Greater London · England
External Mastic in Falconwood
Sealing brickwork movement joints, render, cladding and façade joints for Falconwood, backed by a one-year guarantee. Ask us for a quote.
- Old sealant gone brittle and cracked
- Movement joints with cracked, split or missing sealant
- Panel joints letting water in
What happens on the day
When we arrive, we look over the joints with you first, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. In Falconwood, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We start by walking round the building and agreeing the joints and the access.
- 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.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any previous sealing or DIY attempts
- Mention any sign-in or site rules at work premises
Ask for a quote
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or drop us an email.
Read more
External mastic for homes and businesses in Falconwood
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant. If you have weathered mastic that no longer stretches and rigid filler in a joint that should flex, we can help, whatever the surface.
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. For a flat in Falconwood, check the lease for who looks after the outside.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Falconwood (DA16, DA15, SE9)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Honest limits
It helps to know what we can’t do:
- Cracked brickwork or render that needs a builder or plasterer
- Damp that isn’t coming from the joint
- Failed render or damaged cladding panels
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before booking.
Where we work in Falconwood
- Joints between brick and frames
- Copings & trims
- Concrete & block
- Façade panels
- Render & cladding joints
- Brickwork movement joints
Quotes for external mastic in Falconwood
We don’t publish a price list, because jobs vary so much. What we look at:
- When we can work, for business premises
- Whether old sealant or filler has to be cut out
- How many areas need sealing
- Any mould that needs treating
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before work begins, so you know where you stand.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Photos by email, if that is easy
- The type of property
- How we’d reach the joints
- Any previous sealing or DIY work
We quote each job on its own, so the first step is telling us about yours. Just phone 0345 464 0079 or drop us an email with the details, and photos are welcome.
DIY versus a professional finish
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
FAQs for Falconwood
Can parking be tricky for a visit in Falconwood?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Is Falconwood in your area for external mastic?
Yes, Falconwood is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing.
Do you work at height?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher work, tell us about the building and we’ll confirm what’s needed.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
Can you seal over the old sealant?
No, it will not last. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
Why do you put foam in the joint first?
Backing rod goes into deeper joints as a matter of course. It sets the sealant depth and prevents three-sided bonding so the bead can stretch.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint.
How the job changes by surface
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so its sealant has to stay flexible.
Landlords, agents and businesses in Falconwood
For anyone letting property in or around Falconwood, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Towns and villages near Falconwood
Other services in Falconwood
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last so it’s worth doing right. 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. Putting it right early is much less trouble.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why us?
- 180+ five-star Google reviews
- We never seal over old sealant
- White, clear, grey or coloured to suit, where the product allows
- Homes, businesses and hotels
Take a look at what affects the cost and customer reviews.
Walls and rooflines in Falconwood
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Danson House (about 1 mile east) nearby, there’s older building stock in the area around Falconwood as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Falconwood is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you let a flat or house near Welling station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Bishop Ridley Church include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Falconwood is about 2 miles north-east of Eltham, in Greater London. Falconwood gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Falconwood is one of 764 towns and villages in Greater London we cover. We also work in London, about 9 miles from Falconwood.
Every address in DA16, DA15 and SE9 is covered for external mastic, from the main roads to the quietest streets. Local streets include Hook Lane, Gordon Road and Kent Avenue, and we cover them all. Nearby, we also carry out external mastic in Blackfen (1 mile south), East Wickham (1 mile north), Avery Hill (1 mile south-west), Shooter's Hill (1 mile north-west) and New Eltham (2 miles south-west). Within a short drive, we also cover London (9 miles west), City of Westminster (11 miles west), Marylebone (11 miles west), Kensington (13 miles west), St Pancras (10 miles north-west) and Shoreditch (9 miles north-west).
Around Falconwood
We work in homes and buildings around The Plough and Harrow pub, Shoulder of Mutton Green and Harris Academy Falconwood. The closest station to Falconwood is Welling station, about 0.5 miles north-east of the centre. Other landmarks nearby include Broadway Shopping Centre (2.2 miles east) and Memorial Hospital (1.4 miles north-west). For a walk, there’s The Tarn and Summer Hill.