Commercial washroom and wet-area sealing in Knowle, Hampshire
Looking for washroom sealing in Knowle? Send us the details for a fixed quote, backed by a 12-month guarantee on the work.
- Stained sealant around pans and urinals
- Panel joints letting water behind
- Users noticing mouldy joints
Washroom sealing in Knowle
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
About our washroom sealing in Knowle
Our washroom work covers offices, hotels, schools and colleges, leisure centres and gyms, clinics and care homes, plus the kitchens and tea points that go with them. Product and method follow how hard each area is used and cleaned. We work on accessible toilets and changing rooms, IPS panels and cubicles and vanity units and basins, and the failures we’re asked to look at most are black mould inside silicone joints that cleaning can’t shift and sealant laid over old silicone and now peeling. Whoever orders the work in Knowle, the brief is typically the same: a clear scope, tidy work and joints that don’t fail again.
Farm shops, cafés and venues in converted rural buildings around places like Knowle have busy toilets and kitchens. We plan the work around bookings and opening times.
We sign every job off with a 12-month guarantee. The promise is simple: if the work we did fails within twelve months, we return to fix it.
- Location
- Knowle (PO17)
- Region
- Hampshire
- Guarantee
- 12 months on every job
- Price
- Quoted before any work starts
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
When something else is needed
A few problems need another trade or a different fix, and we say so rather than covering them up:
- A room that stays damp because ventilation isn’t working
- Fittings that move too much to hold a bead
- Panel boards already damaged by water
Not sure which it is? You can call 01277 525 020 or send photos by email and we will tell you honestly.
Where we work in Knowle
- Vanity units and basins
- Kitchens and tea points
- Accessible toilets and changing rooms
- Showers, trays and wet room floors
- Urinals and WCs
- IPS panels and cubicles
Our process
Our CSCS-carded applicators arrive with the sealants, primers and backing rod the job calls for. Joint faces are cleaned back to sound, dry surfaces, the manufacturer’s primer is applied where it’s called for, and each bead is tooled to a neat concave finish. Smaller jobs around Knowle can be grouped with others nearby. A fixed quote is given before anything starts.
- We start by inspecting the fittings and joints and flagging problems sealant can’t solve.
- We agree which rooms close and when, so users always have somewhere to go.
- Failed silicone is removed completely and the surfaces cleaned of every trace.
- We clean and dry every surface so the new sealant can grip.
- New sanitary silicone with anti-mould additives goes in and is tooled neat.
- Each room is handed back once the sealant has had its cure time.
What we need from you
- Point out parking and an unloading spot
- Point out any areas we must not close
- Share your working hours and any access restrictions
Getting a fixed quote
Send details, get a quote, we seal, guaranteed: that’s how every job runs. To take the first step, ring 01277 525 020 or email the details over.
Read more
Looking after the joints
After handover, a little attention goes a long way:
- Clean sealant with gentle products and a soft cloth
- Tell us about infection-control or permit rules before we quote
- Leave signs up until the cure time is over
- Keep a record of which washrooms need attention
Ventilation is half the battle. A room that stays damp will grow mould on almost anything 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. At that stage, boards or ceilings may need repair, so reseal when you first spot a split.
Why it’s worth doing now in Knowle
A tired-looking washroom doesn’t always need a refurbishment. If the finishes are in good order, replacing the sealant may do much of what’s needed while bigger works are planned. One visit to deal with every failing joint makes more sense than several trips to a place like Knowle, rather than one at a time. Photos of every joint help us quote for the whole job.
Quantities, awkward access and phased working all shape the price. So do site requirements such as inductions and permits.
Why us?
- One phone line for London, the South East and Scotland
- Specification-led, product-correct work
- Clear, fixed quotes
- Coloured sealants to suit the setting, where available
Read how commercial sealant jobs are priced and how we’re accredited.
Cost factors for washrooms and wet areas
What shapes the price:
- Distance, for remote addresses
- Any access equipment needed
- Phasing around occupants
- Site requirements such as inductions and permits
The product called for affects the cost, as does the preparation each joint needs, from cutting out to priming and backing rod. Access, phasing and site rules also count.
