Hertfordshire · England
Fire-rated sealant in Knebworth, Hertfordshire
Fire rated sealant in Knebworth from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Door frames with gaps between frame and wall
- Seals cut through by electricians, plumbers or data installers
- Unsealed gaps where pipes and cables go through a wall
How we handle fire rated sealant in Knebworth
A gap around a door frame, a linear joint at the head of a wall and a hole round a pipe are each sealed differently. Measuring the gap and checking what it’s made of comes first, then the sealant goes in to the depth the product’s details set. We work on plasterboard & masonry, service penetrations and flats & HMOs, and people most often call us about holes left by a change of layout and gaps around pipes and cables through fire-resisting walls.
For a pub, café, guest house or shop in or near Knebworth, its washrooms and kitchen need the same sealant care as any big building.
Every job comes with our 12-month guarantee, wherever you are in Hertfordshire.
- Location
- Knebworth (SG3)
- Wider area
- Hertfordshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Knebworth
You will get a clear quote before any work starts. It’s based on:
- The size of the job
- How much old sealant there is and how hard it is to remove
- How many rooms, windows or areas are involved
- Access and height
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What to tell us for a quote
When you call or email, these details help:
- The problem you’ve noticed
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
- Any previous sealing or DIY work
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, call 0345 464 0079 or drop us an email.
Nearby places to Knebworth
Also in Knebworth
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Do you need fire rated sealant in Knebworth?
Gaps around door frames are easily missed. The architrave hides the gap between frame and wall, so it’s easy to leave unsealed when doors are changed.
Look out for any of the following:
- Sealant items on a fire risk assessment action list
- Cracked or shrunken fire-rated sealant
- Damaged fire sealant left by other trades
- Unsealed gaps around fire door frames
If you look after a church, hall or community building such as Church of St Martin, gaps around pipes and cables are worth checking after any building work there.
Questions to ask before you book
- Whether they’re fully insured
- What the cure time is
- Whether they seal over old material or remove it
- How the surfaces are prepared before sealing
Work for landlords, hotels and businesses
We work for landlords and agents as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Check risers, ceiling voids and cupboards during building checks
- File the fire-stopping record where your assessor can find it
- Flag any open gap you spot round a pipe or cable
- Ask every contractor to reseal any fire stopping they disturb
Keep the record we give you with the building’s fire safety documents. It helps whoever checks the building next.
Small gaps around services are simple to deal with while there are only a few. Over time, more work adds more holes and the job gets bigger.
The process
The work is kept neat and contained to the joints we are treating, so you can carry on as normal. Expect the work to take anything from a few hours to several days, depending on how many gaps there are, and we tell you how long to leave it before we go. A visit to Knebworth is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We begin by agreeing the list of gaps from your assessor’s or designer’s requirements.
- Each gap is measured and its substrate and service noted.
- Unsuitable material such as ordinary foam or silicone is cut out and the gap cleaned.
- The specified fire-rated sealant goes in over any backing its detail requires.
- Every location is recorded with the product used for your records.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Tell us about access, such as stairs, a lift or high-level joints
- Move anything stored near the joints
Ask for a quote
Every job is quoted individually. Just ring 0345 464 0079 or email us with the details, and pictures are welcome.
Advice
Fire rated sealant around Knebworth
Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, and gaps around services are often picked up there. We work to the specification you’re given, installing the product to its tested details.
For landlords with property near Knebworth station, any gap left by new services in shared walls should be closed with a fire-rated product. For site and facilities teams at buildings such as Knebworth Primary and Nursery School, service openings in fire-resisting walls need checking after any refurbishment.
Knebworth is about 3 miles south of Stevenage, in Hertfordshire. Whether you’re in the middle of Knebworth or further out, fire rated sealant is available for homes and businesses alike. We cover 381 towns and villages across Hertfordshire, from the larger towns to small villages. For nearby work, see our London page (26 miles or so).
Postcode districts we cover here for fire rated sealant: SG3. Streets in the area include London Road, Deanscroft and Lytton Fields, all of which we cover. Other places close to Knebworth include Woolmer Green (1 mile south), Bragbury End (1 mile north-east), Oaklands (2 miles south), Datchworth (2 miles south-east) and Shephall (2 miles north). Larger places within reach include Hemel Hempstead (14 miles south-west), Stevenage (3 miles north), St Albans (10 miles south-west), Bishop's Stortford (15 miles east), Welwyn Garden City (5 miles south) and Harpenden (8 miles south-west).
Near you in Knebworth
In Knebworth, that means homes and buildings near Barnwell School and Knebworth Park. Knebworth has its own railway station: Knebworth station. Well-known places in the area include Benington Castle (3.6 miles north-east) and Datchworth Museum (1.7 miles south-east). Open spaces near Knebworth include Mardley Heath.
Honest limits
In fairness, there are a few things sealant won’t fix:
- Big openings where sealant alone isn’t the tested solution
- Problems with the door itself rather than the gap around the frame
- A wall that is not a fire-resisting element to begin with
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Door frames
- Pipe & cable gaps
- Flats & HMOs
- Plasterboard & masonry
- Service penetrations
- Linear gaps
Your questions about fire rated sealant in Knebworth
Can you do fire rated sealant in Knebworth?
Yes. Our work covers London and the South East, and Knebworth is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Do you work for landlords with property near Knebworth station?
Yes, we work for landlords and agents. You can phone 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Can I use normal mastic around a pipe through a fire wall?
No. It might close the gap, but it is not a fire-rated seal. A tested fire-rated product is needed, or ask us to do it.
Are you fully insured?
Yes. We are fully insured for every job we do.
Where are you based?
Our base is Crawley. Our area covers South East England, London and Scotland.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Can you give us a record of the work?
Yes. We note each location and the product that went in so it’s there for the next inspection.
What fire rating will the seal have?
We don’t give ratings or certificates for our work. Your specification sets the requirement, and we apply a product tested for it, recording the locations and products.