The Mastic Doctor team standing beside their branded vans outside an office building
Greater London · England

Washroom Sealing contractors in Dulwich

Sealant work in Dulwich for main contractors, managing agents and facilities managers: sealing in commercial washrooms, showers, kitchens and wet areas, quoted at a fixed price.

  • Resealing that didn’t last because the old bead stayed
  • Open joints at the base of cubicle panels
  • Washrooms that look worn because of the sealant
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
London, the South East & Scotland
CHAS accredited
£5m PL insurance

Washroom sealing in Dulwich

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

Washroom sealing in Dulwich

Black spotting along a sealant bead is not a cleaning problem. The growth is inside the sealant, which is why it comes back however often it is treated. Replacing the bead is the lasting treatment. If you have stained sealant around pans and urinals and failed sealant behind washroom basins, we can help, on accessible toilets and changing rooms, showers, trays and wet room floors and IPS panels and cubicles alike. Most enquiries from Dulwich start with one failed joint and grow into a wider look at the building: we check the joints around it and give you an honest view of what needs doing now and what can wait.

In Dulwich, as across London, commercial kitchens and washrooms need sealed joints that can be cleaned properly. Hygienic and anti-mould sanitary sealants are used where they suit, with food-safe products where food contact is possible.

A 12-month guarantee applies to all our work in Greater London. Should something we installed fail, ring 01277 525 020 or send details through our quote form and we’ll come back to it.

Where
Dulwich (SE22, SE21, SE23)
Wider area
Greater London
Cover
12 months on every job
Quote
A fixed quote before we start
Phone
01277 525 020
Last updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

Commercial clients in Dulwich

For main contractors, we work as the sealant subcontractor on new-build and refurbishment projects. Programme, specification and site rules come first, with CSCS-carded applicators on site.

We take on planned maintenance as well as one-off repairs: resealing failed joints building by building, on a schedule that suits your budget. Sites in Dulwich can sit alongside others in a wider programme across Greater London.

Washroom sealing in Dulwich: the local picture

There are several hotels within about 2 miles of Dulwich. Hotel en suites take daily use, and tired silicone at trays and basins is one of the first things guests notice. We work a handful of rooms at a time, so the hotel keeps letting the rest. In London buildings, toilets and showers generally need to stay partly open, so we take one block of facilities out of use at a time.

Healthcare washrooms on sites such as Maudsley Hospital (1.7 miles north of Dulwich) are resealed area by area, under the site’s own infection-control rules. In a centre such as Bell Green Retail Park, 2.2 miles south-east of Dulwich, public washrooms are resealed a block of facilities at a time.

Dulwich is about 1 mile south-east of Herne Hill, in Greater London. Our applicators travel to Dulwich for work on washrooms and wet areas, handled exactly as we handle every other area. Dulwich is one of 764 places in Greater London on our list for washrooms and wet areas.

We cover the SE22, SE21 and SE23 postcode districts. For a building on Court Lane, Druce Road and Boxall Road or nearby, we can quote for washrooms and wet areas. With the A2216 nearby, Dulwich is straightforward for us to reach. Sites close to Dulwich are covered too, including Dulwich Village (1 mile north-west), West Dulwich (1 mile south), Herne Hill (1 mile north-west), Sydenham Hill (1 mile south-east) and Forest Hill (1 mile east). Nearby towns on our patch include London (4 miles north), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles north-west), St Pancras (6 miles north) and Shoreditch (6 miles north).

Landmarks near Dulwich

We work on buildings around The Crown and Greyhound pub, Dulwich Park and Alleyn's School and the streets around them. The nearest railway station is West Dulwich station, about 0.7 miles south-west. A little further out are Dulwich Community Hospital (0.9 miles north) and Greenwich Castle (4 miles north-east). Open spaces near Dulwich include Knight's Hill and Centre for Wildlife Gardening.

Map of Dulwich © OpenStreetMap contributors

After the work

Cleaning and maintenance staff play a part too. Share these points with them:

  • Report split joints at trays and basins early
  • Report faulty extraction promptly
  • Squeegee showers and trays after busy periods
  • Keep a record of which washrooms need attention

Keep extract fans working and vents clear. Constant damp lets mould take hold even on anti-mould grades so report fans that aren’t working to your building services team.

