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

Commercial washroom and wet-area sealing in Northwick Park, Greater London

Washroom sealing for Northwick Park, from a contractor working since 2005. Fully insured and CHAS accredited.

  • Complaints from staff, guests or users about tired washrooms
  • Failed joints along IPS and cubicle panels
  • Mould spotting along silicone joints
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
South East, London & Scotland
CHAS & Constructionline
£5m PL insurance

Need washroom sealing in Northwick Park?

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

Keeping Northwick Park washrooms open while we work

The area within 2 miles of Northwick Park 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. Rooms are done in turn so most stay available. London offices and hotels typically can’t close all their washrooms at once, so resealing goes floor by floor, agreed with the facilities team.

Halls of residence and teaching buildings at universities such as Westminster University, under half a mile to the north-east of Northwick Park, are easiest to reseal during vacations. For a site such as Northwick Park Hospital, less than half a mile to the east of Northwick Park, sanitary joints in clinical areas need sound, cleanable sealant and a careful method. If you manage an office at a site such as Harrovian Business Village, 0.8 miles to the west of Northwick Park, the washrooms and tea points can be done a floor at a time.

Northwick Park is about 1 mile south-west of Kenton, in Greater London. We cover commercial sites throughout Northwick Park, for single jobs and planned programmes alike. Our Greater London coverage takes in 764 places, from busy centres to rural villages. For work in that direction, see our London page.

We cover the HA1, HA3 and HA0 postcode districts. Streets here include Lyon Road, Manor Road and Gayton Road. Being close to the A404, Northwick Park is straightforward for us to reach. Nearby places we also cover include Greenhill (1 mile north-west), Harrow on the Hill (1 mile south-west), South Kenton (1 mile east), Kenton (1 mile north-east) and Harrow (1 mile west). Bigger towns within reach include London (11 miles south-east), City of Westminster (9 miles south-east), Marylebone (9 miles south-east), Kensington (7 miles south-east), St Pancras (10 miles east) and Shoreditch (11 miles east).

Landmarks near Northwick Park

Around Northwick Park, our work takes us to commercial buildings near St Anselm's Catholic Primary School, Orley Farm School and Preston Park, among other places. Northwick Park’s nearest station is Kenton station, about 0.6 miles north-east. Nearby you’ll also find Northwick Park Hospital (less than half a mile north-east) and Kodak Museum (1.5 miles north-west). For a walk, there’s Masons Field and Northala Fields.

Map of Northwick Park © OpenStreetMap contributors

Washroom sealing for commercial buildings in Northwick Park

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. Any records you need are confirmed with the quote. Most enquiries involve failed sealant behind washroom basins and split or peeling sealant at shower trays, across IPS panels and cubicles, vanity units and basins and accessible toilets and changing rooms. For commercial sealant work in Northwick Park, you deal with one contact from quote to sign-off, whether it’s one building or several.

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, so staff and visitors can always find an open washroom.

Our workmanship is guaranteed for 12 months. If our installation lets you down in that time, we return and fix it.

Mastic Doctor team members lined up next to their branded vans outside an office building
Location
Northwick Park (HA1, HA3, HA0)
Wider area
Greater London
Cover
A 12-month guarantee
Price
Fixed quote, scope in writing
Call
01277 525 020
Updated
3 November 2026

Quoting for work in Northwick Park

Each job is priced on its own details. The things that drive the figure:

  • Phasing around occupants
  • The product specified
  • Travel to remote or island sites
  • Removal of failed or old sealant

Cost follows what’s involved: removing old material, preparing the joints, the product, the access and how the work is phased. Call for a fixed quote and we will explain how it’s made up.

What we need to price the job

The more we know, the firmer the quote. Helpful details to send:

  • When you need the work done
  • The postcode of the building
  • Access details, including height
  • What the building is and how it’s used

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

After the work

A few simple habits keep the new joints working:

  • Photograph and log failed joints across the estate
  • Keep washrooms out of use until we say the sealant has cured
  • Keep extract fans working and vents clear
  • Avoid scourers and harsh descalers on silicone

Mild cleaning products and non-abrasive cloths look after sanitary silicone best. Aggressive descalers, solvents and scouring pads shorten its life over time.

A split joint at a shower tray can leak for a long time before anyone sees it. At that stage, boards or ceilings may need repair, so reseal when you first spot a split.

From enquiry to sign-off

At the end of each section, the masking comes off, the area is cleaned and every joint is checked with your site contact. Where the sealant needs time to cure before use, we tell you and sign the area. In Northwick Park, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.

  1. Every room is surveyed and the failed joints listed.
  2. You get a fixed quote with the phasing plan.
  3. The whole of the old bead is removed.
  4. Each joint is cleaned and left dry.
  5. New anti-mould sealant goes in and is tooled neat.
  6. Each area is handed back when ready.

What we need from you

  • Warn occupants and staff about the work
  • Flag any permit to work we’ll need
  • Tell us which areas need to stay in use

Quotes

Specifications, drawings and tender packages are welcome with any enquiry, and we will price against exactly what is specified. For smaller jobs, photographs and a description will do.

Ask for a quote

Related advice

Questions we’re asked in Northwick Park

Can you work around term dates at a campus such as Westminster University?

Yes, holiday working periods are the norm on campus jobs. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.

Does a hotel in Northwick Park 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.

Do you need to remove the old sealant?

The failed bead is always removed. New silicone won’t stick to the old, so sealing over it soon peels.

Is any job too small?

Whatever the size, the process is the same: send details, get a fixed quote, we seal, guaranteed.

Can you quote from photographs?

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

Do you phase washroom resealing?

Only the area we are working in is closed. Rooms go back into use once the sealant has cured, then we move on.

Are you CHAS accredited?

Yes. We are CHAS accredited and a Constructionline member.

What we can’t put right

We check first that sealant really is the fix. It won’t put right:

  • Loose panels, vanity units or tiles, which need fixing first
  • Failed tanking beneath a wet-room floor or behind tiles
  • Water from plumbing, not from a joint

If in doubt, ring 01277 525 020 or send details through our quote form and we will say what we think.

Where we work in Northwick Park

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

Surface by surface

Urinals and WC pans

Joints around urinals and WC pans take splashes, cleaning chemicals and knocks. Once they discolour or split, they hold odours and look unhygienic.

IPS and cubicle panels

Panel systems meet walls, floors and vanity tops at sealed joints. They stop water reaching the panel boards.

Work for main contractors and building owners

We work for building owners and managing agents on everything from one building to a spread of sites around Northwick Park. One quote can cover more than one site, which keeps the paperwork simple.

As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. We are fully insured, and our insurance certificate can go with the quote.

Accreditations

Trusted. Accredited. Insured.