South Wales & South West England

Stop Losing 35% of Your Heat Through the Walls

Kiwa-certified Climabead EPS bead fill, installed to PAS2030 in a single day. Free surveys across South Wales, South West and West England.

PAS2030 Certified
TrustMark Approved
0% VAT on insulation
0808 502 2308
Free survey, no obligation, honest pricing and clear timelines
Cavity wall insulation injection in progress
Up to £200/yr Saved
Typical 3-bed South Wales home
TrustMark Certified
Government-Endorsed Quality
4.4
Google Rating
Verified reviews
500+
Installations Completed
Across South Wales and beyond
10
Industry Accreditations
More than any local competitor
£200
Up to £200/yr Saving
Typical 3-bed South Wales home
01
The Problem

Your Walls Are the Biggest Source of Heat Loss in Your Home

Walls account for around 35% of the heat lost from an uninsulated home. More than the roof. More than the floor. If your external walls feel cold, rooms never feel warm enough, or the heating runs constantly, your cavity walls are almost certainly the reason.

Empty cavity means constant heat loss. Most South Wales homes built 1930-1990 have two layers of brick with a gap between. If that gap was never filled, cold air circulates and heat escapes straight through.
New boiler, new windows, loft done — and still no saving? It's often because the walls were never addressed. They're the piece most homes are still missing.
One of the highest-return home improvements. Modest cost, payback in a few heating seasons. Cavity wall insulation is one of the most cost-effective upgrades available.
Where Heat Escapes in a Typical Home
Approximate heat loss by source, uninsulated property
Walls
35%
Roof / Loft
25%
Windows + Doors
25%
Floor
15%
Walls are the single biggest source of heat loss. Combined with loft insulation, the two measures together account for around 60% of the total.
Cavity wall insulation being injected into the external walls of a South Wales home
02
The Solution

Climabead EPS Fill, Completed in a Single Day

Cavity wall insulation fills the gap between the two layers of your external walls.

We install Climabead — a Kiwa-certified EPS bead system. Small 22mm holes are drilled into your external mortar joints, and the beads and adhesive are injected under controlled pressure.

The holes are then filled and colour-matched to your existing mortar. The adhesive binds the beads so they stay put for the life of the building.

35%
Of home heat lost through uninsulated cavity walls
Addressing walls alone makes more difference than any other single insulation measure available to most South Wales homes.
1
Suitable for properties built 1920 onwards
Cavity construction was standard across South Wales from the 1920s. Older solid-wall properties need internal wall insulation instead. Our survey confirms construction type before any quote.
2
Cavity condition assessed first
We check cavity width, existing fill, damp and pointing condition. Our ABBE-qualified surveyors only proceed when the property is suitable.
3
Climabead, Kiwa-certified to BAW 18-043
Closed-cell EPS beads (2-9mm) bonded with acrylic adhesive. Water resistant, does not allow water to cross the cavity, structurally stable for the life of the building. All work to PAS2030 standard.
03
The Benefits

What Changes When Your Walls Are Properly Insulated

Lower Heating Bills
With 35% of heat loss addressed, your boiler works less to hold the same temperature. Typical 3-bed South Wales semi saves around £175–£200 a year.
Warmer Rooms on Outer Walls
Exterior walls feel warmer to the touch. Rooms against gable walls that never felt properly warm become genuinely comfortable, noticeable from the first heating season.
Completed in a Single Day
Most South Wales semis and terraces are finished in a single working day. Work is external, no disruption inside, no need to move furniture.
Appearance Unchanged
Drill holes are filled and colour-matched to existing mortar. Virtually undetectable once finished. No change to wall thickness, no planning implications.
Works Alongside Other Measures
Walls and roof together account for 60% of a home's heat loss. If your survey shows you need loft insulation too, we handle both in the same project.
04
Is It Right For You

Is Your Property Suitable for Cavity Wall Insulation?

Cavity wall insulation suits a large proportion of South Wales homes, but not every property qualifies. Here is an honest picture before you get in touch.

A good fit if...
Your home was built between 1920 and 1990. This covers most semis, terraces and detached homes across Carmarthenshire, Swansea, Cardiff and Newport.
Your cavity has not been filled before. Your EPC report usually shows this, we confirm it at survey.
External walls are in good condition, no significant damp, no defective pointing.
You want a fast, one-day install from a PAS2030-certified team with a clear written quote.
You also need loft insulation. Combining both at once tackles over 60% of your home's heat loss. More on loft insulation.
May not be the right approach if...
Your home was built before 1920 with solid stone or brick walls. No cavity to fill, you'd need internal wall insulation instead.
Existing damp or defective pointing on external walls. Insulating a damp wall makes damp worse, we won't proceed until it's resolved.
The cavity has already been filled. If old fill has failed, extraction is the first step.
Very exposed coastal location where driven rain is a significant risk. We assess this at survey and advise honestly.