Water getting behind IPS panels and vanity units can swell the boards. Once that happens, a reseal won’t fix them.

Questions we’re asked in Dulwich

Could you schedule work at a campus like King's College London for the vacation?

Yes, holiday working periods are the norm on campus jobs. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.

Can you work in a London building with booked loading and goods-lift slots?

Yes, most London buildings have access rules of some kind, and we plan around them. Share the building’s contractor rules and we’ll work to them.

Do you take on multi-site work?

Yes. Multi-site work and planned programmes are a core part of the service, with each site phased to suit its occupants.

Can the sealant be colour-matched?

That depends on the product. Some ranges offer many colours, others very few, so the available colours are confirmed with the quote.

Will you quote for a small job?

Small jobs are welcome alongside larger packages. Send details for a fixed quote.

How long will the new sealant last?

Nobody can honestly give a figure in years, because life depends on how much the joint moves, how exposed it is and how it’s cleaned and used. Regular checks let you plan resealing before leaks or damage.

What do you charge?

Each job is quoted on its own details. To get one, call 01277 525 020 or send photos by email with a description of the work.

What sets the cost

A fixed quote reflects the actual work. It takes account of:

  • Travel to remote or island sites
  • Which sealant the job calls for
  • Phasing around occupants
  • Removal of failed or old sealant

Access can matter as much as the joints themselves: easy-to-reach joints are quicker than those that need equipment to get to. Tell us how the joints are reached and call for a quote.

Details that help us quote

Diagnosis starts before we arrive. Let us know:

  • When you need the work done
  • Clear photos of the problem areas
  • Approximate linear metres or a joint schedule
  • The type of building and who uses it

The quickest route to a quote is a few photos and the site postcode. Upload them with the quote form, or call 01277 525 020 or email the details over to discuss it first.

Signs you need washroom sealing in Dulwich

Commercial cleaning is harder on sealant than everyday use. Harsh products, abrasive pads and pressure washing break down a joint’s surface and edges, and dirt and mould then get a foothold.

These are often picked up first by site or facilities staff:

  • Open joints at the base of cubicle panels
  • Washrooms that look worn because of the sealant
  • Mould spotting along silicone joints
  • A new bead over an old one coming away

For an occupier at a site such as Goose Green Trading Estate, which lies north of Dulwich, the canteen and welfare facilities need cleanable joints as much as any office.

What your quote should include

  • Health and safety accreditation such as CHAS
  • What the guarantee covers, and for how long
  • Whether their applicators hold CSCS cards
  • How they handle RAMS and site documents

Choosing a commercial sealant contractor

How the job changes by surface

Showers and trays

A tray flexes every time it’s used and is constantly wet. Tray joints are where many washroom leaks start.

Urinals and WC pans

Urinal backs, troughs and slab joints are resealed with sanitary silicone after the old bead and residue are removed.

Diagnose, treat, sign off

Our CSCS-carded applicators arrive with the sealants, primers and backing rod the job calls for. Any old material is cut back to clean, sound faces, primer goes on where the manufacturer specifies it, and the sealant is tooled off neatly. All of Greater London is in the ULEZ, and kerbside space in Dulwich can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.

  1. Every washroom is checked joint by joint, with loose panels, leaks or damp noted for the right trade.
  2. We agree which rooms close and when, so users always have somewhere to go.
  3. Failed silicone is removed completely and the surfaces cleaned of every trace.
  4. Each joint is degreased and left dry, because silicone won’t bond to damp or soapy surfaces.
  5. New sanitary silicone with anti-mould additives goes in and is tooled neat.
  6. You get a reopening time for every room, with signage left up until then.

What we need from you

  • Agree which areas must stay open
  • Tell us what induction or permit system the site runs
  • Make sure the joints can be reached

Getting a fixed quote

Quotes are fixed against the scope you send, so you know the figure before anyone is on site. To start the process, give us a call on 01277 525 020 or send details through our quote form.

Get a price

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