Modern house with exposed blockwork prepared for external wall insulation and rendering in South Wales

Internal Wall Insulation in Y Gelli Gandryll / Hay-On-Wye , Powys

Call Your Local Y Gelli Gandryll / Hay-On-Wye Expert
07393 355531
Serving Y Gelli Gandryll / Hay-On-Wye & Powys

Professional Internal Wall Insulation in Y Gelli Gandryll and Hay-On-Wye

If you live in an older property in Y Gelli Gandryll or Hay-On-Wye, you are likely familiar with the struggle of cold walls and soaring energy bills. At Global Plastering, we specialise in internal wall insulation for homeowners looking to improve thermal comfort without altering their property’s exterior. Whether you reside in a charming Victorian terrace or a solid-wall detached home, our team provides tailored retrofit solutions designed to keep your living spaces warm throughout the year.

South Wales and South West England

07393 355531

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Our Trusted Partners & Brands

Freshly plastered and skimmed white walls in a modern dining room completed by Global Plastering in South Wales
PAS 2030 Accredited IWI Installers

Expert Internal Wall Insulation Across South Wales

Based in Ferndale, Global Plastering provides highly efficient internal wall insulation (IWI) for properties throughout a 60-mile radius, covering South Wales and South West England. From solid wall Victorian terraces to complex commercial retrofits, our PAS 2035 compliant solutions drastically reduce heat loss, lower soaring energy bills, and instantly improve your EPC rating.

Why is internal wall insulation the right choice for your property?

Many homes in the Powys area feature solid wall construction, which often acts as a major source of heat loss. By installing high-performance thermal boards or insulated stud-wall systems internally, we create an effective barrier that stops heat from escaping through the walls. This process is particularly beneficial for properties where external wall insulation is not possible, such as those in conservation areas or buildings where maintaining the original exterior aesthetic is essential. Beyond the immediate warmth, our work helps address issues like cold bridging and condensation, significantly improving your home's overall EPC rating.

Our step-by-step installation process

When you choose Global Plastering, you benefit from a professional, end-to-end service. We begin with a thorough survey to assess your property's specific requirements, ensuring compliance with PAS 2035 retrofit standards. Our experienced technicians then carefully prepare the walls, ensuring any existing damp issues are managed before fitting the insulation. Once the high-quality thermal boards are secured, we finish the interior with professional skimming and dry-lining, leaving your walls smooth and ready for decoration. This meticulous approach ensures that your home remains comfortable and structurally sound for years to come.

Expertise in solid wall and period properties

Specialising in older buildings requires a deep understanding of building physics. We have extensive experience working on Victorian and Edwardian properties, as well as non-traditional building types found throughout South Wales and Powys. We recognise that these buildings need to breathe, which is why our installation methods are strictly damp-aware and compliant with current building regulations. By choosing our PAS 2030 compliant services, you are investing in a sustainable future for your property, whether you are a private homeowner or a landlord striving to meet MEES requirements for rental units.

Trusted quality with insurance backed guarantees

We pride ourselves on providing complete peace of mind for all our clients in Y Gelli Gandryll and Hay-On-Wye. As a CHAS accredited company, we uphold the highest standards of safety and workmanship. Furthermore, our insulation projects come with SWIGA insurance-backed guarantees, ensuring that your investment is protected. We are committed to decarbonisation and energy efficiency, helping you lower your carbon footprint while enjoying a more comfortable home. To discuss your project or to book a free, no-obligation retrofit survey, please reach out to our expert team today on 07393 355531.

Why Choose Global Plastering?

Your trusted, PAS-accredited experts in internal wall insulation, delivering outstanding energy efficiency and flawless finishes across Ferndale, South Wales, and the South West.

Local South Wales Experts

Based in Ferndale, we cover a 60-mile radius through to Bristol. We possess deep expertise in retrofitting Victorian, terraced, and solid wall properties.

Fully PAS 2030 Accredited

We are fully PAS 2030 compliant and CHAS registered. We provide comprehensive SWIGA insurance-backed guarantees for absolute peace of mind.

Flawless Plastered Finishes

Internal wall insulation involves careful dry-lining and skimming. As highly experienced plasterers, we ensure your newly insulated walls are impeccably smooth.