Not sure whether you qualify? Book a free survey. No cost, no obligation, straight answer.

4.4
Google Reviews
View All Google Reviews
"Absolutely first class from start to finish"
The survey was thorough, the quote was detailed and honest, and the installation team were professional throughout. The system has been running perfectly and the bills are noticeably lower. Could not recommend First Choice Energy highly enough.
Luke Jenkins
Swansea, South Wales
Google Review
"Professional, knowledgeable and honest"
I appreciated that they were upfront about what the work involved and what it would cost. No hidden extras on the invoice, the job was done on time, and they explained everything clearly afterwards. A company that actually does what it says it will.
Dan Evz
Cardiff
Google Review
"From the initial survey to completion, excellent"
The whole process was straightforward. The survey was free and no-pressure. The quote was fair and clear. The installation was completed in a single day with minimal disruption. I feel confident I made the right decision.
Sarah B.
Bristol
Google Review
05
The Process

What Happens After You Get in Touch

From first contact to finished install, here's exactly what to expect.

01
Free Survey
Our ABBE-qualified surveyor inspects the external walls, checks construction type, cavity width, damp and pointing. No cost, no obligation.
Within 5 working days
02
Written Quotation
Clear written quote with specification, coverage area, any prep work needed and the total price. No surprises, decide at your own pace.
Within 48 hours of survey
03
Installation Day
22mm holes drilled in the external mortar joints. Climabead EPS beads and adhesive injected under controlled pressure. Holes filled and colour-matched. Entirely exterior work.
Typically a single day
04
Quality Check and Sign-Off
We walk you around the finished work, confirm the drill holes are colour-matched, and complete your PAS2030 handover paperwork on the day.
Same day
05
You Start Saving
Benefit begins immediately. From the first cold night, your walls retain heat instead of losing it. Difference is noticeable within the first heating season.
Immediate benefit
06
Why Us

Why Homeowners in South Wales Choose First Choice Energy

PAS2030 certification, ABBE-qualified surveyors and a NEBOSH-qualified director aren't standard across the industry. They're what separates a serious insulation company from a contractor who drills holes and drives away.

01
PAS2030 Certified, The Retrofit Quality Standard
PAS2030 is the retrofit quality standard for certified insulation work. Our certification is held through Blueflame. Check PAS2030 before committing to any insulation installer, it's not optional on quality work.
02
ABBE-Qualified Surveyors
Our ABBE-qualified assessors carry out a proper survey before any work begins. Problems with cavity insulation almost always trace back to poor pre-install assessment. Ours is thorough.
03
NEBOSH-Qualified Director
Aaron Davies holds a NEBOSH qualification in Health and Safety Management for Construction (June 2025). Working-at-height, tool use and access protocols set by the director, applied across every job.
04
Full Service Under One Roof
Cavity wall, loft, internal wall, extraction and ventilation. If your survey shows you need more than one measure, we handle everything in a single project under the same quality standard.
Cavity wall insulation case study, injection process through neat drill pattern
Installation Case Study

Cavity Walls Filled in a Day, Cold Rooms Gone, ~£180/yr Saved

A Swansea homeowner · 3-bed semi-detached, Swansea · Climabead EPS fill
The Problem
Loft done years earlier, but the front reception and main bedroom stayed cold all winter. Heating ran morning to late evening without the house feeling settled. EPC D rating.
The Survey
Cavity construction throughout. No previous fill. Cavity width suitable, pointing good, no damp. Recommendation: Climabead EPS fill to all external walls.
The Installation
Climabead EPS and adhesive injected to all external walls in a single day. Drill holes filled and colour-matched. PAS2030 paperwork completed on the day.
The Result
External walls noticeably warmer within days. Through the first heating season, rooms held temperature with less heating time. Estimated annual saving around £175-£180.
~£180
Estimated annual saving
1 day
Total installation time
35%
Heat loss source addressed
07
Certified

Certified for Retrofit and Insulation Work

PAS2030 is not optional for cavity wall insulation. Everything else reflects the quality standard applied to every installation we complete.

