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

Washroom Sealing contractors in Sevenoaks

Planning work on a washroom in Sevenoaks? We look at it, seal it with the right product and hand it over with a 12-month guarantee.

  • Complaints from staff, guests or users about tired washrooms
  • Shower tray joints that have opened up
  • Open joints at the base of cubicle panels
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
One fixed quote covering the agreed scope.
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
Constructionline member
Fully insured: £5m PL

Need washroom sealing in Sevenoaks?

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

FAQs: Sevenoaks

Can you work on a hospital site such as Sevenoaks Hospital?

Yes, healthcare and care buildings are part of our work. We follow the site’s permits, sign-in and infection-control procedures in every area.

Will the toilets in our Sevenoaks building be out of use?

Rarely all at once: work is phased so some facilities are always available. Each area is handed back once the sealant has cured enough to use.

Which silicone is right for commercial washrooms?

Sanitary silicone with anti-mould additives for most washroom joints. We use neutral-cure versions on stone, some metals and near mirrors.

Will all the toilets be closed at once?

Just the room being resealed is out of use. Each room reopens after the sealant’s cure time, then we move on.

Are you fully insured?

Yes. Our insurance certificate can be sent alongside the quote.

How long does a typical visit take?

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

How soon can a washroom be used after resealing?

Each sealant has a cure time before it should get wet. We plan the phasing around that so there are always rooms open.

Washroom sealing in Sevenoaks, done properly

In healthcare and care settings, sealing is part of keeping surfaces cleanable. We work to your organisation’s estates and infection-control requirements and any site permits. Tell us what records you need and we’ll confirm with the quote. Most enquiries involve washrooms that look worn because of the sealant and resealing that didn’t last because the old bead stayed, on IPS panels and cubicles, showers, trays and wet room floors and vanity units and basins. Looking for mastic applicators who cover Sevenoaks? Mastic Doctor has worked for contractors, FMs and building owners since 2005, CHAS accredited and a Constructionline member.

Towns the size of Sevenoaks have washrooms and wet areas in schools, care homes, offices, gyms and restaurants. Anti-mould sanitary silicone, laid on clean, dry joints, keeps them looking cared for and easy to clean.

Every job is signed off with a 12-month guarantee. It’s a plain promise: if our work fails within that year, we put it right.

Location
Sevenoaks (TN13, TN14, TN15, TN8)
Region
Kent
Guarantee
12 months on our workmanship
Quotes
A fixed quote before we start
Phone
01277 525 020
Last updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

Wet areas in Sevenoaks’s workplaces

A 2-mile radius around Sevenoaks takes in a number of hotels. Each has en suites, back-of-house toilets and kitchens with sealant that moulds and splits. Rooms are done in turn so most stay available. Sevenoaks is about 19 miles from central London. Business park offices have washrooms in daily use by staff, which is why the work is phased.

For a hotel such as The Royal Oak Hotel (1.1 miles south of Sevenoaks), resealing en suites a few rooms at a time keeps the rest available. For a school such as Sevenoaks Primary School, washroom and kitchen sealant can be renewed around term dates.

Sevenoaks is about 19 miles south-east of London, in Kent. Across the TN13 postcode area, it works the same way: details in, fixed quote out, then sealing and a 12-month guarantee. Sevenoaks is one of 931 places we cover in Kent. London is covered too, some 19 miles away.

Commercial sites across TN13, TN14, TN15 and TN8 are covered. Buildings on London Road, High Street and Church Road are within our area. Main routes into Sevenoaks include the A21 and A25, which helps when planning parking and deliveries for the job. Sites close to Sevenoaks are covered too, including Riverhead (1 mile west), Kippington (1 mile south), Dunton Green (1 mile north-west), Bessels Green (1 mile west) and Chipstead (2 miles west). Bigger towns within reach include Maidstone (15 miles east), Dartford (11 miles north), Royal Tunbridge Wells (11 miles south), Gravesend (13 miles north-east), Tonbridge (7 miles south-east) and Northfleet (13 miles north-east). As one of the bigger centres in Kent, Sevenoaks has a broad mix of commercial, public and industrial buildings.

What’s near Sevenoaks

Around Sevenoaks, our work takes us to commercial buildings near The Rifleman pub, New Beacon School and Knole Academy, among other places. There’s a railway station in Sevenoaks itself: Sevenoaks station. Well-known places in the area include Sevenoaks Hospital (0.6 miles north-east) and Kemsing Castle Bank (2.6 miles north-east). Not far away are Dryhill Nature Reserve.

Map of Sevenoaks © OpenStreetMap contributors

After the work

Sealant joints are maintenance items, and their life depends on movement, exposure, cleaning and use. Our advice:

  • Mention any site permits or estates rules at quote stage
  • Note failing joints building by building
  • Report split joints at trays and basins early
  • Don’t leave trays and floors sitting wet

Keep extract fans working and vents clear. A room that stays damp will grow mould on almost anything so report fans that aren’t working to your building services team.

Mouldy sealant only gets harder to ignore, and complaints follow. Replacing it early keeps the job to a reseal.

Work for main contractors and building owners

Building owners and managing agents use us on sealant work across single buildings or whole portfolios around Sevenoaks. One quote can cover more than one site, which keeps the paperwork simple.

Whether you are a managing agent, a property factor or an owner’s representative: send the details, accept a fixed quote, and we carry out and guarantee the work. We can agree access arrangements and keyholder contacts beforehand.

Different surfaces, different methods

Wet-room floors and floor-to-wall joints

Wet floors are common in accessible showers and changing rooms so the edges are checked carefully.

Showers and trays

In staff, hotel and changing-room showers, the tray joint and wall corners take the hardest use. Each bead is stripped, the joint dried and new sealant laid.

How a job runs

A typical day starts with protection: masking tape along the joint edges and sheeting over anything nearby. On site, the work normally takes a morning or so for a small washroom, longer where showers and changing rooms are included, and we clear our waste as we work. Parking and loading for town-centre jobs in Sevenoaks are worth mentioning when you send details. Industrial and business units typically have yard or car park space.

  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. 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

  • Arrange parking or a loading space
  • Send any specification or drawings in advance
  • Tell staff and tenants when we’ll be in

Quotes

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

Get a price

Advice

What sets the cost

To price the job, we consider:

  • How much there is to seal
  • Travel to remote or island sites
  • Backing rod, priming and other preparation
  • Access and working height

Access can matter as much as the joints themselves: easy-to-reach joints are quicker than those that need equipment to get to. Mention the access as part of your enquiry.

Before you send an enquiry

Whether it’s one area or a whole building, the same details help:

  • Any dates the work must fit around
  • Specification clauses that apply
  • Anything awkward about access or site hours
  • The asbestos register, for older buildings

Let us know the site, the scope and your timescale, and we will put a fixed quote together. To get it moving, phone 01277 525 020 or email drawings and photos.

What we are called out for in Sevenoaks

Panels and vanity units move slightly in use and trays shift slightly with each user. A bead that can’t cope with the movement splits along one edge.

Any of the following is a good reason to get the joints checked over:

  • Washrooms that look worn because of the sealant
  • Urinal joints that look unhygienic
  • Failed joints along IPS and cubicle panels
  • Split or peeling sealant at shower trays

Where you’re responsible for a hall attached to a building such as St John the Baptist, its kitchen and toilets need sealant that stays cleanable.

What your quote should include

  • Their plan for phasing and protecting the area
  • What level of public liability insurance do they hold?
  • Are they CHAS accredited or on Constructionline?
  • What the guarantee covers, and for how long

Our contractor checklist

Accreditations

Trusted. Accredited. Insured.