Greater London · England

Lewisham Floor Joint Sealing

Floor joint sealing across Lewisham and nearby, with old sealant always removed completely and a 12-month guarantee.

  • Skirting that has pulled away from the floor
  • Perimeter joints in tiled floors filled with grout
  • Failed seals where bathroom floors meet baths and panels

Need floor joint sealing in Lewisham?

Floor joint sealing in Lewisham, done properly

Where skirting is painted, we can use a flexible sealant that takes paint. For bathrooms and kitchens, silicone is normally the better choice. If you have gaps between floors and kitchen plinths and chipped and open joints in warehouse floors, we can help.

New flats are going up across London, many of them in larger developments. In a new development, snags are often reported through the developer or the managing agent, and failed shower seals, open skirting joints and gaps at thresholds are typical.

Every job comes with a 12-month guarantee, wherever you are in Greater London.

Eleven members of the Mr Mastic team standing in front of branded white vans
Place
Lewisham (SE13, SE8, SE6)
Wider area
Greater London
Guarantee
12 months on all our work
Price
A clear quote up front
Telephone
0345 464 0079
Updated
26 October 2026

What sealant work can’t fix

To be straight with you, some problems need a different trade:

  • Tiles that have lifted or broken
  • Failed waterproofing under a wet room floor
  • Structural movement or subsidence

If in doubt, call 0345 464 0079 or email us and we’ll say what we think.

Surfaces we seal

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

Different surfaces, different methods

Commercial floors

In commercial buildings, we can plan floor joint work around opening hours. Out-of-hours working can be arranged.

Tiled floors

Perimeter joints in tiled floors should be sealant, not grout. Grout at the edge is removed and replaced with sealant.

What we’re called out for in Lewisham

A floor laid tight to the walls has no room to move. As it expands, the edges lift or crack.

The problems people usually mention when they call include:

  • Rigid edge joints in tiled floors
  • Skirting that has pulled away from the floor
  • Dirt and water collecting in open floor joints
  • Worn sealant at door thresholds

Managing a site like St Saviour's Catholic Primary School? Then floor and threshold joints in busy corridors wear quickly and are best resealed early.

What to look for in a quote

  • Who turns up on the day
  • How the colour is chosen
  • What the quote includes, VAT included or not
  • When the joint can take water or movement

Choosing a sealant specialist

For landlords and businesses

Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.

For anyone letting property in or around Lewisham, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.

Questions from Lewisham

Is Lewisham in your area for floor joint sealing?

Yes, Lewisham is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing.

I let a flat near Lewisham station. Can you help?

Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.

Is caulk good enough for skirting?

Caulk can’t cope with movement or water. Floor edges move through the year, so a flexible sealant suits them better.

Are you ARBOMaster approved?

Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.

What do you put in the joint?

Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.

Are you insured?

Yes. We are fully insured, and we can confirm the details when we quote.

Will the old sealant be removed?

Yes. All of the old material is cut out and the joint cleaned before applying anything new.

Can you reseal concrete floor joints in an industrial unit?

Yes, from warehouses and units to offices and shops. We can plan around your opening times with out-of-hours work where needed.

Floor joint sealing around Lewisham

Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent. 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. The joint at the skirting or threshold has to allow for that.

Letting a property close to Lewisham station? Then gaps at skirtings and thresholds are worth sealing between tenancies. As a London address, Lewisham can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.

Lewisham is about 3 miles west of Eltham, in Greater London. Lewisham gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our Greater London coverage runs to 764 places, and Lewisham is one of them.

Jobs for floor joint sealing in SE13, SE8 and SE6 works the same way as everywhere else we cover. Whether your property is on Station Road, Lewisham High Street and Lewis Grove or anywhere close by, we can help. Lewisham is on the B220, so it’s easy for us to get to. Close by, we work in Ladywell (1 mile south-west), St Johns (1 mile north-west), Hither Green (1 mile south-east), Blackheath (1 mile north-east) and Lee (1 mile south-east). Larger places within reach include London (4 miles north-west), City of Westminster (7 miles north-west), Marylebone (7 miles north-west), Kensington (9 miles west), St Pancras (6 miles north-west) and Shoreditch (5 miles north-west).

Near you in Lewisham

Around Lewisham, our work takes us to homes and buildings near St Joseph's Academy, Ladywell Fields and The Watch House. Lewisham has its own railway station: Lewisham station. A little further out are Greenwich Castle (1.2 miles north) and Fan Museum (1.2 miles north). The countryside around Lewisham includes Knight's Hill and Brookmill Road Local Nature Reserve.

Map of Lewisham © OpenStreetMap contributors

What happens on the day

We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours, depending on the length of joint. For a job in Lewisham, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.

  1. First, the floor type, the gap and the traffic are checked.
  2. Any old caulk, grout or sealant is raked or cut out.
  3. We vacuum out the joint and add backing where the depth needs setting.
  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.

Preparing for the visit

  • Clear the area around the work
  • Let us know about parking restrictions
  • Tell us about access, such as stairs, a lift or high-level joints

Get a quote

If you’re in Lewisham and need floor joint sealing, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.

Get a quick quote

Read more

Why deal with it now?

Dirt builds up in open joints and makes the floor look worn. A neat sealed joint is easier to clean and look tidier. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Lewisham, the repair is bigger than a sealant job.

The cost depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.

Why Lewisham clients choose us

  • Tidy, careful work
  • Arbo and Everbuild products
  • Anti-fungal silicone where joints get wet
  • Rated 4.9 stars on Google

Read what affects the cost and what customers say.

DIY versus a professional finish

Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.

A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.

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