Hampshire · England
Fire-rated sealant in St Leonards, Hampshire
Intumescent and fire-rated sealant around gaps, frames and service penetrations for homes and businesses in St Leonards and across Hampshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Holes left by a change of layout
- Gaps flagged on a fire risk assessment
- Unsealed gaps where pipes and cables go through a wall
Fire rated sealant in St Leonards, done properly
Later work by other trades often breaks through fire stopping, especially in flats, HMOs, offices and schools. One new cable or pipe can leave a gap that nobody goes back to seal. Those are the gaps we close, using a tested fire-rated product. We work on pipe & cable gaps, flats & HMOs and plasterboard & masonry, and people most often call us about gaps filled with a product that isn’t fire-rated and linear gaps at the head of walls.
Commercial work around a smaller place like St Leonards generally means a pub, a shop, a school or small business units rather than office blocks. Each needs the same care with its sealant as any larger building.
Big or small, you get the same 12-month guarantee.
- Place
- St Leonards (BH24)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What happens on the day
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes from a few hours to a few days, depending on the number of gaps and the access. A visit to St Leonards 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 plan the order of work and access, floor by floor or flat by flat.
- Old, damaged or unsuitable sealant is removed.
- Gaps are cleaned of dust and loose material.
- The fire-rated or intumescent sealant is applied and tooled to the tested detail.
- We record what was done and flag anything that needs a different system.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Plan for the work area to be out of bounds to pets and children
- Let us know about earlier repairs to the joints
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or send us an email.
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Should I try it myself first?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
What affects the quote in St Leonards
Every job gets its own quote. This is what makes a difference:
- How many areas need sealing
- The size of the job
- How much old sealant there is and how hard it is to remove
- Access and height
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins.
What we need to know
To help us quote quickly, let us know:
- Whether it’s a home or a business
- The address or postcode of the job
- A few pictures by email, if you can
- What’s wrong with the joints now
For a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Check risers, ceiling voids and cupboards during building checks
- Plan fire stopping into any work that goes through walls or floors
- Get damaged fire seals looked at promptly
- Ask which product was used before you paint
Any fire seal that is cut or drilled needs resealing to its tested detail. If you need new services through a sealed wall, plan the fire stopping as part of the job.
When you plan work that goes through walls or ceilings, plan the fire stopping too. Catching it then saves a separate visit later.
For landlords and businesses
We work for letting agents and landlords as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
St Leonards questions
Is St Leonards in your area for fire rated sealant?
Yes, St Leonards is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Is fire rated sealant in St Leonards guaranteed?
All our work, in St Leonards and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Where is Mr Mastic based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Are you insured?
Yes. We’re fully insured, and we can confirm the details when we quote.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
What should I tell you?
Just the basics: the address or postcode, what’s wrong and any access issues. Then call 0345 464 0079 or send us an email.
Can you match the sealant colour?
Yes. Sealants come in white, clear, grey and other colours for many products, and we’ll agree it with you first.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Commercial buildings in St Leonards
Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, which is often where open fire-stopping gaps are first noticed. We work to the specification you’re given, installing the product to its tested details.
Schools such as St Ives Primary & Nursery School are buildings too, and service openings in fire-resisting walls need checking after any refurbishment. Community buildings like All Saints are part of the picture too: older buildings that have had new heating or wiring often have service gaps worth checking.
St Leonards is in Hampshire. Whether you’re in the middle of St Leonards or further out, we cover fire rated sealant for every kind of property, from flats and houses to offices and hotels. Across Hampshire, we cover 683 places, and St Leonards is one of them. We also work in Southampton, around 21 miles away.
Every address in BH24 is covered for fire rated sealant, from the main roads to the quietest streets. Local streets include Cedar Avenue, Birch Close and Malmesbury Road, all of which we cover. Neighbouring places we cover for fire rated sealant include Ashley Heath (1 mile north), St Ives (1 mile north-east), Matchams (1 mile south-east) and Avon Castle (2 miles east). Larger places within reach include Lymington (14 miles east), New Milton (10 miles south-east), Ringwood (3 miles north-east), Barton on Sea (10 miles south-east), Ashley (10 miles south-east) and Milford on Sea (13 miles south-east).
Local landmarks in St Leonards
Around St Leonards, our work takes us to homes and buildings near Avon Heath Country Park, among other places. A little further out are St Leonard's Hospital (0.9 miles south-west) and Stapehill Abbey (3.9 miles south-west). Not far away are Linbrook Lake and Blashford Lakes.
Why act early in St Leonards
Fire-rated sealants are less forgiving than ordinary ones. Depth, backing and surface preparation all affect how a seal performs, and we work to the product details every time. In an older home around St Leonards, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why St Leonards customers choose us
- We never seal over old sealant
- Sanitary silicone with an anti-fungal additive in wet areas
- Arbo and Everbuild products
- 4.9 on Google from 180+ five-star reviews
Read our cost guide and customer reviews.
Different surfaces, different methods
Masonry and concrete
Masonry is dusty and porous, so preparation matters. We brush and vacuum the gap and use backing where the detail needs it before applying the sealant.
Linear gaps
Gaps along the top of partitions are easy to miss above a ceiling. We seal them along their full length leaving no stretch unsealed.