Wall assessment and moisture survey
Check the wall build-up, exposure and any existing damp before specifying a system, because insulation fitted over damp traps problems behind it.
Service
Internal wall insulation for hard-to-treat homes
Warm solid walls and a better EPC rating without changing how your home looks from outside.
Older, solid-walled properties throughout Blackburn, Lancashire, and the surrounding areas possess enduring architectural charm, yet they represent some of the most thermally inefficient and hard-to-treat homes in the UK. Properties built without a cavity wall lose up to forty-five percent of their generated heat directly through the external brickwork and stonework, resulting in chilly living spaces, persistent wall dampness, and soaring heating bills. Internal Wall Insulation (IWI) provides the definitive technical solution for these solid-wall residences, locking in thermal comfort and drastically improving statutory Energy Performance Certificate (EPC) ratings without altering external stone or protected historic facades.
Successful internal wall insulation demands rigorous technical design and deep moisture management expertise. Installing insulation incorrectly over uninspected substrates can trap interstitial condensation within the wall structure, leading to hidden rot and mould growth. We begin every project with a comprehensive damp and masonry assessment, verifying that the exterior brickwork is sound and weathertight before work begins. We specify high-performance rigid insulation boards or independent timber stud build-ups with continuous vapour control layers (VCL) and breathable membranes, ensuring the building envelope can breathe naturally while providing an impenetrable barrier against heat loss.
Beyond standard wall surfaces, our technical teams focus meticulously on thermal bridging details around window reveals, external door frames, intermediate floor joists, and ceiling junctions. Thermal bridges are the primary cause of cold spots and localised condensation in poorly executed insulation projects. By wrapping reveals with slimline aerogel or high-density phenolic insulation and taping all joints with airtight specialist membranes, we ensure complete thermal continuity throughout each room. The transformation is immediate: exterior-facing walls feel warm to the touch, draughts are eliminated, and radiant heat remains trapped inside your living areas for hours.
We deliver internal wall insulation as a complete, multi-trade turnkey service designed to minimise disruption to your daily household routine. Our teams take care of every detail, including the professional extension of electrical sockets, plumbing adjustments for radiator re-hanging, skirting board reinstatement, and precision plaster skimming to a mirror-smooth finish ready for immediate decoration. By coordinating insulation, joinery, and plastering under one unified team, we deliver a seamless, high-performance transformation that raises your home’s energy efficiency rating, meets stringent landlord MEES compliance standards, and provides lasting warmth and comfort.
What this covers
Below is the breakdown of the specific jobs we handle under this service. Most enquiries are one or two of these rather than the whole list — if you are not sure which applies, describe what is happening and we will tell you.
The work
What we do under internal wall insulation
Insulated plasterboard systems
The most common internal approach, giving a warmer wall surface and reducing the risk of condensation on cold spots.
Timber stud and insulation build-ups
Where walls are uneven or services need rerouting, a stud build-up carries the insulation and provides a service void.
Thermal bridging and airtightness detailing
Detailing at reveals, junctions and joist ends, which is where most of the heat performance is actually won or lost.
Making good, skim and finish
Plastered, ready-to-decorate surfaces so the insulation disappears into the room.
Process
How this service runs
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01
Tell us what is wrong
A phone call or a message through the form. We ask enough questions to understand the job properly rather than pencilling in a guess.
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02
Survey and written quote
Where a survey is needed we attend, look at the actual building, and follow up with a written quotation setting out scope, materials, timescales and assumptions.
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03
Agree the work and the date
You approve the quote, we agree access, parking and sequencing, and you get a date that does not move without a reason.
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04
Work done and handed back
The work is completed, the site is left clean and tidy, and you get the paperwork you need for warranty, letting or compliance.
Questions
Internal Wall Insulation: common questions
Will internal insulation make my rooms smaller?
It reduces floor area slightly along the insulated walls. Thickness depends on the target performance, and we tell you the trade-off before you commit.
Can it cause damp?
Badly specified internal insulation can. That is why assessment, correct vapour control and careful detailing come before any boards go up.
Do I need to move out during the work?
Usually no. Work is done room by room, and we sequence it so you keep a usable home.
Also worth looking at
Related services
These are the services most often booked alongside this one.
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Heat pumps, hydrogen-ready boilers and smart controls, fitted to today's efficiency standards.
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Boiler Maintenance & Replacement
Keeping your boiler safe, efficient and reliable — or replacing it when repair stops making sense.
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EPC Assessments
Know your rating, understand what is driving it, and get a plan you can afford to follow.
Learn moreReady to talk about internal wall insulation?
Tell us what needs doing and we will arrange a survey and a written quotation. No working prices over the phone, no surprises on the invoice.