Greater London · England
Islington Floor Joint Sealing
Our applicators work in Islington on sealing skirting-to-floor joints, tiled floor movement joints and concrete floor joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Failed seals where bathroom floors meet baths and panels
- Dirt and water collecting in open floor joints
- Grout cracking in a straight line across a floor
About our floor joint sealing in Islington
Wet-area floor joints keep water out of the gap behind skirting and plinths. We seal them with a flexible, water-resistant sealant so water and dirt can’t get in. Typical jobs include floor edges that trap water and grime and cracked grout where a tiled floor needs a movement joint, on wet room & bathroom floors, concrete floor joints and skirting boards.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Wherever a floor meets a wall, a skirting or a threshold, the joint has to allow for movement, in Islington as anywhere.
Our work is backed for twelve months, in Islington and everywhere else we cover.
- Location
- Islington (N1, N7, NW1, EC1V)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Can I do it myself?
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.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Common problems we fix in Islington
Wheels crossing an unfilled concrete joint chip its edges. Pallet trucks and trolleys knock the edges away until the joint widens.
Any of these means the joints need attention:
- Skirting caulk that keeps splitting
- Threshold joints that have opened or worn
- Tiled floors with no room to move
- Concrete floor joints that have broken down
Rented homes near Essex Road station change hands often, and open skirting and floor joints collect dirt and water, so seal them while the property is empty.
Comparing quotes
- Whether they’re fully insured
- When the joint can take water or movement
- How long the guarantee is
- Which sealant they’ll use, and why
Leave it or put it right?
The right product depends on the floor and the traffic: skirting and tiled floors need flexibility, wet areas need water resistance and concrete needs a product suited to wheels. Using the wrong one is why many floor joints fail. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Islington, the repair is bigger than a sealant job.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why choose Mr Mastic in Islington
- White, clear, grey or coloured to suit, where the product allows
- Anti-fungal sanitary silicone in wet areas
- Every job guaranteed for a year
- We never seal over old sealant
Take a look at how sealant jobs are priced and our reviews.
Places near Islington
Other services in Islington
What affects the cost of floor joint sealing
The price is agreed before any work begins. It’s based on:
- Whether there’s mould to deal with
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- The old material and how stubborn it is
Doing several joints on one visit is generally more efficient than separate visits. We will send you a clear quote for the lot.
Asking for a quote
When you contact us, these details help:
- The address or postcode of the job
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, phone 0345 464 0079 or email us.
Questions from Islington
Do you work for landlords with property near Essex Road station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before work begins.
Is Islington in your area for floor joint sealing?
Yes. Our work covers London and the South East, and Islington is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
How much does floor joint sealing cost in Islington?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Will I be able to paint over the new joint?
For painted skirting, we use a flexible product that can be painted. Silicone will not take paint, so we use it where the joint stays unpainted.
How long does floor joint sealing take?
Typically it takes a few hours for most rooms, longer for large commercial floors. Bigger jobs take longer.
Will you leave a mess?
Tidy work is part of the job. We protect what’s around the joints.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Can you reseal concrete floor joints in an industrial unit?
Yes. We reseal concrete floor joints in commercial and industrial units. We’ll talk through the traffic and choose a sealant suited to it.
What the job involves on each surface
Thresholds
Thresholds between rooms meet two floors and often a door frame. We seal them with a flexible sealant that suits both sides.
Commercial floors
Washroom and kitchen floors in commercial buildings need sound edge joints. They’re resealed with a flexible, water-resistant sealant.
What we do, step by step
The work is kept neat and contained to the joints we are treating, so you can carry on as normal. The job normally takes a morning or an afternoon for most homes, and we tell you how long to leave it before we go. In a London area like Islington, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We start by checking the floor, the joint and what traffic it takes.
- Any old caulk, grout or sealant is raked or cut out.
- We vacuum out the joint and add backing where the depth needs setting.
- We apply the sealant in a colour that suits the floor.
- We tool it neatly and tell you when it can be walked on and cleaned.
How to prepare
- Let us know about stairs, lifts or work at height
- On commercial sites, let us know about site rules
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
If you’re in Islington and need floor joint sealing, call 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
Advice
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
For anyone letting property in or around Islington, several properties can go on one quote. Send us the addresses and the work at each, and pictures by email help.
What floor joint sealing looks like in Islington
Across Greater London, floors range from older suspended timber floors to concrete slabs in newer homes and commercial units, and they do not all move the same way. That is why the skirting and threshold joints need a flexible seal. Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent.
Managing a site like Islington Proprietary School? Then entrance and corridor floor joints take a lot of traffic. If you look after a church, hall or community building such as St Mary's Church, joints in its floors, skirtings and thresholds need resealing as they wear.
Islington is about 3 miles north-east of City of Westminster, in Greater London. If you need floor joint sealing in Islington, please phone 0345 464 0079 or send us an email for a quick quote. We cover Greater London from our Crawley base. Our area takes in 764 places across Greater London, from the larger towns to small villages.
All of N1, N7, NW1 and EC1V is covered for floor joint sealing, from the main roads to the quietest streets. Whether your property is on Gibson Square, Old Royal Free Square and Cloudesley Square or anywhere close by, our applicators can take on the job. You’ll find Islington on the B515 and A5203, which makes it straightforward to reach. We also cover the places around Islington: Pentonville (1 mile south), Angel (1 mile south), Barnsbury (1 mile north-west), Clerkenwell (1 mile south) and Lower Holloway (1 mile north-west). We also work in nearby towns such as London (3 miles south), City of Westminster (3 miles south-west), Kensington (5 miles south-west), Walthamstow (5 miles north-east), Hampstead (3 miles west) and Ruislip (13 miles west).
Local landmarks in Islington
We work in homes and buildings around Islington Green School, The King's Head Public House and Pilsudski Institute of London and the streets around them. Other local landmarks include Barnard Park (less than half a mile south-west) and St Mary's CofE Primary School (within half a mile east). There’s a railway station in Islington itself: Essex Road station. Other landmarks nearby include King's College Hospital Charity (0.7 miles north-west) and Montfichet's Tower (1.7 miles south). For a walk, there’s Barnsbury Wood and Ludgate Hill.