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

Washroom Sealing contractors in Penge

Work needed on a washroom in Penge? We look at it, seal it with the right product and hand it over with a 12-month guarantee.

  • Mould spotting along silicone joints
  • Open joints at the base of cubicle panels
  • Shower tray joints that have opened up
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
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
South East, London & Scotland
CHAS accredited
£5m PL insurance

Washroom sealing across Penge

Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.

Diagnose, treat, sign off

Inspect, seal, sign off: that’s the shape of every visit. We inspect the joints and confirm what’s in scope, then the work is carried out to the specified product and detail, and the job ends with a walk round and sign-off. Planning a London job such as one in Penge starts with access: booked loading, goods lifts, the building’s permit system and a spot to keep materials. Send the building rules and access times with your enquiry.

  1. Every washroom is checked joint by joint, with loose panels, leaks or damp noted for the right trade.
  2. The phasing is agreed so there are always facilities open.
  3. The failed silicone is stripped and every face scraped clean of residue.
  4. Each joint is degreased and left dry, because silicone won’t bond to damp or soapy surfaces.
  5. We lay a sanitary silicone bead and tool it smooth so it is easy to clean.
  6. Rooms reopen after the product’s cure time, and we move to the next.

Getting the site ready

  • Warn occupants and staff about the work
  • Arrange parking or a loading space
  • Flag any permit to work we’ll need

Quotes

Every job follows the same four steps: send details, get a quote, we seal, guaranteed. To take the first step, phone 01277 525 020 or email a schedule or drawings.

Get a price

Advice

Washroom sealing in Penge

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. Only replacement gets rid of it for good. Most enquiries involve stained sealant around pans and urinals and gaps where vanity tops meet the wall, across urinals and WCs, showers, trays and wet room floors and vanity units and basins. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: in Penge, that means joint design, primers and backing rod as standard.

Many London buildings can’t close every toilet at once. We work through washrooms floor by floor or core by core, at times agreed with you.

A 12-month guarantee applies to all our work. If an installation problem shows up, phone 01277 525 020 or email us and we will arrange a return visit.

The Mastic Doctor team standing beside their branded vans outside an office building
Where
Penge (SE20, SE19, SE26)
Region
Greater London
Guarantee
12 months on our workmanship
Quotes
Fixed quote, scope in writing
Phone
01277 525 020
Updated
3 November 2026

Commercial clients in Penge

Housing associations and managing agents often need work done across blocks and communal areas. Work can be phased so residents and staff keep access throughout, with each stage agreed with your site contact.

As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.

Site staff or a sealant specialist?

The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are where general trades tend to cut corners.

Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.

Washroom sealing in Penge: the local picture

A London building with hundreds of occupants can’t lose every washroom for a day, so we take one block of facilities out of use at a time. Several hotels sit less than 2 miles from Penge. Each has en suites, back-of-house toilets and kitchens with sealant that moulds and splits. The work can go floor by floor, agreed with housekeeping.

On an industrial estate such as Franklin Industrial Estate, under half a mile south-east of Penge, staff toilets, showers and canteens are where sanitary sealant takes the most wear. At a university such as King's College London, 3.9 miles north of Penge, summer is the usual window for resealing residence bathrooms. Staff changing rooms and patient toilets at places like British Home & Hospital for Incurables, 2.1 miles to the west of Penge, need cleanable, sound silicone.

Penge is about 1 mile west of Beckenham, in Greater London. Businesses, contractors and managing agents in Penge use us for work on washrooms and wet areas. Penge is one of 764 places in Greater London on our list. There’s a separate page for London, about 6 miles away.

Postcode districts covered here: SE20, SE19 and SE26. If your site is on High Street, Anerley Station Road and Station Road or close by, we can quote for washrooms and wet areas. Being close to the A234, Penge is easy to get to with materials and equipment. Close to Penge, our area also takes in Anerley (1 mile west), Crystal Palace (1 mile north-west), Sydenham (1 mile north), Gipsy Hill (1 mile north-west) and Upper Norwood (1 mile west). Further afield, our area takes in London (6 miles north), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (8 miles north-west), St Pancras (8 miles north) and Shoreditch (8 miles north).

Around Penge

We work on buildings around Crystal Palace School, Crooked Billet pub and Crystal Palace Dinosaurs. Penge has its own railway station: Penge West station. A little further out are St Christopher's Hospice (0.5 miles north) and Crystal Palace Museum (0.8 miles north-west). For a walk, there’s Dulwich Upper Wood and Knight's Hill.

Map of Penge © OpenStreetMap contributors

Surface by surface

Healthcare and care settings

In healthcare, sealed joints are part of infection control. We work to your estates and infection-control requirements as well as site permits.

Urinals and WC pans

Urinal backs, troughs and slab joints are resealed with sanitary silicone once the whole of the old bead has gone.

How the quote is worked out

These are the things that shape the price:

  • Whether old sealant has to be cut out first
  • Any access equipment needed
  • Specialist products, such as fire-rated or hygienic sealants
  • Whether the work must be split into stages

Quantities, awkward access and phased working all shape the price. So do site requirements such as inductions and permits.

What we need to price the job

Diagnosis starts before we arrive. Let us know:

  • Photos of the joints, close up and from further back
  • Whether the building will be occupied during the work
  • Anything awkward about access or site hours
  • Specification clauses that apply

Every quote starts with the facts: what’s there, how much of it, how we reach it and what’s specified. Send what you have, and we will arrange a site visit if anything is unclear.

After the work

Every sealant joint needs some looking after, and how long they last depends on how they’re treated. We suggest:

  • Squeegee showers and trays after busy periods
  • Include joints in routine washroom inspections
  • Share your site rules when you send details
  • Leave signs up until the cure time is over

Squeegeeing showers and trays after heavy use helps. Standing water on a joint all day shortens its life.

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.

Common questions from Penge clients

Will you work in a care home in Penge without moving residents out?

Yes. We agree rooms and times with the manager and work a few areas at a time. Noise and disruption are kept to a minimum.

Does a hotel in Penge need to shut while its sealant is renewed?

Rarely. Rooms or floors are done in turn, so the rest of the hotel keeps trading. We agree the order of rooms and the timings with you before we start.

Can you reseal washrooms in healthcare buildings?

Yes. We work to your estates and infection-control requirements and any site permits, and phase the work so areas keep facilities.

Are your applicators CSCS-carded?

Yes. If you need card details for site access, tell us and we will confirm them with the quote.

Do you offer coloured sealant?

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

How long does a typical visit take?

The duration is planned around your programme and the access we are given. You will have an expected duration with the quote.

What if there’s asbestos in the old mastic?

Asbestos is possible in some older mastics, particularly in buildings from before 2000. We check the asbestos register before cutting out old sealant in an older building, and if asbestos is suspected, work stops until it’s tested. We don’t remove asbestos-containing materials.

Accreditations

Trusted. Accredited. Insured.