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A resin floor is not a covering laid on a slab; it is a coating chemically bonded to it, mixed on site from two components that react and harden. In British homes the usual candidates are garages, workshops, utility rooms, boot rooms and converted basements — places where a seamless, washable surface with no joints for dirt to sit in is genuinely useful. The finish ranges from a thin roller-applied coating to a trowelled screed several millimetres thick.

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Because it cures in place, a resin floor is decided almost entirely by preparation and by conditions. The slab has to be mechanically prepared rather than just swept, its moisture state has to be known, and the temperature and humidity in the room during application and cure are part of the specification rather than a detail. A resin system applied to a dusty, damp or cold slab will fail, and it will fail as a sheet rather than in patches.

There is also a real health dimension that separates resin work from most other flooring trades. Uncured resins and their hardeners are skin sensitisers, and some topcoats and sprayed systems contain isocyanates, which HSE treats as a significant cause of occupational asthma. That is a matter for the contractor's own controls, but it also affects you: it shapes ventilation, how long the house is unusable, and when you can move back in.

Coatings, flake systems, self-smoothing resin and trowelled screeds

  • Roller-applied coating: the thinnest and cheapest option, two or three coats, suitable for a domestic garage that sees light use.
  • Flake or chip system: a base coat, broadcast decorative flakes and a clear sealer, which hides slab imperfections and adds texture underfoot.
  • Self-smoothing resin: poured and spread to a set thickness for a seamless, level surface, and the most demanding of the substrate beneath it.
  • Trowelled resin screed: heavily filled with aggregate and laid thicker, used where the slab is poor or the floor takes real punishment.
  • Polyurethane topcoat: applied over an epoxy body for better resistance to ultraviolet yellowing and to scuffing, and the layer most likely to contain isocyanates.
  • Moisture-tolerant primer systems: specified where a slab cannot be shown to be dry, and the deciding factor in whether the job can proceed at all.
  • Anti-slip aggregate: broadcast into the final coat where the floor will get wet, which changes the feel and the cleaning regime.

Uncured resin, hardeners and isocyanates: the health rules on a resin job

HSE names epoxy resins and hardeners explicitly in its guidance on skin problems in construction, in the same list as wet cement, acrylic sealants, bitumen, solvents used in paints and glues, and oils and greases. The condition it is warning about is occupational dermatitis, with symptoms it describes as redness, scaling or flaking, blistering, weeping, cracking, swelling, pain and itching — bad enough, in HSE's words, that people cannot carry on working. The controls it sets out follow the usual hierarchy: eliminate the substance, or substitute a less harmful one such as a water-based product; use tools like long-stemmed rollers that keep the material off the skin; and treat gloves as the last resort rather than the first answer.

The second hazard belongs to polyurethane topcoats and to anything sprayed. HSE states that spraying isocyanate products is a significant cause of occupational asthma, that symptoms can develop immediately after exposure but may also appear several hours later, in the evening or early morning, and that early warning signs include chest tightness, a persistent cough, wheezing, breathlessness and flu-like shivers. It is blunt about the consequence of continuing: you may suffer permanent and severe asthma, and there is no cure. Its expected controls are spraying in an enclosed area with local exhaust ventilation where possible, constant flow air-fed breathing apparatus, health surveillance including annual lung function testing, and biological monitoring by urine sampling.

All of this sits under the Control of Substances Hazardous to Health Regulations 2002, which require an assessment of the risk, controls to match, and a review of whether those controls are working. For a homeowner, two questions cover most of it: will anything be sprayed in my house, and what does the safety data sheet for each product say about ventilation and re-occupation. A contractor who has the data sheets to hand and answers in terms of them is the one to trust with a two-part product.

