Customer Reviews & Testimonials
Discover how we help homeowners, landlords, and commercial clients across South Wales and the South West eliminate cold houses, reduce energy bills, and cure damp issues. Read feedback from our valued clients.
PAS 2030 Compliant
Fully Accredited Retrofitters
SWIGA Backed
Solid Wall Insulation Guarantees
CHAS Accredited
Highest Safety Standards
End-to-End Service
With Sister Co. Global Plastering
Verified Customer Feedback
We pride ourselves on our meticulous workmanship, high-performance insulation systems, and beautiful exterior rendering finishes. Here are some of our latest verified customer experiences.
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Transforming Properties in South Wales & South West
From treating persistent cold walls to updating outdated, cracked facades, we specialise in complete retrofitting services across Rhondda Cynon Taf, Cardiff, Swansea, Bristol, and beyond.
Complete Solid Wall Insulation & Rendering Project
This Victorian solid wall property suffered from extreme heat loss, damp penetration, and sky-high heating bills. Our PAS 2035 retrofit coordinators structured a whole-house energy assessment before installing premium External Wall Insulation (EWI) with a weather-resistant, clean silicone render finish.
By combining our thermal insulation expertise with the clean finishing services of our sister company, Global Plastering, we provided a seamless end-to-end service with zero stress for the homeowner.
"The house is unbelievably warm now, and the damp is completely gone. The team was fast, clean, and highly professional throughout the entire installation. Our energy bills have dropped dramatically!" — Property Owner, CardiffLearn more about External Wall Insulation →
Providing Warmth For All Property Types
We understand that each building type demands specific thermal treatments. Our accredited team has successfully retrofitted, insulated, and rendered varied housing styles across our 50–60 mile operating radius.
Terraced House Solid Wall Treatment
Rhondda Cynon Taf
"Living in a Victorian terraced home, we struggled with cold drafts and black mould. Global Energy Insulation installed Internal Wall Insulation (IWI). Their sister company Global Plastering then skimmed the walls to a flawless, smooth finish. Outstanding service."
Non-Traditional Build Insulation
Swansea
"We own a Wimpey no-fines concrete property. It was impossible to keep warm. The team handled the planning requirements effortlessly, installed External Wall Insulation, and finished it with a stunning K Rend render. The improvement is night and day."
Landlord HMO Energy Upgrade
Bristol
"I needed to bring my HMO properties up to EPC rating standards ahead of MEES compliance deadlines. Global Energy Insulation carried out loft and internal wall insulation across my portfolio. Highly recommended commercial contractors."
Why Property Owners Trust Global Energy Insulation
Based in Ferndale, South Wales, we serve communities across Cardiff, Swansea, Newport, Merthyr Tydfil, Caerphilly, and over the bridge into Bristol, Bath, Gloucester, and Somerset.
- PAS 2035 & 2030 Compliant: Fully accredited for government retrofit schemes, guaranteeing high engineering, layout, and ventilation controls.
- SWIGA Backed: Our solid wall works are registered and backed by the Solid Wall Insulation Guarantee Agency, giving you complete insurance-backed security.
- Complete Finish Integration: We work in synergy with our sister company, Global Plastering, ensuring interior walls affected by drylining are rendered perfectly smooth.
- Licensed & Insured: Full Public Liability insurance, registered waste carriers licence, and CHAS accreditation for peace of mind. (Registered Co No: 05875199).
Need an assessment? Call our team directly at 01443 809770.
Frequently Asked Questions
Have questions about our installation processes, accreditations, or service guarantees? Find answers here.
Are your insulation and rendering services guaranteed?
Yes. Our External Wall Insulation (EWI) installations are backed by the Solid Wall Insulation Guarantee Agency (SWIGA), providing long-term, insurance-backed peace of mind. Other services feature comprehensive guarantees on both materials and workmanship.
Do you handle the plastering finishes internally?
We offer a complete end-to-end service. While Global Energy Insulation handles thermal upgrades and external renders, our sister company, Global Plastering, conducts all interior skimming, drylining, and traditional plastering. You won't have to hire different contractors.
How do I know if my property requires planning permission for external rendering or EWI?
EWI and external rendering generally fall under permitted development unless your property is a listed building, situated within a conservation area, or if the upgrade significantly alters the appearance from neighbouring properties. Our team provides complete guidance on local planning rules and compliance checks.
What is PAS 2035 and why does it matter?
PAS 2035 is the UK framework for designing and installing energy efficiency measures in existing homes. Working with a PAS 2035 accredited contractor ensures your project is comprehensively assessed to prevent unintended consequences (like ventilation or condensation issues) and meets eligibility requirements for eco grants.
Request a Retrofit Assessment or Quotation
Ready to make your home warmer and cut down on rising energy costs? Or did we recently complete work on your property and you'd like to reach out? Get in touch with our friendly team.
We serve a 50–60 mile radius from our headquarters in Ferndale, RCT, covering Cardiff, Newport, Swansea, Bridgend, Caerphilly, Brecon, Bristol, Bath, Gloucester, and Somerset.
Direct Contact Details:
- Office Address:
- Phone: 01443 809770
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