Greater London · England
External & façade joints in Seething Wells, Greater London
Movement joints in Seething Wells need attention? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Rigid filler in a joint that should flex
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
How we handle external mastic in Seething Wells
On houses, flats and commercial buildings across Seething Wells, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. If you have sealant pulling away from one side of the joint and joints pointed up with cement by mistake, we can put it right, whatever the surface.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so one failed joint can cause damp for more than one household. In a converted house in Seething Wells, it’s worth checking who is responsible for the outside before booking.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Seething Wells (KT6, KT1, KT7)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
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 does not work out, we can still put it right.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
How we quote for external mastic
Your quote is based on your job. We look at:
- Whether the work is at height
- Whether there’s mould to deal with
- Any working-time requirements on site
- Which sealant suits the joint
What it costs depends on how much there is to do, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- If someone has resealed it before
- If it’s domestic, commercial or a hotel
- Access, such as stairs, a lift or height
- A few pictures by email, if you can
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
What external mastic looks like in Seething Wells
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. Historic houses like Hampton Court Palace (about 1.3 miles north-west) are a reminder that the area around Seething Wells 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.
If you look after a building such as Maple Infants' School, larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near Surbiton station, split movement joints are easy to miss on a rental until damp shows inside.
Seething Wells is about 4 miles north-west of Ewell, in Greater London. Wherever you are in the KT6 postcode area, our applicators can take on external mastic. Our Greater London coverage runs to 764 places, Seething Wells among them. You can also see our page for London, about 12 miles away.
We work across the KT6, KT1 and KT7 postcode area for external mastic. External mastic is available to properties on Maple Road, Grove Road and North Road. Neighbouring places we cover for external mastic include Surbiton Park (1 mile north-east), Long Ditton (1 mile south), Thames Ditton (1 mile west), Ditton Hill (1 mile south) and Weston Green (1 mile west). Further out, we also cover London (12 miles north-east), City of Westminster (11 miles north-east), Marylebone (11 miles north-east), Kensington (9 miles north-east), St Pancras (12 miles north-east) and Shoreditch (14 miles north-east).
Around Seething Wells
Around Seething Wells, our work takes us to homes and buildings near The Hollyfield School and Sixth Form Centre, The City Arms and Hampton Court Park and the streets around them. Seething Wells has its own railway station: Surbiton station. Nearby you’ll also find Chessington Castle Hill (2.6 miles south) and Metropolitan Police Mounted Branch Museum (1.6 miles west). For a walk, there’s The Wood and Kingston Hill Road area.
Work for landlords, hotels and businesses
For anyone letting property in or around Seething Wells, several properties can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.
Housing providers, facilities teams and property managers book us too in Seething Wells and across Greater London. We can quote a run of properties together.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Loose or hollow render, which needs re-rendering
- Movement that is more than a sealant joint can take
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Joints between brick and frames
- Concrete & block
- Façade panels
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
Different surfaces, different methods
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
Signs you need external mastic in Seething Wells
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
The most common problems we see are:
- Sealant pulling away from one side of the joint
- Plants rooting in failed movement joints
- Leaking joints around cladding and façade panels
- Weathered mastic that no longer stretches
Seething Wells is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before you book
- Whether all the old sealant comes out first
- Whether you can choose the colour
- Who does the work, and how experienced they are
- Is VAT in the price?
What we do, step by step
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a handful of joints, longer for a whole elevation. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us if parking is tricky
- On commercial sites, let us know about site rules
Getting a quote
To get a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
Related advice
Seething Wells questions
Is parking an issue for external mastic in Seething Wells?
Parking in Seething Wells, 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.
I let a flat near Surbiton station. Can you help?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or email us and tell us about the property, and we will give you a clear price.
Can a movement joint be filled with mortar?
No. A mortar-filled joint cannot move, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
When will the joints need doing again?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year and reseal when it splits.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Seething Wells and the rest of Greater London.