What to include in your enquiry
The more we know, the firmer the quote. Helpful details to send:
- Specification clauses that apply
- Your programme or deadline
- A wide shot and a close-up of the area
- How the joints are reached, and at what height
A handful of photographs and a postcode is the fastest way to a quote. Upload them with the quote form, or give us a call on 01277 525 020 or email drawings and photos if you’d rather talk the job through.
Your questions answered
Will our hotel in Knowle need to close for the work?
Almost never. The work is phased so most rooms stay available. The plan is built around your bookings.
Do you take on work at healthcare sites like Knowle Hospital?
Yes, hospitals are one of the sectors we cover. Work is phased so departments keep running, under the site’s own rules.
Do you have public liability insurance?
Yes. Mastic Doctor is fully insured, public liability included.
Do you need to remove the old sealant?
We strip every bit of the failed bead and wipe away the residue before resealing. That’s what makes the new joint last.
Is any job too small?
We quote for single jobs as well as large packages and programmes. Photos and a description are enough to start.
Can one quote cover more than one building?
Yes. Several buildings can share a single quote, and you deal with one contact throughout.
Can you send site paperwork?
Let us know which documents the site needs, such as RAMS, an insurance certificate or CSCS details, and we will confirm them with the quote.
Places near Knowle
Other services in Knowle
Toilets, showers and kitchens around Knowle
Central London is about 64 miles from Knowle. Washrooms in commuter-belt offices take constant weekday traffic, which is why the work is phased. There are a number of hotels within about 2 miles of Knowle. Behind every hotel door there’s a bathroom whose sealant will need renewing sooner or later. We work a handful of rooms at a time, so the hotel keeps letting the rest.
Office washrooms on sites such as Knowle Village Business Park (to the north-west of Knowle) are in use all working day, so resealing is phased to keep some open. Customer toilets in retail centres such as Broadcut Retail Park (to the south-east of Knowle) rarely close, so resealing is phased.
Knowle is about 2 miles north of Fareham, in Hampshire. Any commercial site in Knowle is covered, for single jobs and planned programmes alike. Across Hampshire, 723 places are covered, Knowle among them. Sites around Portsmouth have their own page, about 7 miles away.
We cover the PO17 postcode districts for washrooms and wet areas. We cover commercial and managed buildings on Serotine Close, Boundary Walk and Park Approach. If your building is just outside Knowle, we cover Funtley (1 mile south), Tapnage (1 mile north-west), Heathfield (2 miles south), Segensworth (2 miles west) and Titchfield Park (2 miles south-west). Nearby towns on our patch include Winchester (13 miles north), Gosport (6 miles south-east), Havant (10 miles east), Eastleigh (9 miles north-west), Horndean (9 miles east) and Totton (13 miles west).
What’s near Knowle
Recent enquiries here include premises near The Miners Arms and The Henry Cort Community College and the streets around them. For rail, the closest station is Fareham station, roughly 2 miles south of the centre. Other landmarks nearby include Portchester Castle (4.9 miles south-east) and Knowle Hospital (under half a mile north-east). Not far away are Portsdown Hill and Swanwick Lakes.
What we are called out for in Knowle
Mop buckets, trolleys and knocks from users damage joints near the floor, especially at floor edges and around urinals and WC pans.
Clients usually get in touch after noticing one or more of the following:
- Failed sealant behind washroom basins
- Failed joints along IPS and cubicle panels
- Washrooms that look worn because of the sealant
- Black mould inside silicone joints that cleaning can’t shift
Hotels such as The King's Head Hotel, 1.5 miles north-east of Knowle, have en suite bathrooms where tired silicone at the bath, tray and basin is replaced room by room.
Before you book anyone
- Will CSCS-carded applicators be on site?
- How the joint faces will be prepared and primed
- Health and safety accreditation such as CHAS
- Their approach to joint depth and backing