Greater London · England
External Mastic in Putney
External mastic for Putney, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rigid filler in a joint that should flex
- Moss and dirt in joints with no sealant left
- Hard, crazed mastic that has stopped moving
How we handle external mastic in Putney
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a colour to suit. We work on brickwork movement joints, joints between brick and frames and copings & trims, and common reasons people get in touch are moss and dirt in joints with no sealant left and leaking joints around cladding and façade panels.
Outside work in London starts with access: side passages, upper floors and where to park. In Putney, joints up high may need ladders or other access, which is worth talking through when you book.
Your job is guaranteed for a year, as with all our work.
- Where
- Putney (SW15, SW19, SW13)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Walk round the building once a year and look at the joints
- Ask before painting over external sealant
- Make sure movement joints aren’t pointed over
- Do not let climbing plants root in the sealant
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead and let water in behind.
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, all bigger jobs than a reseal.
Also near Putney
More services for Putney
The process
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take a few hours for a handful of joints, longer for a whole elevation. In a London area like Putney, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Mention any tricky access
- Mention any leaks or damp you’ve noticed
- Tell us about any previous sealing or DIY attempts
Get a quote
If you’re in Putney and need external mastic, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Related advice
DIY sealant or a professional job?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
When something else is needed
Before booking, it’s worth knowing the limits too:
- Cracking across the wall rather than at a joint
- Render that is blown, hollow or coming away
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before you book.
Where we work in Putney
- Copings & trims
- Joints between brick and frames
- Façade panels
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
External mastic in Putney: local notes
Historic houses like Fulham Palace (about 0.6 miles north-east) are a reminder that the area around Putney has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Putney station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Putney is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Putney is about 1 mile south-west of Fulham, in Greater London. If you need external mastic in Putney, please ring 0345 464 0079 or email us for a quick quote. We’re based in Crawley and cover Greater London, Putney included. Putney is one of 764 towns and villages in Greater London we cover for external mastic. For nearby work, see our London page (6 miles or so).
We cover every part of SW15, SW19 and SW13 for external mastic. We cover properties on Putney High Street, Upper Richmond Road and Spencer Walk. Main roads around Putney include the A3 and B306, which makes travel easy. If you are just outside Putney, we cover Roehampton (1 mile south-west), Barnes (1 mile north-west), Fulham (1 mile north-east), Mortlake (2 miles west) and Wimbledon Park (2 miles south). We also work in nearby towns such as London (6 miles north-east), City of Westminster (5 miles north-east), Marylebone (5 miles north-east), Kensington (3 miles north), St Pancras (6 miles north-east) and Shoreditch (8 miles north-east).
Landmarks near Putney
We work in homes and buildings around Putney School of Art and Design, Bishops Park and The Railway pub, among other places. Putney has its own railway station: Putney station. Other landmarks nearby include Putney Exchange (under half a mile east) and Antique Breadboard Museum (less than half a mile north-east). Open spaces near Putney include Henman Hill and Battersea Park Lake.
For landlords and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.
We work for landlords and agents as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
Common questions in Putney
Is parking an issue for external mastic in Putney?
Parking in Putney, 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 help a landlord with a rental near Putney station?
Yes, we work for landlords and letting agents. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before work begins.
What sealant do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Can you match the colour of my brickwork?
We choose a sealant colour to suit the brick, stone or render, so the joint sits quietly in the wall. There’s a wide choice of exterior colours.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Do you use backing rod?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only, which would stop it stretching.
Are you fully insured?
Yes. Mr Mastic is fully insured.
What happens if it’s left?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in Putney.
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or send us an email and we’ll talk you through it.
Why book with us
- Domestic, commercial and hotel work
- Tidy, careful work
- Anti-fungal sanitary silicone in wet areas
- We agree the colour with you first
See our cost guide or customer reviews.
Signs you need external mastic in Putney
Sometimes a movement joint was filled with mortar or a rigid filler, often by someone who didn’t know what it was for. The joint can’t move, so the wall cracks somewhere else instead.
Common reasons people contact us are:
- Rain getting behind render or cladding at a joint
- Joints with sealant missing in places
- Failed seals between different materials
- Joints pointed up with cement by mistake
Homes close to Polish Church of St John the Evangelist include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
What your quote should include
- How the colour is chosen
- Who turns up on the day
- What the quote includes, VAT included or not
- How long the guarantee is