Greater London · England
External Mastic in Covent Garden
External mastic for Covent Garden and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Rain getting behind render or cladding at a joint
- Joints where the bead has come unstuck
- Weathered mastic that no longer stretches
The process
There is not much for you to do on the day. Show us the job and we’ll take it from there. The job generally takes anything from a few hours to several days, depending on the building, including the tidy-up. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Covent Garden. A visitor permit or a nearby bay makes the visit run more smoothly.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Clear items away from the joints we’re working on
- Keep pets and children clear of the area while we work
Ask for a quote
Need a quote? Please ring 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and send you a clear quote before any work starts.
Related advice
External mastic in Covent Garden
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where mortar or filler would crack. Common call-outs are for panel joints letting water in and failed seals between different materials, on render & cladding joints, concrete & block and brickwork movement joints.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall, and both kinds of building are found across London.
All our work comes with our one-year guarantee, wherever you are in Greater London.
- Location
- Covent Garden (W1F, W1D, W1T)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Also near Covent Garden
What else we do in Covent Garden
What affects the quote in Covent Garden
For a quick quote, just ask. What matters most is:
- How many rooms, windows or areas are involved
- Any working-time requirements on site
- Whether the work is at height
- The number and length of the joints
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
- Where the job is, and your postcode
- How we’d reach the joints
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you are ready, call 0345 464 0079 or email us.
What external mastic looks like in Covent Garden
Historic houses like Benjamin Franklin House (about 0.4 miles south) are a reminder that the area around Covent Garden has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking.
For site and facilities teams at buildings such as St Clement Danes CofE Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. If you live in an older home near Crown Court Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Covent Garden is about 1 mile east of City of Westminster, in Greater London. Every kind of property in Covent Garden can book us for external mastic, old or new, large or small. The work is guaranteed for a year. We cover 764 towns and villages across Greater London, large and small.
We cover every part of W1F, W1D and W1T for external mastic. Whether your property is on Duck Lane, Drury Lane and New Square or anywhere close by, our applicators can take on the job. Main roads around Covent Garden include the A301 and A400, which makes travel easy. We also cover the places around Covent Garden: Seven Dials (1 mile west), Aldwych (1 mile east), Adelphi (1 mile south), St Giles (1 mile north-west) and Clare Market (1 mile north-east). Within a short drive, we also cover Kensington (4 miles west), Walthamstow (7 miles north-east), Hampstead (4 miles north-west), Ruislip (13 miles west), Stockwell (3 miles south) and Orpington (13 miles south-east).
Around Covent Garden
We work in homes and buildings around Victoria Embankment Gardens, London Nautical School and Mercers' School. Other local landmarks include Punch & Judy pub (under half a mile south-west) and LSE Shaw Library (within half a mile north-east). Covent Garden has its own railway station: London Charing Cross station. Nearby you’ll also find Montfichet's Tower (0.9 miles east) and Savoy Hospital (within half a mile south-east). For a walk, there’s Ludgate Hill and Barnsbury Wood.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Never let anyone fill a movement joint with mortar
- Leave the joints unpainted unless we have said otherwise
- Look over the joints every year, ideally after winter
- Show decorators and builders where the movement joints are
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
What happens if it’s left?
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler for homes in Covent Garden.
The cost reflects the work involved, not guesswork. That is why we ask about the job first and send you a clear quote before we start.
Why book with us
- Homes, businesses and hotels
- Anti-fungal sanitary silicone in wet areas
- A 12-month guarantee on all work
- 180+ five-star Google reviews
Take a look at how sealant jobs are priced or customer reviews.
Questions from Covent Garden
Is parking a problem for a job in Covent Garden?
Parking in Covent Garden, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Can you do external mastic in Covent Garden?
Yes. Our work covers London and the South East, and Covent Garden is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
Can you seal joints between render and window frames?
Yes. Joints between dissimilar materials are a big part of external work. We use a flexible sealant suited to both surfaces, primed where needed.
Is there a guarantee?
Yes. Every job comes with a 12-month guarantee.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses and we are fully insured.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Do the sealants smell?
That depends on the sealant. Some smell for a while, some hardly at all.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. We will talk through colour options before any work starts, matched as closely as the range allows.
Common problems we fix in Covent Garden
Using the wrong sealant is another common reason. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
People generally contact us after spotting one of these:
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
- Leaking joints around cladding and façade panels
- Old sealant gone brittle and cracked
As a London address, Covent Garden can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
What to look for in a quote
- What the cure time is
- Whether they’re fully insured
- What product goes in the joint
- Whether you can choose the colour
Surface by surface
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so the movement is taken up.
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.