Radiators are one of those fixtures that quietly date a room. A yellowing cast-iron column in an Islington mansion block or a grubby panel rad in a Hackney conversion can drag down an otherwise freshly decorated flat. The good news: a properly painted radiator looks factory-fresh, holds up to heat cycles, and costs a fraction of replacement. Here is how we approach it — and why the method matters as much as the paint.

Preparation: the step that determines the result

Radiator paint fails for one reason: poor prep. Heat expands metal and contracts it again every day, so any paint applied over grease, rust, or a poorly keyed surface will bubble and flake within months. Our process starts with the rad cool and off — we never paint a warm radiator.

Degrease: Sugar soap or a dedicated degreaser removes years of dust, cooking residue, and handling oils. On column rads with tight fins, we work into every crevice — this is where shortcuts show up later.
Key the surface: Fine-grit wet-and-dry paper scuffs the existing finish so the new paint can bond. On heavily rusted areas we use a rust converter before priming.
Prime if needed: Bare metal or areas treated for rust get a metal primer. Painted rads in reasonable condition can go straight to topcoat once keyed.
Fill and spot-repair: Old cast-iron rads often have minor dings or paint chips; these get filled and sanded smooth before topcoating.

Heat-resistant enamel: choosing the right paint

Standard emulsion or satinwood will not survive a radiator. We use heat-resistant enamel formulated to withstand temperatures up to around 120°C — well above what a domestic central heating system produces. Dulux Trade's radiator range is our default; for clients who want a specific shade matched to a Little Greene or Farrow and Ball wall colour, we tint specialist enamel to order or use the manufacturer's own radiator paint where it exists.

Finish choice is mostly aesthetic: satin gives a softer, contemporary look; gloss is traditional and easier to wipe clean. On period properties with ornate column rads, gloss tends to suit the architecture.

Hand-painted vs spray: why we hand-paint in occupied London homes

Spray painting delivers a flawless, factory-smooth finish — in a workshop, or in an empty property with every surface masked. In an occupied London flat it creates serious practical problems:

Overspray travels. Even with careful masking, atomised paint drifts onto walls, floors, soft furnishings, and electronics. In a small London flat with open-plan living, the risk is high.
Masking is extensive. To spray a single radiator safely, you would need to mask or remove everything within a metre or two — furniture, flooring, the wall behind. That is a half-day job before a brush is lifted.
Removing the radiator is often impractical. Taking a rad off the wall to spray it properly means draining the system or isolating it, which in a leasehold flat or a shared system can require the freeholder or managing agent's sign-off.

Hand-painting with a high-quality bristle or short-pile foam roller gives a finish that is smooth, durable, and achieves in an occupied home what spray can only do in a controlled environment. On column radiators with complex fins, a radiator brush — long-handled, angled — reaches every surface cleanly. Two topcoats are standard; on heavily used or visible rads we sometimes apply a third.

Colour-matching to your walls

White is the default, but it does not have to be. Matching the radiator to the wall colour — particularly popular in period conversions where the rad is a visual feature rather than an afterthought — creates a clean, considered finish. We can colour-match to any Dulux Trade shade, and on request to Little Greene, Mylands, or Farrow and Ball palettes. If you want the radiator to disappear into the wall, we match wall paint to a heat-resistant version of that colour. If you want it as a design feature, a contrasting satin enamel in a deeper tone works well on cast-iron columns.

The no-van, by-tube trim service

One of the questions we hear most from London flat-owners is: "Is it worth calling out a decorator just for a radiator?" Our woodwork and trim service is set up exactly for this — we travel by tube or on foot, carrying materials in a bag, with no van to park and no congestion charge to pass on. A single radiator starts from £65; most jobs take two to three hours including drying time between coats. We often combine a radiator with skirting boards or a door in the same visit, which keeps the day rate efficient for you.

For London flats in CPZ areas or buildings without parking, this matters: you are not paying for a van sitting on a yellow line or a congestion charge bill added to the invoice.

What to expect on the day

We ask that the radiator is off and cool for at least an hour before we arrive. We protect the floor and surrounding wall with dust sheets and masking tape, degrease and key, and then work through the coats with drying time between each. For a standard panel radiator, the whole process from arrival to clear-up is typically two to three hours. Cast-iron column rads with many fins take longer — budget three to four hours for a thorough job.

The finish is hard to the touch within an hour or two, but we recommend leaving the heating off for 24 hours before running it, then gradually bringing the temperature up over the first few cycles to cure the enamel properly.

Ready to refresh your radiators?

Whether it is one yellowing panel rad in a bathroom or a row of original cast-iron columns in a Victorian conversion, we can have them looking clean and sharp in a single visit. Get an instant quote — just tell us the number of radiators and your postcode, and we will come back to you promptly.

Radiator Painting in a London Flat: Hand-Painted vs Spray (2026)