“How much does a mastic man cost?” is one of the first things people ask when a bath seal turns black or the mastic around a window starts to crack. The honest answer is that it depends on the job: how much old sealant has to come out, what it’s sealing, how easy it is to reach and how many joints there are.
This guide walks through the things that change the cost, quotes the price ranges that well-known UK cost guides have published, and explains what a good quote should cover so you can compare like with like. We don’t publish prices for our own work, because two jobs that sound the same rarely are. Call for a quick quote and we’ll give you a clear, fixed price before we start.
What a mastic man actually does
“Mastic man” is the everyday name for a specialist who removes and replaces sealant. Most of the work falls into a few groups:
- Bathrooms and kitchens: baths, shower trays and enclosures, basins, wet rooms, worktops, sinks and upstands.
- Windows and doors: the external mastic between the frame and the wall, sills, patio and French doors, and the internal joint between frame and plaster.
- Movement and floor joints: brickwork, render and cladding joints, skirting-to-floor gaps and concrete floor joints.
- Specialist work: fire-rated sealant, glazing silicone, and traditional sand mastic around sash and case windows.
The visible part, the new bead, is the quick bit. Most of the time goes into taking the old sealant out completely, cleaning the joint, treating mould and letting it dry. That preparation is also what decides how long the new seal lasts.
What affects the cost
These are the things that move the price up or down on almost every sealant job:
- The amount of old sealant. A thin, single bead comes out quickly. Thick layers, sealant laid over sealant, or old mastic that has gone rock hard take much longer.
- Mould and damp. If mould has grown under the bead or the joint is wet, it has to be treated and dried before anything new goes on.
- The number of joints and their length. One bath is a short job. A full bathroom with a bath, shower, basin and floor junctions is several.
- Access. Ground-floor windows are straightforward. Upstairs frames, high-level movement joints or tight corners behind fixed fittings take more time and sometimes more equipment.
- The product. Anti-fungal sanitary silicone, low-modulus exterior sealant, hybrid sealant, fire-rated sealant and sand mastic all cost different amounts and suit different joints.
- Joint size and backing. Wide or deep gaps may need backing rod so the sealant is the right depth.
- Location and timing. Labour costs vary around the country, and out-of-hours work for commercial sites takes planning.
What published UK price guides suggest
Several UK websites publish typical price ranges. They are a useful starting point, but they are national guides, not quotes, and they were written by other companies. These are the figures as published when we checked them in October 2026:
| Job | Published range | Source |
|---|---|---|
| Bath reseal | £50–£100 | Checkatrade bath reseal cost guide |
| Bath or shower reseal | £60–£150 | mastic-man.co.uk price guide |
| Full bathroom reseal | £120–£300 | mastic-man.co.uk |
| Kitchen worktop, sink and splashback | £60–£150 | mastic-man.co.uk |
| External window or door frame mastic | £25–£60 each | mastic-man.co.uk |
| Whole-house windows and doors (3-bed) | £250–£600 | mastic-man.co.uk |
| Expansion or movement joints | £8–£20 per metre | mastic-man.co.uk |
| Floor joints | £6–£18 per metre | mastic-man.co.uk |
| Small / medium / large window reseal | £80–£110 / £85–£120 / £90–£125 | MyJobQuote window and door resealing guide |
| Standard uPVC door reseal | £100–£160 | MyJobQuote |
| Sealant removal only | £60–£100 | MyJobQuote |
| Window reseal | £125–£180, quoted + VAT | Checkatrade window seal guide |
A few points of context. Checkatrade’s bath guide was marked as updated in July 2026 and its window guide in June 2026. MyJobQuote’s page was dated September 2026 and says London labour costs about 20% more than other areas. The mastic-man.co.uk directory guide shows no date and says its figures are guide ranges, not quotes. All of these are other companies’ figures, not ours.
Why two quotes for the same job can differ
If you get two quotes that are far apart, it’s usually because the two people are planning to do different jobs. Things to check:
- Is one of them planning to cut out all of the old sealant, and the other going over the top? Sealing over old silicone is quicker, and it fails. Our guide on sealing over old silicone explains why.
- Does the quote include mould treatment and time for the joint to dry?
