Thin internal wall insulation for solid-wall homes

Warmer walls. Lower heat loss. No lost room space.

Designed for solid-wall homes where traditional internal insulation steals space, creates disruption, or simply doesn't make sense.

Heat Halo is a spray-applied internal wall insulation coating, built up in controlled layers directly onto solid walls and finished with a sprayed plaster skim and decoration — leaving the room looking completely normal.

The result: warmer-feeling walls, rooms that retain heat for longer, and a more comfortable home through winter.

For homeowners

I own a solid-wall home.

Find out if Heat Halo is the right answer for your property — and how the cost compares with a standard replaster and redecoration.

Internal wall insulation for solid-wall homes → For Housing Associations

We manage solid-wall stock.

Explore a structured pilot for 5–20 dwellings. Independently tested results, full QA documentation per property, low disruption to residents.

Housing association retrofit pilot →

Independent performance evidence

Measured. Verified. Here's what it shows.

Build Test Solutions Ltd tested Heat Halo under BS EN ISO 9869 — the standard for in-situ measurement of real-world wall performance — with an untreated control room on the same wall throughout.

16% Reduction in heat loss through the treated wallMeasured U-value improvement
~28% Lower measured heat loss than the untreated control wallPost-installation comparison
+2–3°C Average increase in internal wall surface temperatureMeasured during the BTS test
~25% Typical improvement for an average solid-wall homeTypical 2.0 → 1.5 W/m²K equivalent

A construction system — not a paint.

Heat Halo is spray-applied in controlled layers by trained specialist contractors, then finished with a sprayed plaster skim. Performance comes from the system as a whole: survey, preparation, controlled application to a defined coating thickness, skim finish and installation quality — not a tin and a roller.

Read about the evidence →

Independently tested under BS EN ISO 9869 in a live occupied property. See the full methodology →