Washroom Sealing contractors in Old Knebworth
Sealing in commercial washrooms, showers, kitchens and wet areas in Old Knebworth and across Hertfordshire. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- A new bead over an old one coming away
- Sealant stained black around basins and showers
- Washrooms that look worn because of the sealant
Washroom sealing for businesses in Old Knebworth
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 Old Knebworth
We reseal washrooms and wet areas in offices, hotels, schools, universities, gyms, healthcare buildings and care homes, along with staff kitchens and tea points. The products and the method are chosen for how heavily each space is used. We work on IPS panels and cubicles, showers, trays and wet room floors and urinals and WCs, and the failures we are asked to look at most are sealant laid over old silicone and now peeling and failed joints along IPS and cubicle panels. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, the work in Old Knebworth is the same: failed joints cut out, faces prepared and the right sealant laid to the right depth.
Smaller places such as Old Knebworth still have commercial washrooms and kitchens: in halls, pubs, schools, care homes and farm-based businesses. Mould gets into sealant in any washroom that doesn’t dry out, and once it’s in, the sealant is replaced.
Guaranteed is the last step of every job. Our workmanship is backed for 12 months, and we explain exactly what that covers when we quote.
- Location
- Old Knebworth (SG3)
- Wider area
- Hertfordshire
- Guarantee
- A 12-month guarantee
- Quotes
- Quoted before any work starts
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
What we can’t put right
Our job is the joint, not everything around it. Sealant alone won’t deal with:
- Condensation from failed extract fans
- Water from plumbing, not from a joint
- Hollow tiles or loose panels behind the joint
If you are not sure, just call the office on 01277 525 020 or use the quote form and we’ll give you a straight answer.
Surfaces we seal
- Vanity units and basins
- Kitchens and tea points
- Accessible toilets and changing rooms
- Showers, trays and wet room floors
- IPS panels and cubicles
- Urinals and WCs
Different surfaces, different methods
Wet-room floors and floor-to-wall joints
Wet-room floors and the joints where flooring turns up the wall need to stay sound. We reseal the floor-to-wall junctions and around drains where sealant is used.
Urinals and WC pans
Urinal backs, troughs and slab joints are resealed with sanitary silicone once the whole of the old bead has gone.
Looking after the joints
Every sealant joint needs some looking after, and how long they last depends on how they’re treated. We suggest:
- Clear standing water from shower floors where possible
- Share your site rules when you send details
- Avoid scourers and harsh descalers on silicone
- Note failing joints building by building
Where possible, have shower floors and trays squeegeed after busy periods. Joints that sit wet for hours fail sooner.
Water getting behind IPS panels and vanity units can swell the boards. Once that happens, a reseal won’t fix them.
Diagnose, treat, sign off
Occupied buildings need a little choreography. The work area is signed and kept contained, with routes through the building left open and work section by section so the rest of the building stays in use. Smaller jobs around Old Knebworth can be grouped with others nearby, which keeps travel down. A fixed quote is given before anything starts.
- We inspect each washroom and record the joints to be resealed.
- You get a fixed quote with the phasing plan.
- Old sealant is removed completely and the faces cleaned.
- Each joint is cleaned and left dry.
- New anti-mould sealant goes in and is tooled neat.
- Rooms reopen after the cure time.
Preparing the site
- Let building users know which areas are affected
- Agree which areas must stay open
- Tell us your opening times and when work is allowed
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.
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Washroom sealing in Old Knebworth: the local picture
Central London is about 26 miles from Old Knebworth, in a commuter belt where offices and business parks are common. Office washrooms on business parks see heavy weekday use, and resealing in phases keeps facilities available.
For a hall at a building such as Church of St Mary and St Thomas, resealing the kitchen and toilets can be fitted between bookings. Healthcare estates like Lister Hospital, 3.7 miles north of Old Knebworth, expect contractors to follow their permits and cleaning rules in every washroom.
