Greater London · England
Commercial Sealant in Streatham
Our applicators work in Streatham on sealant work for offices, hotels, washrooms and commercial buildings. Old sealant removed completely, joints prepared properly.
- Split sealant around staff kitchen worktops and sinks
- Leaks from showers into rooms or ceilings below
- Split sealant where wet room floors meet walls
How we handle commercial sealant in Streatham
Guest bathrooms are cleaned every day and used by different people every night, so sealant wears out faster than it would at home. Rooms are resealed in batches, so only a few are out of use at once. We work on student & care accommodation, welfare facilities and retail & leisure sites, and people most often call us about leaks from showers into rooms or ceilings below and tired sealant ahead of a health and safety audit.
London’s offices, shops, hotels, student accommodation and blocks of flats all have joints to look after, whether that is washroom resealing or fire-rated sealant around service openings. Out-of-hours working can be arranged where a building in Streatham cannot close.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Streatham (SW16, SW2, CR4, SW12)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
FAQs for Streatham
Is parking a problem for a job in Streatham?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Can you do commercial sealant in Streatham?
Yes. Our work covers London and the South East, and Streatham is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear price.
Is out-of-hours working possible?
It can be arranged for many jobs. We’ll confirm the working hours with your quote.
Can you work around guests in a hotel?
Yes. The order and timing are agreed with your team, and you will know when each room can be used.
How long will you be here?
That depends on how much there is to do, but most jobs take a morning for a small washroom, and a planned programme for bigger sites. We’ll give you a better idea when we quote.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Where do you work from?
We work from Crawley. We cover Streatham and the rest of Greater London, along with the rest of our area.
What should I tell you?
A short description and the location, plus pictures if you have them. We will ask anything else we need to know.
Towns and villages near Streatham
Other services in Streatham
Why act early in Streatham
Room by room, the work is quick: it takes anything from a few hours to several days, depending on the number of rooms. Each area is then left to cure for the time we give you, so the programme is planned around cure times. In a flat in Streatham, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
The cost depends on how much there is to do, how much old material has to come out and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Streatham
- We agree the colour with you first
- 4.9 on Google from 180+ five-star reviews
- Colour picked to suit the job
- 20+ years of sealant experience
Read what affects the cost and what customers say.
DIY sealant or a professional job?
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.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
Commercial sealant in Streatham: local notes
Commercial buildings in London often have strict access rules and limited loading, so out-of-hours working can be arranged where needed. London has hard water, so limescale builds up on sealant, grout and fittings, and it has to be cleaned off before new sealant goes in.
Managing a site like St Andrew's Catholic Primary School? Then busy washrooms and kitchens can be resealed in phases so they stay open. Rented homes near Streatham station change hands often, and several rental properties can be resealed on one programme.
Streatham is about 5 miles south of London, in Greater London. Across the SW16 area, we cover commercial sealant for homes and businesses. Across Greater London, we cover 764 places, and Streatham is one of them.
Every address in SW16, SW2, CR4 and SW12 is within our area for commercial sealant. Whether your property is on Stanthorpe Road, Gleneagle Mews and Madeira Road or anywhere close by, we can help. You’ll find Streatham on the A205 and A216, so it’s easy for us to get to with everything needed for commercial sealant. Other places close to Streatham include Streatham Park (1 mile west), Furzedown (1 mile west), Streatham Hill (1 mile north), Hyde farm estate (1 mile north) and Grange Mills (1 mile north-west). Further out, we also cover London (5 miles north), City of Westminster (6 miles north), Marylebone (6 miles north), Kensington (6 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Around Streatham
Typical jobs here are in homes near Bishop Thomas Grant Catholic Secondary School, Streatham Common and Waldorf School of South West London and the streets around them. There’s a railway station in Streatham itself: Streatham station. A little further out are Clockworks Museum (1.1 miles east) and Southside Wandsworth (3.3 miles north-west). Not far away are Knight's Hill and Battersea Park Lake.
Common problems we fix in Streatham
Plenty of commercial bathrooms have no window at all, so if the fan is weak, steam lingers and the sealant stays damp. Mould then takes hold in the silicone.
People normally contact us when they notice one of these:
- Silicone laid over old silicone by a previous contractor
- Joints that need doing before an inspection or audit
- Worktop sealant that has shrunk and stained
- Washroom sealant that looks dirty however often it’s cleaned
Community buildings like St Leonard's Church are part of the picture too: halls and community kitchens see heavy use, and their sealant shows it.
What to look for in a quote
- Whether they’re fully insured
- The length of the guarantee
- How the surfaces are prepared before sealing
- Is VAT in the price?
Landlords, agents and businesses in Streatham
Landlords and agents in Streatham can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
How to look after the new joints
To keep the joints looking good and working properly:
- Schedule work around occupancy
- Note the date each area was done
- Do not leave a failed joint until the next refurbishment
- Keep extractor fans working and serviced
Squeegees in guest and staff showers help: walls and trays dry faster, and so does the sealant.
Signs to look for: mould, splits, peeling corners or water marks downstairs. When you see them, it’s time to plan a reseal.
What we cannot put right
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Leaking pipework, valves or wastes (a plumber’s job)
- Failed tanking or loose tiles behind the sealant
- Poor ventilation that keeps bringing mould back
If in doubt, ring 0345 464 0079 or email us and we will say what we think before booking.
Where we work in Streatham
- Rental portfolios
- Student & care accommodation
- Retail & leisure sites
- Office washrooms & kitchens
- Hotel bathrooms
- Welfare facilities
What we do, step by step
On the day, we look over the joints with you first. We protect the surfaces around the joints before we start. Most jobs take a few hours for a single washroom, longer for a whole building. 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.
- We start by looking at the rooms and agreeing what’s needed.
- Working hours are agreed, including early starts or out-of-hours work where it can be arranged.
- Each area is protected and stripped of old sealant.
- Once dry, every joint is resealed and tooled.
- We let your team know the cure time for every area.
Before we arrive
- Move anything stored near the joints
- Mention any sign-in or site rules at work premises
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
If you’re in Streatham and need commercial sealant, call 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.