Why preparation is most of a resin floor job

  • Survey and moisture test the slab, because a resin film is impermeable and moisture arriving from below has nowhere to go but under the coating.
  • Mechanically prepare the surface by diamond grinding or shot blasting to open the concrete and remove laitance, curing compounds, paint and oil.
  • Expect the grinding to be done wet or with extraction on the machine, because opening up a concrete slab releases respirable crystalline silica and HSE holds that it must be stopped from getting into the air.
  • Deal with contamination: old oil in a garage slab has usually soaked in, and a patch that will not clean is a patch where the resin will not bond.
  • Repair and fill cracks, joints and spalled areas with a compatible mortar before any coating goes on.
  • Prime, using a moisture-tolerant primer if the readings require it, and observe the overcoat window the manufacturer states.
  • Apply the body coats and any broadcast flake or aggregate, working to the stated wet film thickness rather than by eye.
  • Seal, then leave it alone: light traffic and full chemical cure happen on different timescales, and furniture or a car on a floor that is walkable but not cured is how a new floor gets marked.

Primers, moisture-tolerant systems and why mixing brands fails

A resin floor is a system, not a set of separate products, and that is the single most useful thing to understand when comparing quotes. The primer, the body coat, any aggregate and the topcoat are formulated to bond to each other within stated recoat windows, and substituting one layer from a different range is the most common cause of a floor that delaminates a year later. Ask for the system to be named as a system, and for the primer to be named specifically, because that is the layer most often dropped to make a price competitive.

The moisture question is where domestic projects most often come unstuck. A garage slab poured decades ago, or a basement floor with no effective damp-proof membrane, may be passing moisture upward steadily without anyone noticing, because whatever was on it before let the moisture through. Seal it under an impermeable coating and the pressure has somewhere to collect, which shows up as blisters or as a sheet of resin that lifts cleanly off the concrete. The answer is either a moisture-tolerant primer or damp-proof membrane system rated for the measured condition, or not coating the floor at all. A contractor who quotes without testing has not priced this risk; they have transferred it to you.

Blisters, pinholes, amine blush and a floor that never hardens

  • Blisters or bubbles under the film, usually osmotic pressure from moisture in the slab rather than anything that happened during application.
  • Pinholes, caused by air escaping from a porous slab as the resin cures, and normally prevented by the right primer rather than by a thicker topcoat.
  • Amine blush, a greasy or cloudy film that forms when an epoxy cures in cold, humid conditions and stops the next coat bonding.
  • Soft or tacky areas where the two components were not mixed to the right ratio or were not scraped fully out of the tin.
  • Delamination in sheets, which almost always means the slab was not mechanically prepared or was contaminated with oil.
  • Yellowing of a clear epoxy where daylight reaches it, which is why a polyurethane topcoat is specified in a garage with a window or glazed door.
  • Hot-tyre pickup in a garage, where a warm tyre lifts a poorly bonded coating as the car is moved after standing.

Ventilation, re-entry and living in the house while a floor cures

Resin flooring is one of the few domestic jobs where the programme is set by chemistry rather than by labour. Each product states a pot life once mixed, an overcoat window, a time to light foot traffic and a longer time to full cure, and none of them can be shortened by goodwill. The room also has to be within a temperature and humidity band during application and cure, which in an unheated British garage in February may simply not be achievable without temporary heating and dehumidification. A quotation that does not mention conditions has not thought about this.

The occupancy question follows from the health section. Solvent-containing products and anything sprayed need ventilation during and after application, and the safety data sheet will say what is required and when the space can be reoccupied. In a garage with the door open this is straightforward; in a converted basement or a utility room inside the house it needs planning, especially where there are children, pets or someone with asthma in the household. Ask for the data sheets before the work is booked, agree when the space is usable and when it is fully cured, and agree who is responsible for keeping people and animals off it in between.

What drives an epoxy flooring quote, and how LokalMatch fits in

The resin is rarely the biggest line. A quotation is driven by the condition of the existing slab and how much grinding or shot blasting it needs, whether oil or old coatings have to be removed, how many cracks and joints need repairing, whether a moisture-tolerant primer or membrane system is required, the system specified and its total thickness, whether flake or anti-slip aggregate is broadcast in, the number of coats, and how much of the work has to be done by hand around drains, steps and doorways. Access and temperature matter too, because a cold garage may need heating before anything can be applied.

LokalMatch is where the comparison starts rather than where the work happens. Describe the floor once with your postcode — the room, roughly the area, what the slab has on it now and what you want the finish to cope with — and resin flooring pros covering your area contact you. Posting the job costs a homeowner nothing, and the pros pay for the enquiries they receive. LokalMatch does not lay resin floors, does not set prices and does not vet, rank or recommend any contractor who responds, so asking each of them about moisture testing, the primer and the safety data sheets is the part that stays with you.