Lower Bills & Better EPC

Tackle soaring energy costs, draughts, and cold spots. Our tailored IWI solutions reduce heat loss and guarantee vital improvements to your property's EPC rating.

Internal wall insulation being installed with Mannok PIR boards between timber studs in a South Wales property.
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Plastering Services Across South Wales and South West England: 07393 355531

What Our Clients Say About Global Plastering

"Excellent work the team removing our old 1970's cladding and replacing it with insulation and a rendered finish. The job went smooth from start to finish with all old materials removed from site. We are very pleased with the end result and would thoroughly recommend Global Plastering."

A. Jenkins (Ferndale)

"Dilwyn and his team were brilliant and made a lovely job of our EWI. They were very friendly, hard-working, and left no mess at the end of each day. Our house looks great and we can definitely feel the benefits of the insulation already. I'm very glad we chose EWI especially with energy costs as they are now."

G. Toogood (Bristol)

"Charlotte and the team were professional, reliable, and excellent at communicating throughout. They did a fantastic job of skimming and rendering the back of our house during our renovation. Superb quality of work and highly recommended!"

M. Lewis (Cardiff)

FAQ

Frequently Asked Questions

Answers to common questions about our internal wall insulation services, heat loss solutions, and PAS 2030 compliant retrofits in South Wales and South West England.

How much space will I lose inside my rooms?

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This is a common concern for homeowners in Ferndale. Modern high-performance insulation boards are incredibly efficient, meaning we can achieve great thermal results with relatively thin materials. You will typically lose about 60mm to 100mm on the treated walls. Most customers find this small trade-off is well worth it for a home that is significantly warmer and cheaper to run.

Will IWI cause damp or condensation in my home?

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When installed correctly by experts like us, IWI actually helps reduce the risk of surface condensation. By warming up the internal surface of the wall, you remove the "cold spot" where moisture in the air usually settles. We use vapour control layers and ensure proper ventilation is maintained to keep your home healthy and breathable.

Can I still hang pictures and shelves on insulated walls?

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Yes, you certainly can. While you need to be mindful of the depth of the insulation, we can advise you on the best fixings to use. For heavy items like radiators or kitchen cupboards, we plan ahead and install "pattresses" or extra timber supports behind the boards during the installation process.

Is there a lot of mess during the installation?

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We won't sugar-coat it—any internal work involves some disruption. However, we pride ourselves on being respectful guests in your home. We cover flooring, protect your furniture, and clear away all debris. Because we are professional plasterers by trade, we ensure the finish is top-tier, leaving you with a blank canvas ready for paint.

Still have questions? Contact our South Wales and South West England Plastering experts today!

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Proudly Serving South Wales & South West England

Global Plastering are your trusted, PAS 2030 accredited insulation and rendering experts. Based in Ferndale, Wales, we cover a 60-mile radius, providing high-quality external wall insulation (EWI), internal wall insulation (IWI), and premium silicone rendering to reduce energy bills and transform cold houses. Explore our primary service areas below.

Our Key Service Areas

South Wales

  • Rhondda: Ferndale, Pontypridd, Porth
  • Cities: Cardiff, Swansea, Newport
  • Surrounding: Bridgend, Merthyr Tydfil
  • Specialists in upgrading terraced and solid wall homes
  • Experienced in Cornish and Airey non-traditional builds

South West England

  • Bristol and the M4 Corridor
  • Bath, Gloucester, and Cheltenham
  • North Somerset and surrounding borders
  • Expert rendering for Victorian and Edwardian properties
  • Commercial insulation and decarbonisation projects

PAS Accredited Experts

  • Fully PAS 2030 and PAS 2035 compliant
  • SWIGA insurance-backed guarantees provided
  • CHAS registered for commercial health & safety
  • Deep understanding of MEES compliance for HMOs

Book a Free Retrofit Survey

Contact Global Plastering today for a no-obligation quote on insulation, rendering, or plastering across Wales and the South West.

Call 07393 355531

If your specific location within our 60-mile radius isn't listed, please don't hesitate to get in touch. We cover all domestic, commercial, and landlord properties within this area.

Our Operating Radius & Coverage

Map shows our primary service areas across South Wales and South West England.

Book Your Free Internal Wall Insulation Survey Today!
Call South Wales and South West England's Trusted Plastering Experts on 07393 355531