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

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

Commercial sealant work in Lee for contractors, FMs and building owners: sealing in commercial washrooms, showers, kitchens and wet areas, with a fixed quote first.

  • Shower tray joints that have opened up
  • Resealing that didn’t last because the old bead stayed
  • Panel joints letting water behind
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Signed off, with 12 months’ guarantee.
London, the South East & Scotland
CHAS accredited
£5m public liability

Washroom sealing in Lee

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

Washroom sealing in Lee

Not every silicone belongs in a washroom. Sanitary silicone contains additives that resist mould, and neutral-cure types are used where acetoxy silicone could attack some metals, stone or mirror backings. Where food contact is possible, we use a hygienic, food-safe grade. If you have sealant laid over old silicone and now peeling and sealant lifting along a tray edge, we can help. A specialist sealant contractor works differently from a general builder: on jobs in Lee, preparation and product choice get the time they need.

Washrooms in London offices, hotels and gyms are used hard from morning to evening. Mouldy or split sealant at vanity tops, IPS panels and urinals is replaced with anti-mould sanitary silicone, in phases so some facilities stay open.

Every job is signed off with a 12-month guarantee. It’s a plain promise: if the work we did fails within twelve months, we return to fix it.

Location
Lee (SE12, SE13, SE3)
Region
Greater London
Cover
12 months on our workmanship
Quote
Fixed quote, scope in writing
Telephone
01277 525 020
Last updated
3 November 2026
The Mastic Doctor team standing beside their branded vans outside an office building

Lee: questions and answers

Can you work around term dates at a campus such as University of Greenwich - Greenwich Campus?

Yes. Tell us the term dates, vacation periods and access windows, and we will 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.

Can you take on a job at a hospital such as Blackheath Hospital?

Yes. We work in healthcare settings as well as offices and schools. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.

When is resealing likely to be due?

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 inspection is the best way to catch problems early.

Will cleaning remove black mould from sealant?

Cleaning may lighten it, but the mould returns. New anti-mould sanitary silicone is the treatment and point out if ventilation is part of the problem.

How long does a job like this take?

We plan the time on site around your programme and access. You’ll have an expected duration with the quote.

Can you quote from photos?

Many jobs can be quoted from photographs, drawings or a joint schedule. Where they aren’t, we arrange a site visit.

Do you work in hospitals, clinics and care homes?

Yes. Your infection-control rules, estates requirements and permits are followed. The work is phased around patients or residents.

General trades versus a specialist

For a quick touch-up, site staff may be fine, but larger jobs are different: a specialist brings efficiency, a consistent finish and a 12-month guarantee.

Redoing a failed joint usually costs more than getting it right at the outset, because the whole bead must be removed and the faces cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.

Maintenance after handover

To get the most from the new sealant:

  • Act on the first split you see at a shower tray
  • Respect the cure time before reopening each room
  • Inspect washroom sealant regularly
  • Clear standing water from shower floors where possible

Ventilation is half the battle. Constant damp lets mould take hold even on anti-mould grades so report fans that aren’t working to your building services team.

Leaks through tray and wet-floor joints can go unseen until a ceiling marks below. By then, other trades may be needed as well, so reseal when you first spot a split.

Washroom sealing in Lee: the local picture

The area within 2 miles of Lee holds a good number of hotels. 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.

For a site such as Blackheath Hospital, which lies north of Lee, sanitary joints in clinical areas need sound, cleanable sealant and a careful method. Welfare facilities in units on estates such as Chiltonian Industrial Estate, less than half a mile to the south of Lee, have showers, toilets and kitchens with sealant that works hard.

Lee is about 2 miles south of Greenwich, in Greater London. Our applicators travel to Lee for work on washrooms and wet areas, handled exactly as we handle every other area. 764 places across Greater London fall within our area, Lee among them. There’s a separate page for London, roughly 6 miles from Lee.

We cover the SE12, SE13 and SE3 postcode districts for washrooms and wet areas. We cover commercial and managed buildings on Old Road, Manor Lane and Mallet Road and the roads nearby. Close to Lee, our area also takes in Hither Green (1 mile west), Horn Park (1 mile south-east), Lewisham (1 mile north-west), Ladywell (1 mile west) and Blackheath (1 mile north). Nearby towns on our patch include London (6 miles north-west), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (10 miles west), St Pancras (7 miles north-west) and Shoreditch (6 miles north-west).

Local landmarks in Lee

In Lee, that means premises near Manor House Gardens, Trinity Church of England School and International Academy of Greenwich. Lee has its own railway station: Lee station. Other landmarks nearby include Lewisham Shopping Centre (1.1 miles north-west) and Prefab Museum (1.3 miles south). The countryside around Lee includes Summer Hill and Birdbrook Road Nature Reserve.

Map of Lee © OpenStreetMap contributors

Our process

Diagnose, treat, sign off: that’s the shape of every visit. First comes an inspection and agreement on scope, then we prepare and seal each joint with the specified product, and the job ends with a walk round and sign-off. In Lee, most buildings stay in use during the work, 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. Failed sealant and residue are stripped out.
  4. We reseal with the grade suited to each area.
  5. We confirm reopening times for each washroom.

Before we start on site

  • Share your working hours and any access restrictions
  • Tell us what induction or permit system the site runs
  • Point out parking and an unloading spot

Quotes

Photos, drawings or a schedule of the joints are often enough for a fixed quote. Where a site visit makes more sense, we’ll arrange one.

Ask for a quote

Advice

Why it’s worth doing now in Lee

A tired washroom says a lot about how a building is run. Guests, clients, pupils and patients notice stained joints even when the room is otherwise spotless. Resealing is a modest task with a very visible payoff. Repeat call-outs disrupt occupied London buildings, so a proper job first time, with the old sealant fully removed, is worth it.

A quote for washrooms and wet areas depends on quantities, condition and access, plus any specification you’re working to. Ask us for a fixed quote.

Why appoint us

  • Standard and matched colours in many product ranges
  • Our applicators hold CSCS cards
  • Products installed to the manufacturer’s instructions
  • 12 months’ guarantee on every job

Take a look at what affects the cost and our accreditations and insurance.

What sealant work can’t fix

Sealant solves a lot, but not everything, and we’d rather tell you before you spend money. It won’t fix:

  • Hollow tiles or loose panels behind the joint
  • Panel boards already damaged by water
  • Leaks through tanking or membranes below the finishes

Not sure which it is? You can phone 01277 525 020 or send details through our quote form and we’ll tell you honestly before you book.

Joints and surfaces we work on

  • Kitchens and tea points
  • Vanity units and basins
  • Accessible toilets and changing rooms
  • IPS panels and cubicles
  • Urinals and WCs
  • Showers, trays and wet room floors

Signs you need washroom sealing in Lee

Cubicle panels, IPS panels and vanity units flex when people lean on them or doors are slammed and trays shift slightly with each user. If the joint wasn’t laid to take that movement, it tears or peels away.

Look out for the following:

  • Gaps where vanity tops meet the wall
  • Black mould inside silicone joints that cleaning can’t shift
  • Split or peeling sealant at shower trays
  • Stained or open joints at kitchen sinks and worktops

Halls of residence and teaching buildings at universities such as University of Greenwich - Greenwich Campus, 2.2 miles north of Lee, are easiest to reseal during vacations.

Questions to ask before you book

  • Their approach to joint depth and backing
  • What site paperwork they can supply
  • How the joint faces will be prepared and primed
  • Whether their applicators hold CSCS cards

Questions to ask before you appoint anyone

Accreditations

Trusted. Accredited. Insured.