register in seconds.

EPC data for Llantwit Major

Figures below are for Vale of Glamorgan, the local authority covering Llantwit Major, from the Energy Performance of Buildings Register to 2026 Q2.

2,455EPCs reach their 10-year expiry in the next 12 months
Band CThe most common rating, on 51% of certificates
43%Rated D or below, against 46% nationally
£1,024Average estimated heating cost a year

That expiry count is certificates lodged ten years ago and now coming up for renewal. Some of those homes have already been re-certified since, which authority-level data cannot show, so treat it as the ceiling rather than a to-do list.

How Vale of Glamorgan rates

Share of the 14,805 certificates lodged in the five years to 2026 Q2. This is the certificates lodged, not a survey of every home in the area.

What gets assessed around here

69% of the certificates lodged here are for houses. The average floor area is 96.1m², roughly 11m² larger than the England and Wales average. Estimated heating costs average £1,024 a year, £85 a year above the national figure. 39% of certificates were lodged for rented homes.

Radon in Llantwit Major

Llantwit Major sits in a radon Affected Area. The UKHSA and British Geological Survey put the 1km square covering the town centre in a band where between 10 and 30 in 100 homes are estimated to be at or above the radon action level of 200 becquerels per cubic metre. Radon is not measured during an EPC survey and does not affect the rating, but if you are buying, selling or improving a home here it is worth a test kit, and worth knowing before you seal a property up: draught-proofing and insulation work can raise indoor radon if ventilation is reduced. The atlas is indicative and works to a 1km grid, so it describes the area rather than any one property.

What an EPC costs in Llantwit Major

An EPC around here generally costs between £55 and £150, though it depends on the property: floor area, whether there are rooms in the roof, extensions, and how far the assessor travels all move the price. We are not a panel and we do not set anybody's fees, so the figure you are quoted comes from the assessor doing the work. Contact one above for a price on your property.

Sources: MHCLG Energy Performance of Buildings Certificates live tables, 2026 Q2; UKHSA and British Geological Survey Indicative Atlas of Radon. Prepared 2026-09-11.

What to expect when a Domestic Energy Assessor comes to your property

Every Domestic Energy Assessor / DEA will have their own order and format of carrying out the EPC depending on the software that they use and their personal preference to efficiency.

Frequently Asked Questions

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