- Is the product named? A general-purpose silicone and an anti-fungal sanitary silicone are not the same thing in a shower.
- For windows, does it include backing rod where gaps are deep, and both inside and outside joints, or only one?
- Is there a minimum charge, and is VAT included?
The cheapest quote can be the most expensive one if the seal fails in six months and has to be cut out again.
Need it done properly? Mr Mastic covers the South East, London and Scotland, with a one-year guarantee on every job. Call or email for a quick quote.
What a good quote should include
A clear quote for sealant work should tell you, in writing:
- Exactly which joints are included (for example: bath, shower tray, basin, kitchen worktop and sink).
- That the old sealant will be removed completely, not covered over.
- How the joint will be cleaned and how any mould will be treated.
- The type of sealant and the colour.
- Whether backing rod or primer will be used where needed.
- Roughly how long the work will take, and how long to leave it before it gets wet or is used.
- What guarantee comes with the work. Ours is a one-year guarantee on every job.
- The total price, and whether VAT is included.
If anything on that list is missing, ask. A good applicator won’t mind.
DIY or professional?
A single bath or basin is a job plenty of people do themselves, and our step-by-step guide on how to reseal a bath covers it. DIY makes sense when the old bead comes away cleanly, there’s no mould underneath and you have the patience to let the joint dry properly.
It’s worth paying for a professional when:
- the sealant has been laid over old sealant and is lifting;
- a shower keeps leaking after being resealed;
- mould keeps coming back within months;
- the joints are outside, high up, or wide enough to need backing rod;
- you have several bathrooms, rental properties or commercial washrooms to get through.
The tools are cheap. The time and the finish are what you are really paying for.
Ways to keep the cost sensible
- Group jobs together. Having the bath, shower, basin and kitchen done on one visit is more efficient than four separate visits.
- Don’t wait for a leak. Replacing a tired bead is a short job. Repairing a ceiling, a rotten floor or a swollen worktop is not.
- Send photos. Clear photos of each joint, close up and from a step back, help us give a clear quote quickly.
- Clear the area. Moving toiletries off the bath edge and clearing anything stored on the worktop saves time on the day.
- Look after the new seal. Good ventilation and wiping the joint down after use help it last longer, which means paying for a reseal less often.
Landlords, agents and commercial sites
If you manage several properties, a hotel or a commercial building, the cost question changes. A planned programme, done room by room or property by property, is usually more efficient than calling someone out each time a tenant reports black mould. It also gives you a record of what was done and when.
For commercial and hotel work we can arrange early starts or out-of-hours working, so the building keeps running. Tell us the number of rooms or areas, the working hours you need and any paperwork your site requires, and we’ll quote for the whole programme. Our commercial sealant page has more detail.
How Mr Mastic quotes
We’ve been doing this work for more than 20 years, we’re fully insured and we are an ARBOMaster approved applicator. We use Arbo (Arbosil) and Everbuild sealants, chosen for each joint.
We don’t publish a price list, because the cost depends on what we find. Call for a quick quote: tell us what needs sealing, send a few photos if you can, and we’ll give you a clear quote with a fixed price before we start. Every job comes with our one-year guarantee. You can contact us here.
Quick answers
How much does it cost to reseal a bath in the UK?
Published guides suggest a range: Checkatrade’s bath guide gives £50–£100 and the mastic-man.co.uk directory gives £60–£150. Your price depends on the old sealant, any mould and access.
Why don’t you publish your prices?
Because jobs that sound the same often aren’t. We give a clear quote after a quick call, with a fixed price before we start.
Is it cheaper to reseal everything at once?
Usually it’s more efficient, because preparation and travel are shared across several joints on one visit.
Does the price include removing the old sealant?
It should. Always check that a quote includes full removal, cleaning and mould treatment, not sealing over the top.
What guarantee do you give?
Every Mr Mastic job comes with a one-year guarantee.
Related services
More advice
- How to Reseal a Bath (and When to Call a Pro)
- Can You Put New Silicone Over Old Silicone?
- How to Choose a Mastic Man: 10 Questions
- How Long Does Silicone Sealant Last?
- All advice
This guide is general information about sealant work. It isn’t legal, fire-safety or structural advice; for those, speak to a qualified professional.