If your home in Cardiff feels harder to keep warm than it should, the loft may be part of the reason. In many cases, the existing insulation simply is not doing enough by modern standards.
Cardiff Council participates in Wales-specific grant schemes alongside UK-wide BUS — Nest and Arbed programmes are available for Welsh residents.
Grant delivery: Wales has separate schemes — Nest and Arbed alongside UK-wide BUS. Administered by Cardiff Council.
Local priority: Loft and cavity wall insulation — Wales is served by the Nest / Warm Homes Programme (WH:LG is England-only).
Did you know? A significant amount of heat — often around a quarter — can escape through the roof if your insulation isn’t up to modern standards. Heat rises, and without effective insulation, it escapes — increasing energy bills and reducing comfort in your home. The right insulation can make a real difference.
Cardiff local note: — higher than the Wales average. With many properties fall in EPC bands D–G, Cardiff is a priority area for Government-funded insulation. Check Welsh support routes — the Nest / Warm Homes Programme — plus GB-wide ECO4 and the Boiler Upgrade Scheme for current eligibility.
We help homeowners across Cardiff and the surrounding area compare the right insulation options for their property.
We’ve helped homeowners across Cardiff and the surrounding area and surrounding areas. Our installer partners cover Cardiff and the surrounding area.
Many homes across Cardiff may not have insulation that meets modern standards. A page targeting Cardiff should feel locally relevant but still useful. That means the advice stays focused on what homeowners actually need to know before requesting a quote.
Many Cardiff properties have insulation that is no longer meeting modern standards. Cardiff properties, like many UK homes, benefit from effective loft insulation to reduce heat loss and lower heating costs throughout the year.
Across the UK, homes without adequate loft insulation lose up to 25% of their heat through the roof alone. For Cardiff's housing stock, which spans a range of construction eras,cavity (post-1920) and solid (pre-1920), upgrading to modern standards can deliver £150–£350 in annual energy savings with a payback period of just 2–4 years.
Upstairs rooms noticeably colder than ground floor
High heating bills that don’t respond to thermostat adjustments
Condensation on windows or mould in bedroom corners
Loft insulation visibly thin, patchy, or absent
Home cools rapidly when heating is switched off
Cold draughts at floor level or around doors
Independent scores across 5 factors. No manufacturer pays to rank higher.
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Check My Home in 30 Seconds →| Type | Cost (Cardiff) | Annual Saving | Payback | Score | Mortgage Risk |
|---|---|---|---|---|---|
| Foil Insulation Top Pick | £200–£600 | £150–£250 | 1–3 years | application-dependent | ✓ None |
| Fibreglass (Mineral Wool) | £300–£500 | £100–£200 | 2–4 years | 7.5/10 | ✓ None |
| Loose Fill | £350–£600 | £100–£180 | 2–5 years | 6.8/10 | ✓ None |
| Cavity Wall | £400–£800 | £150–£250 | 2–5 years | 6.0/10 | ✓ None |
| Spray Foam ⚠ | £1,000–£2,500 | £100–£200 | 8–15 years | 4.0/10 | ✗ Major Risk |
We do not recommend spray foam insulation for most Cardiff properties. It scores 4.0/10 due to significant mortgage and resale risks. See our spray foam risks guide before making any decisions.
ECO4 (Energy Company Obligation) is currently the primary government-backed scheme for insulation support and runs until 31 December 2026. The Great British Insulation Scheme (GBIS) closed on 31 March 2026 and is no longer accepting applications. Eligibility for ECO4 depends on household income, benefit entitlement, and EPC rating. We can do a quick eligibility check as part of our free assessment.
Our installer partners check your eligibility for all available funding schemes as part of the free survey — at no cost or obligation to you.
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