Greater London · England
External & façade joints in Nine Elms, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for Nine Elms, backed by a one-year guarantee. Call for a quick quote.
- Failed seals between different materials
- Brick movement joints where the sealant has split
- Sealant pulling away from one side of the joint
Questions from Nine Elms
I let a flat near Battersea Park station. Can you help?
Yes. We work for letting agents and landlords as well as householders. You can call 0345 464 0079 or email us with the details for a clear quote.
Can parking be tricky for a visit in Nine Elms?
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.
Why do you put foam in the joint first?
That’s backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only.
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.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
How often do external joints need resealing?
It depends on the exposure, the movement and the product. Sealant is a maintenance item, so check the joints once a year and reseal when it splits.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us and we are fully insured.
External mastic in Nine Elms, done properly
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall so the line blends in. Common call-outs are for water getting into walls through failed joints and joints with sealant missing in places, across joints between brick and frames, brickwork movement joints and concrete & block.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Nine Elms, tell us how high the joints are and how to reach the back of the building.
All our work is covered by a 12-month guarantee, wherever you are in Greater London.
- Location
- Nine Elms (SW1V, SW8, SW11)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Nine Elms
Also in Nine Elms
Honest limits
To be straight with you, there are a few things sealant will not fix:
- Failed render or damaged cladding panels
- Structural movement, which needs a surveyor or engineer
- Cracking across the wall rather than at a joint
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before booking.
Joints and surfaces we work on
- Copings & trims
- Concrete & block
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Joints between brick and frames
What affects the quote in Nine Elms
Every job gets its own quote. This is what makes a difference:
- When we can work, for business premises
- The type of sealant required
- The amount of work
- Whether the work is at height
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
What we need to know
Photos help, but a description is a good start. Please mention:
- The rough size of the job
- The type of property
- The address or postcode of the job
- The problem you’ve noticed
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll explain what’s involved.
Nine Elms buildings and the weather
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. With historic houses such as Carlyle's House (about 1.1 miles west) nearby, there’s older building stock in the area around Nine Elms as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
If you let a flat or house near Battersea Park station, outside joints that have cracked can let damp into a rental, so check them between lets. Homes close to All Saints include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Nine Elms is about 1 mile south of Victoria, in Greater London. If you need external mastic in Nine Elms, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We cover Greater London from our Crawley base. 764 places in Greater London are on our list, large and small.
Work in SW1V, SW8 and SW11 works the same way as everywhere else we cover. You’ll find streets such as Cupar Road, Ponton Road and Macduff Road, and we cover them all. Nine Elms sits on or near the A3212 and A3216, which makes travel easy. We also cover the places around Nine Elms: Pimlico (1 mile north-east), Victoria (1 mile north), South Lambeth (1 mile east), Chelsea (1 mile north-west) and Kennington (1 mile east). Within a short drive, we also cover Kensington (3 miles north-west), St Pancras (3 miles north), Shoreditch (4 miles north-east), Walthamstow (9 miles north-east), Hoxton (4 miles north-east) and Whitechapel (4 miles north-east).
Landmarks near Nine Elms
We work in homes and buildings around Pimlico Academy, Sir Simon Milton Westminster UTC and Lambeth Palace Library. Nearby too are Pimlico Gardens (0.5 miles north-east) and The King William IV pub (under half a mile north-east). Nine Elms has its own railway station: Battersea Park station. Well-known places in the area include Harrods (1.5 miles north-west) and Royal Hospital Chelsea (0.7 miles north-west). Green spaces nearby include Battersea Park Lake and Campden Hill.
The process
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from a few hours to several days, depending on the building, and the area is left clean. In Nine Elms, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Try not to wet indoor joints just before the visit
- Let us know about parking restrictions
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Related advice
Landlord and commercial work in Nine Elms
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
We also work for property managers and facilities teams in Nine Elms and across Greater London. Several sites can go on one quote, and we’re fully insured.
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 fails, we can still redo it.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Why act early in Nine Elms
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. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Nine Elms, the repair is bigger than the sealant job would have been.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Why choose Mr Mastic in Nine Elms
- ARBOMaster approved applicator
- 4.9 on Google from 180+ five-star reviews
- You choose the colour before work begins
- Any old sealant cut out fully, not covered over
Common problems we fix in Nine Elms
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
Keep an eye out for any of the following:
- Moss and dirt in joints with no sealant left
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
- Joints where the bead has come unstuck
Nine Elms is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What your quote should include
- What happens if they find a problem under the old sealant
- How much experience the applicator has
- Is the old sealant removed completely?
- Whether VAT is included