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

Commercial washroom and wet-area sealing in Charlton, Greater London

Sealing in commercial washrooms, showers, kitchens and wet areas in Charlton. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.

  • Split or peeling sealant at shower trays
  • Stained sealant around pans and urinals
  • Sealant stained black around basins and showers
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
South East, London & Scotland
Constructionline member
£5m PL insurance

Washroom sealing near Charlton

Photos, a specification or a quick description of the joints is enough to start a fixed quote.

From enquiry to sign-off

When we get to site, we report to your site contact and complete whatever induction the building runs. Floors, finishes and fittings next to the joints are covered before anything is cut or cleaned, and the work usually takes a morning or so for a small washroom, longer where showers and changing rooms are included. Most London premises stay occupied while we are on site, so zones and timings are agreed with whoever manages the building. Areas are handed back as each section is finished.

  1. We agree which washrooms close and when.
  2. Leaks, loose panels or damp are pointed out first.
  3. Old sealant is stripped and the faces prepared.
  4. We reseal with the grade suited to each area.
  5. We confirm reopening times for each washroom.

What we need from you

  • Move anything stored against the joints
  • Point out parking and an unloading spot
  • For older buildings, check the asbestos register before work

Ask for a quote

Every quote starts with the facts: the joints involved, quantities, access and the product called for. Send what you have, and we’ll arrange a site visit if anything is unclear.

Ask for a quote

Related advice

About our washroom sealing in Charlton

Since 2005 we have resealed commercial washrooms for facilities teams, contractors and building owners. Our applicators are CSCS-carded, and we are CHAS accredited and a Constructionline member. There is public liability insurance behind every job. Every resealed washroom carries our 12-month guarantee. We work on showers, trays and wet room floors, vanity units and basins and accessible toilets and changing rooms, and the failures we are asked to look at most are kitchen worktop joints that can’t be kept clean and sealant laid over old silicone and now peeling. Most enquiries from Charlton start with one failed joint and grow into a wider look at the building: we look at the rest while we are there and tell you what we find.

In Charlton, 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.

Every job we finish is backed by a 12-month workmanship guarantee, wherever the site is. If a joint we sealed fails because of how it was installed, we come back and put it right.

Place
Charlton (SE7, SE18)
Region
Greater London
Cover
12 months on every job
Quote
A fixed quote before we start
Telephone
01277 525 020
Last updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

Surface by surface

IPS and cubicle panels

IPS panels and cubicle systems have joints at the wall, the floor and the worktop. Those joints protect the boards behind from water.

Healthcare and care settings

We phase washroom sealing so care areas are never left without facilities. Tell us what records you need and we will confirm with the quote.

When to call us in Charlton

Decorators’ caulk and general sealants sometimes end up where sanitary silicone belongs. They don’t stand up to constant water and they discolour and fail early.

If one of these sounds familiar, it’s time for a closer look:

  • Gaps where vanity tops meet the wall
  • Resealing that didn’t last because the old bead stayed
  • Failed joints along IPS and cubicle panels
  • Sealant stained black around basins and showers

Toilets at colleges like Shooters Hill Sixth Form College, 1.4 miles to the south-east of Charlton, take heavy use from students and staff alike.

Questions to ask before you book

  • Whether old or failed sealant will be cut out, not overlaid
  • How they handle RAMS and site documents
  • How they’ll work around occupants
  • Their pre-qualification and accreditations

Our contractor checklist

General trades versus a specialist

For most general trades, sealant is a sideline. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint, which is what makes a joint last.

The visible bead is only part of the job. Correct depth, the right primer and a sealant matched to the movement are easy to get wrong without experience.

Aftercare for building managers

Keep the joints in good shape with a few simple steps:

  • Act on the first split you see at a shower tray
  • Keep extract fans working and vents clear
  • Inspect washroom sealant regularly
  • Note failing joints building by building

Add washroom sealant to routine inspections. Look for black spotting, cracks, peeling edges and gaps at the busiest fittings and photograph anything new.

In food areas, cleanability is something environmental health officers look at. Failed sealant around sinks and worktops is easy to put right in good time.

Cost factors for washrooms and wet areas

Quotes vary with the job. It mainly depends on:

  • Induction, permit and paperwork requirements
  • How much existing material needs removing
  • Phasing around occupants
  • How much there is to seal

Access often affects the price as much as the sealing: 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

There’s no need for a formal survey. These details are enough to start:

  • Anything awkward about access or site hours
  • Asbestos survey details if the building is older
  • The type of building and who uses it
  • Photos of the joints, close up and from further back

The quickest route to a quote is a few photographs and the site postcode. Send them through the quote form, or speak to us on 01277 525 020 or use the quote form if you’d rather talk the job through.

Your questions answered

Will our hotel in Charlton need to close for the work?

Rarely, if ever. We take a few rooms out at a time. Housekeeping and our team agree each day’s rooms.

Could you schedule work at a campus like Ravensbourne University London for the vacation?

Yes. Tell us the term dates, vacation periods and access windows, and we’ll plan the work around them. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.

Do you have public liability insurance?

Yes. We’re fully insured, including public liability cover.

What do you charge?

It depends on the job: quantities, access, the product and any phasing. Call for a quote and we’ll price it properly.

Is old silicone taken out first?

We always remove it. Fresh silicone can’t key to an old bead, so sealing over it soon peels.

Is colour matching possible?

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

How long before the toilets can reopen?

The silicone needs time to cure before water reaches it. We plan the phasing around that so there are always rooms open.

Toilets, showers and kitchens around Charlton

The area within 2 miles of Charlton holds a good number of hotels. Behind every hotel door there’s a bathroom whose sealant will need renewing sooner or later. Rooms are done in turn so most stay available. In London buildings, toilets and showers generally need to stay partly open, which is why the work is split into phases agreed in advance.

On a healthcare site such as Queen Elizabeth Hospital, 0.8 miles south-east of Charlton, washroom work starts with the infection-control team’s sign-off. Halls of residence and teaching buildings at universities such as Ravensbourne University London, 1.7 miles to the north-west of Charlton, are easiest to reseal during vacations.

Charlton is about 2 miles west of Plumstead, in Greater London. Our applicators travel to Charlton for work on washrooms and wet areas, handled exactly as we handle every other area. Charlton is one of 764 places in Greater London on our list for washrooms and wet areas. We also cover London, around 6 miles from Charlton.

We cover the SE7 and SE18 postcode districts. Among the streets we cover are Floyd Road, Guild Road and Priolo Road, and sites on any of them can send details for a fixed quote. If your building is just outside Charlton, we cover New Charlton (1 mile north-west), Westcombe Park (1 mile west), Woolwich (1 mile east), Vanbrugh Park Estate (1 mile south-west) and Kidbrooke (2 miles south). Nearby towns on our patch include London (6 miles west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (7 miles west) and Shoreditch (6 miles north-west).

Local landmarks in Charlton

We work on buildings around Charlton Park, Wildwood Montessori School and Royal Greenwich Trust School. There’s a railway station in Charlton itself: Charlton station. Other landmarks nearby include British Hospital for Mothers and Babies (0.5 miles east) and Gallions Reach Shopping Park (2.3 miles north-east). Open spaces near Charlton include Gilbert's Pit.

Map of Charlton © OpenStreetMap contributors
Accreditations

Trusted. Accredited. Insured.