Old Knebworth is about 3 miles south-west of Stevenage, in Hertfordshire. We cover commercial sites throughout Old Knebworth, for single jobs and planned programmes alike. 371 places across Hertfordshire fall within our area, Old Knebworth among them. We also cover London, around 26 miles from Old Knebworth.
We take on washrooms and wet areas across the SG3 postcode area, whatever the building. Streets here include Old Knebworth Lane and Park Lane. We also cover Nup End Green (1 mile south-west), Driver's End (1 mile south-west), Rableyheath (1 mile south), Pottersheath (1 mile south) and Langley (2 miles north-west) for washrooms and wet areas. Nearby towns on our patch include Hemel Hempstead (13 miles south-west), Stevenage (3 miles north-east), St Albans (10 miles south-west), Welwyn Garden City (5 miles south), Harpenden (7 miles south-west) and Hitchin (6 miles north-west).
Local landmarks in Old Knebworth
Recent enquiries here include premises near Knebworth Park and Robin Hood And Little John Public House, among other places. The nearest railway station is Knebworth station, about 1 mile east of the centre. Well-known places in the area include Lister Hospital (3.7 miles north) and Stevenage Museum (2.2 miles north). Open spaces near Old Knebworth include Mardley Heath.
Towns and villages near Old Knebworth
What else we do in Old Knebworth
Quoting for work in Old Knebworth
These are the things that shape the price:
- The size and state of each joint
- Any access equipment needed
- Removal of failed or old sealant
- The total length or number of joints
Cost follows what’s involved: stripping out, preparation, sealing, access and phasing. Call for a quote and we’ll explain how it’s made up.
Details that help us quote
The more we know, the firmer the quote. Helpful details to send:
- What the building is and how it’s used
- How the joints are reached, and at what height
- Photos of the joints, close up and from further back
- Any dates the work must fit around
A handful of photographs and a postcode is the fastest way to a quote. Send them through the quote form, or give us a call on 01277 525 020 or email a schedule or drawings if you’d rather talk the job through.
Questions about Old Knebworth
Is hospital work, at somewhere like Lister Hospital, something you do?
Yes. Healthcare sites are among the places we work. The estates team’s permit system and infection-control rules come first, and the work is planned around them.
Is Old Knebworth too small for you to travel to?
Not at all. Old Knebworth is within our area. London and every South East county are within our area. Send photos and a list of what needs doing, and we’ll plan the job to need as few trips as possible.
How do I request a quote?
You can use the quote form on this site; alternatively, call the office on 01277 525 020 or email the details over. Photos, drawings or a joint schedule help us quote quickly.
Do you hold CHAS accreditation?
Yes. CHAS accredited, Constructionline member, and our applicators hold CSCS cards.
Will cleaning remove black mould from sealant?
Normally not. Mould grows into the sealant itself, so it comes back however often it’s cleaned. Replacement is the lasting fix.
How long does a job like this take?
That varies with the scale of the job, though a typical visit normally takes a few hours for one toilet block, with bigger buildings phased across a number of visits. Larger or phased jobs take longer, and we’ll give you a timescale with the quote.
Which silicone is right for commercial washrooms?
Sanitary silicone with anti-mould additives in most cases. Neutral-cure grades are used where acetoxy types could mark metals, stone or mirror backings.
Signs you need washroom sealing in Old Knebworth
A lot of failed washroom sealant was laid over an old bead or a dirty surface. Silicone won’t adhere to a silicone bead so it peels away quickly.
If one of these sounds familiar, it’s time for a closer look:
- Washrooms that look worn because of the sealant
- A new bead over an old one coming away
- Open joints along basins and vanity units
- Black mould inside silicone joints that cleaning can’t shift
For a hotel such as The Roebuck Hotel, 1.2 miles to the north-east of Old Knebworth, resealing en suites a few rooms at a time keeps the rest available.
What to look for in a quote
- Will RAMS and insurance details be available?
- Their public liability cover
- Their pre-qualification and accreditations
- Their approach to joint depth and backing