PAS2030 Certified
The retrofit quality standard for energy efficiency measures. Required for all work. Held through Blueflame. Ensures the right specification is installed in the right property.
TrustMark
Government-endorsed quality scheme. Consumer protection and independent redress for home improvement work across the UK.
Trading Standards Approved
TSI Approved Code of Practice. Consumer protection for sales, marketing and contract conduct. Independently monitored compliance.
ABBE Qualified
Assessor qualifications for retrofit and energy assessment. Ensures proper surveys are conducted before any cavity wall installation proceeds.
Competent Persons Scheme
Self-certification for building regulations compliance. Work certified without a separate building notice where applicable.
NEBOSH Director
Aaron Davies, NEBOSH Health and Safety Management for Construction, June 2025. Safety standards applied from the director level on every FCE installation.
08
Pricing

Honest Pricing. 0% VAT. One-Day Installation.

Cavity wall insulation is zero-rated for VAT as an energy-saving material. Most households recover the outlay within 3-5 heating seasons. Prices below are indicative, your exact quote is confirmed at free survey.

Supply & Fit
Smaller Property
Terraced or smaller semi-detached. Typically 2-3 bedrooms, good access to all elevations.
Supply and fit from
£400 – £600
0% VAT included. Exact price confirmed after free survey.
Includes: free survey, Climabead EPS and adhesive, injection to all external walls, hole filling and colour matching, PAS2030 sign-off.
Most Common
Supply & Fit
Standard Semi or Detached
3-4 bedroom semi-detached or detached with gable walls included.
Supply and fit from
£600 – £900
0% VAT included. Exact price confirmed after free survey.
Includes: free survey, Climabead EPS and adhesive, injection to all external walls including gable ends, hole filling and colour matching, PAS2030 sign-off.
0% VAT on insulation
Under the UK energy-saving materials scheme, cavity wall insulation is zero-rated for VAT. The prices above include this. Finance options including 0% APR are available on qualifying installations, subject to status.
What Affects the Final Price
Property size and wall areaLarger properties have more external wall area. We measure at survey and price accordingly.
Number of elevationsFully detached with four exposed walls sits at the higher end of the range. Semis with party walls at the lower end.
Cavity width and accessCavity must accept the Climabead EPS. Restricted access to some elevations may affect time and equipment.
09
FAQ

Questions We Get Asked Every Week

Honest answers to what South Wales homeowners ask before booking a cavity wall survey. If yours isn't here, call or request a callback.

How much does cavity wall insulation cost?
Typically £400 to £900 supply and fit, depending on property size and access. 0% VAT is included. Exact price confirmed after free survey.
How do I know if my home has cavity walls?
Most UK homes built between 1920 and 1990 have cavity walls. Measure the external wall at a window reveal, 250-300mm thick usually means a cavity. Your EPC report will also show it, and we confirm definitively at survey.
How long does the installation take?
Most semis and terraces are done in a single day. Larger detached properties may take slightly longer. Work is external, you can stay in the house throughout.
Can cavity wall insulation cause damp?
Not when correctly specified and installed in a suitable property. Historic damp problems trace back to poor pre-install assessment, properties with existing damp, defective pointing or exposed coastal positions. Our ABBE-qualified surveyors check for all of these before we recommend the work.
My house was built before 1920. Can I still have insulation installed?
Pre-1920 properties usually have solid walls with no cavity. You'd need internal wall insulation instead, which we also install.
What if the insulation ever needs to be removed?
Correctly installed fill in a suitable property rarely needs removal. If old fill has failed or major works are planned, we offer cavity wall extraction as a separate service.
Should I get cavity wall and loft insulation at the same time?
If you need both, yes. Walls account for 35% of heat loss, the roof another 25%. Tackling both in one project maximises the bill reduction. See our loft insulation page.
Will the drill holes be visible afterwards?
Holes are about 22mm across. They're filled with mortar mix and colour-matched to your existing pointing. Within a few weeks they're virtually undetectable.
What material do you use for cavity wall insulation?
We install Climabead — Kiwa BDA Agrément certified EPS beads (2-9mm, 12kg/m³ density) bonded with an acrylic adhesive. Water resistant, does not allow water to cross the cavity, structurally stable for the life of the building. Certificate BAW 18-043-S-A-UK.
Free Survey, No Obligation

Stop Losing Heat Through Your Walls

If your home was built between 1920 and 1990 and has never had cavity wall insulation, you're likely losing up to 35% of your heat through the walls. Free survey takes under an hour. Written quote, no pressure to proceed.

PAS2030 certified installation
ABBE qualified surveyors
0% VAT on insulation
Completed in a single day for most properties
Serving South Wales, South West and West England
0808 502 2308
Free survey, no obligation, written quote at no charge
Book Your Free Cavity Wall Survey
Free survey, eligibility check, written quote, all at no charge.
Thank you, we will be in touch within one working day to arrange your free survey.