City of London · England

City of London Floor Joint Sealing

Floor joint sealing for City of London and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.

  • Open joints around bathroom floor edges
  • Dirt and water collecting in open floor joints
  • Perimeter joints in tiled floors filled with grout

Need floor joint sealing in City of London?

About our floor joint sealing in City of London

Painted skirting can be sealed with a flexible product that can be painted over. In wet areas we’d normally use silicone. If you are dealing with gaps at thresholds between rooms and chipped and open joints in warehouse floors, we can put it right, whatever the surface.

Across London, commercial floors have movement joints that break down under heavy foot traffic, and new homes need their plot mastic finished properly before handover, in City of London and beyond.

The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.

The Mr Mastic team in navy uniforms in front of three Mr Mastic vans
Where
City of London (EC4V, EC1A, EC2M, EC2Y)
Wider area
City of London
Guarantee
One year on every job
Quote
Quoted before any work starts
Call
0345 464 0079
Last updated
26 October 2026

City of London questions

Is parking a problem for a job in City of London?

It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.

I let a flat near London Cannon Street station. Can you help?

Yes. We work for landlords and agents as well as homeowners. You can phone 0345 464 0079 or send us an email with the details for a clear quote.

Will the old sealant be removed?

Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.

Do you use a paintable sealant?

On joints you want to paint, yes. Silicone doesn’t take paint, so tell us your plans.

Will you leave a mess?

We keep the work tidy. We protect what’s around the joints, and we clear up when we are done.

Can you reseal concrete floor joints in an industrial unit?

Yes. Old filler is cleaned out and the joint resealed with a floor-joint product. Let us know about the traffic.

Do the sealants smell?

Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.

Do I need to be at home?

For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.

Can I do it myself?

Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, 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 need the right product, the right access and the right method.

How the visit works

On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes a few hours, depending on the length of joint, including the tidy-up. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.

  1. We start by checking the floor, the joint and what traffic it takes.
  2. Any old caulk, grout or sealant is raked or cut out.
  3. The joint is vacuumed clean and backing fitted where needed.
  4. We apply the sealant in a colour that suits the floor.
  5. We tool it neatly and tell you when it can be walked on and cleaned.

How to prepare

  • Keep pets and children clear of the area while we work
  • On commercial sites, let us know about site rules
  • Move anything stored near the joints

Getting a quote

To get a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. You will have a clear quote before any work starts.

Get a price

Read more

When something else is needed

In fairness, some problems need a different trade:

  • Water getting under the tiles from elsewhere
  • Tiles that have lifted or broken
  • Bouncy or failing floorboards

If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.

What we seal

  • Tiled floors
  • Thresholds
  • Wet room & bathroom floors
  • Concrete floor joints
  • Skirting boards
  • Commercial floors

Do you need floor joint sealing in City of London?

Water and dirt collect in open floor joints. In kitchens and bathrooms, mop water gets into the gap.

The problems people normally mention when they call include:

  • Concrete floor joints that have broken down
  • Open joints that fill with dirt
  • Open joints around bathroom floor edges
  • Open gaps along the bottom of skirting boards

Letting a property close to London Cannon Street station? Then gaps at skirtings and thresholds are worth sealing between tenancies.

Comparing quotes

  • Whether all the old sealant comes out first
  • How the surfaces are prepared before sealing
  • How much experience the applicator has
  • Whether the sealant suits the joint

How to choose a mastic man

Different surfaces, different methods

Concrete floor joints

Open concrete joints chip at the edges when wheels cross them. Sealing them supports the edges.

Thresholds

Threshold joints get a lot of feet, so we choose a hard-wearing, flexible product.

Joints and finishes in City of London homes

Across City of London, floors range from older suspended timber floors to concrete slabs in newer homes and commercial units, and they don’t all move the same way. That’s why the skirting and threshold joints need a flexible seal. Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent.

For buildings such as St Olave Old Jewry, joints in its floors, skirtings and thresholds need resealing as they wear. City of London is in London, so parking needs planning: let us know about parking bays, permits or a driveway.

City of London is about 1 mile north of London, in City of London. Whether you are in the middle of City of London or further out, we cover floor joint sealing for every kind of property, from flats and houses to offices and hotels.

Jobs for floor joint sealing in EC4V, EC1A, EC2M and EC2Y works the same way as everywhere else we cover. Whether your property is on Aldermanbury Square, Monkwell Square and Paternoster Square or a nearby road, our applicators can take on the job. With the A1 and A3 close by, City of London is simple for us to get to. Close by, we work in Barbican Estate (1 mile north), Bishopsgate (1 mile east), Finsbury (1 mile north), Aldgate (1 mile east) and St Luke's (1 mile north).

Landmarks near City of London

Around City of London, our work takes us to homes and buildings near St Mary-at-Hill, Prior Weston Primary School and Children's Centre and Golden Fleece pub, among other places. Other local landmarks include Central Foundation Boys' School (0.8 miles north), Barts Health Archives (less than half a mile north-west) and St Alphage Garden (less than half a mile north). There’s a railway station in City of London itself: London Cannon Street station. Other landmarks nearby include Gabriel's Wharf (0.8 miles south-west) and London Mithraeum (within half a mile south). Open spaces near City of London include St. James's Park Lake and Barnsbury Wood.

Map of City of London © OpenStreetMap contributors

Why it’s worth doing now in City of London

Regrouting a cracked line in a tiled floor rarely fixes it. The movement is still there, so the grout fails again. A flexible movement joint is the fix. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in City of London, the repair is bigger than the sealant job would have been.

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 you get with us

  • Full insurance on every job
  • Homes, businesses and hotels
  • Sanitary silicone with an anti-fungal additive in wet areas
  • Rated 4.9 stars on Google

See what affects the cost or our reviews.

Landlords, agents and businesses in City of London

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.

We regularly work with letting and managing agents. Tell us the address, the job and how access works.

20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job