Greater London · England
Charing Cross External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Charing Cross, with a one-year guarantee on every job. Ask us for a quote.
- Old sealant gone brittle and cracked
- Panel joints letting water in
- Movement joints with cracked, split or missing sealant
Outside joints around Charing Cross
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
For site and facilities teams at buildings such as Soho Parish CofE Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. As a London address, Charing Cross can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Charing Cross is about 1 mile south-east of City of Westminster, in Greater London. Every kind of property in Charing Cross can book us for external mastic. Every job comes with our one-year guarantee. 764 places in Greater London are on our list, from the larger towns to small villages.
Work in W1F, W1D and W1S works the same way as everywhere else we cover. We cover properties on Duck Lane, Drury Lane and Bridle Lane. Main roads around Charing Cross include the A4 and A301. Other places close to Charing Cross include St James's (1 mile west), Adelphi (1 mile north-east), Chinatown (1 mile north-west), West End (1 mile north) and Covent Garden (1 mile north-east). Further out, we also cover Kensington (3 miles west), Walthamstow (7 miles north-east), Hoxton (3 miles north-east), Whitechapel (3 miles east), Hampstead (4 miles north-west) and Ruislip (13 miles west).
What’s near Charing Cross
Locally, jobs take us to homes and businesses close to Westminster Abbey Choir School, Silver Cross Tavern and Harris Westminster Sixth Form. Nearby too are London Library (less than half a mile west) and Victoria Embankment Gardens (under half a mile east). There’s a railway station in Charing Cross itself: London Charing Cross station. Other landmarks nearby include Montfichet's Tower (1.2 miles east) and Royal United Services Institute (under half a mile south). Not far away are Barnsbury Wood and St. James's Park Lake.
External mastic in Charing Cross
A movement joint is a deliberate break that lets a wall expand and contract. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. If you’re dealing with leaking joints around cladding and façade panels and movement joints with cracked, split or missing sealant, we can help.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so a leaking gutter joint or failed wall joint can affect more than one home. In a converted house in Charing Cross, it’s worth checking who is responsible for the outside before booking.
All our work is covered by a 12-month guarantee.
- Where
- Charing Cross (W1F, W1D, W1S)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Do not let climbing plants root in the sealant
- Ask before painting over external sealant
- Wash walls gently around the sealant
- Have failed joints looked at early
Keep pressure washers away from the sealant. High-pressure water can lift the edges over time.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick.
Do you need external mastic in Charing Cross?
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
Any of these means the joints need attention:
- Leaking joints around cladding and façade panels
- Moss and dirt in joints with no sealant left
- Sealant that has lost its bond to the brick or render
- Movement joints with cracked, split or missing sealant
If you live in an older home near St Martin-in-the-Fields, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Comparing quotes
- How the joint is cleaned and prepared
- Whether you can choose the colour
- How hidden problems are handled
- Whether the sealant suits the joint
Can I do it myself?
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Nearby places to Charing Cross
More services for Charing Cross
For landlords and businesses
For anyone letting property in or around Charing Cross, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
Letting agents and landlords in Charing Cross can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
What we do, step by step
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take a few hours for a handful of joints, longer for a whole elevation. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Charing Cross. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Clear the area around the work
- Mention any tricky access
Ask for a quote
There’s no standard price list, because every job is different. Instead, we give you a clear price for your job. To arrange one, call 0345 464 0079 or drop us an email.
Read more
Leave it or put it right?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render around the joint, so the problem grows beyond the joint itself. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Charing Cross, the repair is bigger than a sealant job.
What it costs 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.
Why us?
- Full insurance on every job
- A sealant colour to suit the surroundings
- Homes, businesses and hotels
- Colour agreed with you before any work starts
See our cost guide or what customers say.
What affects the cost of external mastic
We don’t publish a price list, because jobs vary so much. The quote depends on:
- The number of rooms or windows
- Any mould that needs treating
- The old material and how stubborn it is
- The type of sealant required
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we will explain what it covers.
Asking for a quote
Before you ask for a quote, have a think about:
- How many joints, rooms or windows are involved
- The address or postcode of the job
- Whether it’s a home or a business
- Any previous sealing or DIY work
To get a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. We will send you a clear quote before any work starts.
Questions from Charing Cross
I let a flat near London Charing Cross station. Can you help?
Yes, we work for landlords and agents. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear quote.
Is Charing Cross in your area for external mastic?
Yes. Our work covers London and the South East, and Charing Cross is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Can you seal joints between two different materials?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces with primer where required.
What’s an expansion joint in brickwork?
It’s a deliberate gap that lets the wall expand and contract without cracking. It’s sealed with a flexible sealant, not mortar.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
How long does external mastic last?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges.
How much does external mastic cost in Charing Cross?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.