Cavity Wall Insulation has been surveying and installing in Cardiff for years — cavity-wall fill, loft top-ups, internal and external wall systems, and underfloor work. Cardiff sits on a band of older Victorian and Edwardian housing closer to the centre, with newer cavity-wall developments pushing outwards.
Cardiff sits on a band of older Victorian and Edwardian housing closer to the centre, with newer cavity-wall developments pushing outwards. We approach the two completely differently — breathable internal systems and lime-compatible details for the older fabric, standard CIGA-guaranteed bead for the modern stock.
Winters in Cardiff are damp rather than brutally cold, which means the real enemy is condensation in poorly ventilated rooms — bedrooms with single-skin extensions, north-facing kitchens and bathrooms without proper extraction. Insulation alone won't fix that; we always pair the install with a ventilation review.
Whatever your property type, we'll specify the right system. These are the services we install across Cardiff and the surrounding area.
Top-up or full re-lay to current depth standards, with hatch draught-proofing.
Bonded bead or blown fibre, drilled and pumped with a written 25-year guarantee.
Render-finish system for solid-wall homes — warmth and weatherproofing in one.
Slim breathable boards for listed and conservation properties.
Mineral wool or rigid board between joists; stops cold from below.
Safe foam removal from awkward voids, surveyed and extracted to current standards.
For the typical 3-bed semi in Cardiff, the highest-impact upgrades are (in order): cavity-wall fill if the void is empty or slumped, a loft top-up to 300 mm with proper hatch sealing, and draught-stripping the front door and ground-floor floorboards.
Our installers cover Cardiff most days of the week, with surveyors typically able to visit within 48–72 hours of a quote request. Same-week installs are usually achievable for straightforward cavity and loft work.
Four steps, no surprises. We follow the same process on every property in Cardiff.
A local surveyor visits, inspects the loft, walls and any exposed floor voids, and asks about damp history, ventilation and any planned building work.
Itemised by measure — loft top-up, cavity fill, EWI per elevation — with materials, guarantee scope and labour broken out separately. No surprise extras.
Two or three-person team, dust sheets down, all access points (loft hatch, drilled holes) reinstated and made good before we leave site.
Walk-through with the lead installer. You get the guarantee paperwork the same day and a follow-up call after the first heating month.
A few representative jobs from our recent work in and around Cardiff.
Underfloor insulation between joists on the ground floor and a full PIR rafter-line system in the new loft space. Pre-empted the building-control thermal requirements and let the homeowner skip retrofit corrections later.
Underfloor and skirting insulation on a single-storey park home that had been close to uninhabitable in winter. Used moisture-tolerant boards beneath the floor and breathable skirting infill. Owner reported the heating coming on half as often.
1960s cavity-wall property with original mineral fibre fill that had slumped on the gable. We extracted the failed material, refilled with bonded bead, and topped the loft from 100 mm to 300 mm. Owner reported the upstairs bedrooms holding heat through the night for the first time in a decade.
Insulation done badly is worse than no insulation. These are the issues we're called out to remediate most often in Cardiff.
Government schemes such as ECO4 and GBIS are available in Cardiff for qualifying households. Eligibility depends on income, benefits status and the EPC band of the property. Your surveyor will tell you in plain English whether you'll qualify and walk you through the paperwork if so.
All cavity-wall installs in Cardiff come with the independent CIGA 25-year guarantee, which is transferable if you sell the property. Loft and underfloor installs carry our own 10-year workmanship guarantee on top of the manufacturer warranty.
Yes. We regularly survey listed buildings and properties in conservation areas around Cardiff. The specification almost always uses breathable internal wall systems rather than cavity or external fill, and we'll handle the consents conversation with your local planning office if needed.
Someone over 18 needs to be on site at the start of the day to grant access and at the end for sign-off. You don't need to be present during the install itself — most cavity work happens externally and most loft work is contained to the loft space.
Yes. Cavity extraction is a service we offer across Cardiff as a standalone job or as part of a refill. We use specialist whirling-chain equipment to remove slumped or damp material before refilling with bonded bead.
Minimal. Cavity wall is mostly external — neighbours rarely realise it's happening. Loft work creates a couple of hours of activity in the access room below the hatch. We use dust sheets, leave the property clean, and put the loft hatch back as we found it.