Epoxy Flooring: frequently asked questions

Can epoxy be applied straight onto an old garage slab?

Not straight onto it, no. The slab has to be mechanically prepared by diamond grinding or shot blasting to remove laitance, curing compounds, paint and oil and to open the surface so the resin can bond, and it has to be moisture-tested first because a resin film is impermeable. Oil that has soaked into a garage floor over decades is the classic problem: an area that will not clean is an area where the coating will lift. A contractor who proposes to degrease and roll straight on has skipped the part that decides whether the floor lasts.

Is epoxy flooring safe to have done in an occupied house?

It can be, with planning. HSE names epoxy resins and hardeners among the substances that cause occupational dermatitis in construction, and says that spraying isocyanate products is a significant cause of occupational asthma, with symptoms that can appear hours later and a warning that continued exposure can cause permanent, incurable asthma. The work falls under the Control of Substances Hazardous to Health Regulations 2002. Ask whether anything will be sprayed, ask for the safety data sheets, and agree ventilation and when the space can be reoccupied before the job is booked, particularly if anyone in the house has asthma.

Why has my epoxy floor blistered?

Blisters under the film are usually moisture in the slab rather than a fault in the application. A resin coating is impermeable, so moisture that used to evaporate harmlessly through the old surface collects beneath the new one and pushes it off. Pinholes are a different failure, caused by air escaping from a porous slab during cure, and are normally solved by the right primer rather than by a thicker topcoat. Both are preventable by measuring the slab's moisture state before quoting and specifying a moisture-tolerant primer or membrane where the reading calls for one.

How long before I can park on a new resin floor?

Longer than you can walk on it. Every resin system states two separate times: one to light foot traffic and a longer one to full cure, and a car is not light traffic. Putting a vehicle on a floor that is walkable but not fully cured is how a new garage floor picks up tyre marks or, worse, hot-tyre pickup where a warm tyre lifts the coating. The times are temperature-dependent, so a cold garage in winter cures more slowly than the data sheet's headline figure. Get both times written into the quote.

Can a resin floor be laid over underfloor heating?

Usually yes, but the commissioning sequence matters and it has to be agreed in advance. The heated screed needs to have been brought up to temperature and back down before the coating goes on, so that the slab has done its initial movement and drying, and the manufacturer will state a maximum surface temperature for the finished floor that the heating controls must respect. Get written confirmation that the specific system is approved over the specific heating installation, rather than a general assurance that resin and underfloor heating are compatible.

Sources

  1. HSE: skin problems in construction, including epoxy resins and hardeners
  2. HSE: construction hazardous substances, isocyanates and spraying
  3. HSE: Construction dust, Construction Information Sheet No 36
  4. HSE: COSHH basics

Written by the LokalMatch editorial team. Last reviewed 21 September 2026. How we write and check our guides

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What affects the cost of epoxy flooring

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Floor area and the number of rooms
  • Type and grade of flooring
  • Removal of the existing floor
  • Subfloor repairs or levelling
  • Stairs, angles and custom cuts
  • Trim, transitions and baseboards

How to compare epoxy flooring installers before you hire

  • Choose an installer who works regularly with the type of flooring you want, since hardwood, tile, vinyl and carpet each need different skills.
  • Ask them to check the subfloor and moisture levels before giving a final price.
  • Get a written quote that covers removal of the old floor, subfloor prep, underlay, trim and transitions.
  • Ask whether you or the installer will supply the flooring, and who is responsible for ordering extra for waste.
  • Look at recent work in person or in photos, paying attention to seams, edges and transitions.

Questions to ask epoxy flooring installers before you hire

  • Will you remove and dispose of the old flooring?
  • How will you check and prepare the subfloor?
  • Is my space suitable for this type of flooring, especially in a basement, kitchen or bathroom?
  • Are baseboards, transitions and stair nosings included?
  • Will you move the furniture and appliances, or should I?
  • Does your workmanship warranty cover problems like lifting, gaps or cracked tiles?

Epoxy flooring permits and local rules

Some epoxy flooring work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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