Hertfordshire · England
Commercial Sealant in Old Knebworth
Our applicators work in Old Knebworth on sealant work for offices, hotels, washrooms and commercial buildings. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Black, stained silicone in guest bathrooms
- Leaking joints in shower rooms and changing areas
- Worktop sealant that has shrunk and stained
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
About our commercial sealant in Old Knebworth
Staff facilities can’t be out of action for long. Early starts and out-of-hours work can be arranged to keep disruption down. You’re told when each area can be used again. We work on welfare facilities, hotel bathrooms and office washrooms & kitchens, and the jobs we see most are tired sealant ahead of a health and safety audit and shower leaks reaching the floor below.
Work in a small place like Old Knebworth is planned ahead, journey included, so the job can fit around bookings, guests or opening times where possible.
All our work comes with a 12-month guarantee, wherever you are in Hertfordshire.
- Location
- Old Knebworth (SG3)
- Region
- Hertfordshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
When something else is needed
We won’t take on work that will not last, so here’s what sealant cannot put right:
- A broken extractor fan behind the mould problem
- Tiles coming off the wall
- Assessing what fire stopping a building needs
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer.
Where we work in Old Knebworth
- Retail & leisure sites
- Student & care accommodation
- Welfare facilities
- Hotel bathrooms
- Rental portfolios
- Office washrooms & kitchens
Why act early in Old Knebworth
Fixing rooms one complaint at a time is the slow way. A planned programme works through every room, with less disruption and one clear quote. Where a wall is exposed, as many are in small places like Old Knebworth, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why Old Knebworth clients choose us
- Colour picked to suit the job
- 4.9 on Google from 180+ five-star reviews
- Sanitary silicone with an anti-fungal additive in wet areas
- A 12-month guarantee on all work
Read our cost guide or customer reviews.
Towns and villages near Old Knebworth
Other services in Old Knebworth
Commercial sealant in Old Knebworth: local notes
Hard water is the norm across most of the South East, so limescale builds up on sealant, grout and fittings.
If you look after a building such as Barnwell School, washroom and kitchen sealant can be programmed around term times or opening hours. If you let a flat or house near Knebworth station, we can quote for one property or a whole portfolio of rentals.
Old Knebworth is about 3 miles south-west of Stevenage, in Hertfordshire. Homes, rented property, offices and hotels in Old Knebworth is covered for commercial sealant. Every job comes with our 12-month guarantee. Old Knebworth is one of 381 towns and villages in Hertfordshire where we work for commercial sealant. There’s also a page for London, roughly 26 miles from Old Knebworth.
We work across the SG3 postcode area for commercial sealant. If you need commercial sealant at a property on Old Knebworth Lane and Park Lane or a nearby road, we can help. Neighbouring places we cover for commercial sealant include 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). Within a short drive, we also cover 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).
Around Old Knebworth
In Old Knebworth, that means homes and buildings near Knebworth Park and Robin Hood And Little John Public House and the streets around them. 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). For a walk, there’s Mardley Heath.
The process
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for a single washroom, longer for a whole building. For a village or hamlet like Old Knebworth, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- Tell us the rooms, hours and site rules, and we’ll plan the programme.
- Tell us what paperwork your site needs, and we confirm what we can supply before work begins.
- In each room, the old bead comes out and the joint is cleaned and treated.
- Anti-fungal sanitary silicone goes into wet areas, with suitable sealant elsewhere.
- Each finished area is checked with you and given a cure time.
How to prepare
- Mention any tricky access
- Where the joints are inside, avoid wetting them before we arrive
- Mention any sign-in or site rules at work premises
Getting a quote
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
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Old Knebworth questions
Do you cover Old Knebworth for commercial sealant?
Yes, Old Knebworth is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
Do you work for landlords with property near Knebworth station?
Yes. We work for letting agents and landlords as well as homeowners. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Will the old sealant be removed?
Yes, every time. New silicone does not stick to old silicone, so the joint is cleaned back first.
How soon can a room be used after resealing?
Plan for around 24 hours, or the cure time we give for that area. A room-by-room programme keeps only a few rooms out at once.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Quotes for commercial sealant in Old Knebworth
The quote reflects the job in front of us. We look at:
- The type of sealant required
- How many areas need sealing
- Whether old sealant or filler has to be cut out
- The number and length of the joints
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What to tell us for a quote
What to tell us when you ask for a quote:
- How we’d reach the joints
- What’s wrong with the joints now
- Pictures of the joints, sent by email
- The rough size of the job
Need a quote? Please ring 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear price before we start.
Do you need commercial sealant in Old Knebworth?
Commercial buildings settle and move with temperature, and lightweight partitions flex more than masonry. Joints between different materials take the strain.
Look out for these signs:
- Large numbers of bathrooms needing the same work
- Failed floor-level joints in accessible wet rooms
- Silicone laid over old silicone by a previous contractor
- Rental bathrooms that need resealing between tenants
If you look after a church, hall or community building such as Church of St Mary and St Thomas, halls and community kitchens see heavy use, and their sealant shows it.
What to look for in a quote
- Whether they’re fully insured
- What product goes in the joint
- What guarantee comes with the work
- How the surfaces are prepared before sealing
For landlords and businesses
For anyone letting property in or around Old Knebworth, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
We work for landlords and agents as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.