Greater London · England
External & façade joints in Mortlake, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for Mortlake, backed by a one-year guarantee. Call for a quick quote.
- Rain getting behind render or cladding at a joint
- Plants rooting in failed movement joints
- Movement joints filled with mortar instead of sealant
External mastic in Mortlake
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 in a matching colour. We work on render & cladding joints, brickwork movement joints and concrete & block, and common reasons people get in touch are plants rooting in failed movement joints and gaps where render, brick and frames meet.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. In Mortlake, joints up high may need ladders or other access, which is worth talking through when you book.
We stand behind the work with a one-year guarantee.
- Location
- Mortlake (SW14, SW13, SW15)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What happens on the day
We keep the work tidy and contained to the area we’re working on, so you can carry on as normal. Expect the work to take a few hours to a few days, depending on the length of joint and the access, and we explain the cure time before we leave. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Mortlake. It helps if you can point us to a visitor permit or a bay close to the door.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Clear the area around the work
- Mention any tricky access
- Try not to wet indoor joints just before the visit
Ask for a quote
Every job is quoted individually. Simply call 0345 464 0079 or email us and describe the job, and photos are welcome.
Advice
Landlords, agents and businesses in Mortlake
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Surface by surface
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.
Cladding and façade panels
Panels heat up and cool down quickly, so the joint sealant has to cope with frequent movement. We choose the product to suit.
Nearby places to Mortlake
What else we do in Mortlake
Mortlake questions
Do you work for landlords with property near Mortlake station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or send us an email and tell us about the property, and we’ll send you a clear quote.
Is parking a problem for a job in Mortlake?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Will it make a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
What is a movement joint?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
Will the new joint stand out?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin from the range available.
How often do external joints need resealing?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away, and reseal at that point.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us and we are fully insured.
Do you need external mastic in Mortlake?
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
The problems people generally mention when they call include:
- Rigid filler in a joint that should flex
- Sealant pulling away from one side of the joint
- Movement joints with cracked, split or missing sealant
- Weeds or debris growing in open joints
If you look after a building such as Thomson House School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before you book
- What insurance they hold
- Whether all the old sealant comes out first
- Whether you can choose the colour
- How the joint is cleaned and prepared
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Honest limits
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- Rising or penetrating damp from elsewhere in the wall
- Subsidence or other structural problems
- Cracked brickwork or render that needs a builder or plasterer
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before you book.
Joints and surfaces we work on
- Render & cladding joints
- Concrete & block
- Façade panels
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The type of sealant required
- Whether the work is at height
- Whether there’s mould to deal with
- When we can work, for business premises
Doing several joints on one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- If someone has resealed it before
- Pictures of the joints, sent by email
- Where the property is
- The problem you’ve noticed
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we will talk you through the work before giving you a price.
Outside joints around Mortlake
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. Historic houses like Chiswick House (about 1.3 miles north) are a reminder that the area around Mortlake has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
In the older streets around All Saints' Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Letting a property close to Mortlake station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Mortlake is about 3 miles west of Fulham, in Greater London. From the centre of Mortlake to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Mortlake is one of 764 towns and villages in Greater London where we work. We also work in London, about 8 miles from Mortlake.
Every address in SW14, SW13 and SW15 is within our area for external mastic. Local streets include Elm Road, Well Lane and Coval Road. With the A3003 close by, Mortlake is easy for our applicators to reach. Nearby, we also carry out external mastic in East Sheen (1 mile south-west), North Sheen (1 mile north-west), Barnes (1 mile north-east), Grove Park (1 mile north) and Roehampton (1 mile south-east). Further out, we also cover London (8 miles east), City of Westminster (6 miles north-east), Marylebone (6 miles north-east), Kensington (4 miles north-east), St Pancras (8 miles north-east) and Shoreditch (9 miles north-east).
Local landmarks in Mortlake
We work in homes and buildings around Richmond Park Academy, Hare and Hounds pub and Palewell Park. There’s a railway station in Mortlake itself: Mortlake station. Well-known places in the area include Ubuntu Museum: African Museum of Humanity (1.1 miles south-east) and Barnes Hospital (less than half a mile east). The countryside around Mortlake includes Richmond Hill and Kew Gardens Lake.