Greater London · England
Strawberry Hill External Mastic
Our applicators work in Strawberry Hill on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Failed sealant between panels on a façade
- Sealant pulling away from one side of the joint
- Joints pointed up with cement by mistake
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Look over the joints every year, ideally after winter
- Ask before painting over external sealant
- Tell anyone working on the walls about the movement joints
- Don’t let climbing plants root in the sealant
Don’t let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
External mastic in Strawberry Hill, done properly
For buildings in Strawberry Hill, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. If you have gaps where render, brick and frames meet and rain getting behind render or cladding at a joint, we can put it right, whatever the surface.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in Strawberry Hill, check the lease for who looks after the outside.
Every job is covered by a 12-month guarantee, wherever you are in Greater London.
- Where
- Strawberry Hill (TW1, TW11, TW2)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
DIY sealant or a professional job?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Also near Strawberry Hill
Other services in Strawberry Hill
External mastic in Strawberry Hill: local notes
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. With historic houses such as Strawberry Hill House (about 0.1 miles south-west) nearby, there’s older building stock in the area around Strawberry Hill as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
If you look after a building such as Kneller Hall Senior School, larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near Strawberry Hill station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Strawberry Hill is about 1 mile south of Twickenham, in Greater London. We carry out external mastic for homes and businesses in Strawberry Hill and nearby. Our Greater London coverage runs to 764 places, and Strawberry Hill is one of them. We also work in London, around 11 miles away.
Our applicators cover all of TW1, TW11 and TW2 for external mastic and the streets around it. Local streets include Tower Road, Heath Road and Clive Road, all of which we cover. If you’re just outside Strawberry Hill, we cover Fulwell (1 mile south-west), Eel Pie Island (1 mile north-east), Twickenham (1 mile north), Teddington (1 mile south) and Whitton (1 mile north-west). Within a short drive, we also cover London (11 miles east), City of Westminster (9 miles north-east), Marylebone (10 miles north-east), Kensington (7 miles north-east), St Pancras (11 miles north-east) and Shoreditch (13 miles north-east).
Around Strawberry Hill
We work in homes and buildings around Archdeacon Cambridge's Church of England Primary School, Marble Hill Park and St Richard Reynolds Catholic High School, among other places. There’s a railway station in Strawberry Hill itself: Strawberry Hill station. Nearby you’ll also find Eel Pie Island Museum (0.8 miles north-east) and Bentall Centre (2.2 miles south-east). The countryside around Strawberry Hill includes Kew Gardens Lake and Ham Lands.
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Signs you need external mastic in Strawberry Hill
Sometimes a movement joint was filled with mortar or a rigid filler. The joint cannot move, so the wall cracks somewhere else instead.
People generally contact us when they notice something like this:
- Brick movement joints where the sealant has split
- Cracked joints where brick meets render or frames
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
Strawberry Hill is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Comparing quotes
- Which sealant they’ll use, and why
- Whether all the old sealant comes out first
- Who turns up on the day
- What guarantee comes with the work
Strawberry Hill: your questions answered
Can you help a landlord with a rental near Strawberry Hill station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Is parking an issue for external mastic in Strawberry Hill?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do you seal joints where cladding meets other materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. We choose one that suits both surfaces.
Can you reach joints on upper floors?
That depends on the building and the joints. Where joints can be reached safely, we’ll do them. Give us some details and we’ll confirm the access.
What should I tell you?
The location, the problem and the rough size of the job. If you can, email a few photos.
Is it OK to seal over old sealant?
No, because it fails. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Surface by surface
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.
Copings and trims
Coping and trim joints face rain and sun head on. Each is resealed with a weatherproof, flexible sealant.
What we do, step by step
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for a handful of joints, longer for a whole elevation, and the area is left clean. 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.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Try not to wet indoor joints just before the visit
- Mention any parking rules near the property
- Tell us about any previous sealing or DIY attempts
Ask for a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To arrange one, ring 0345 464 0079 or send us an email.
Advice
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Loose or hollow render, which needs re-rendering
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, phone 0345 464 0079 or email us and we will say what we think.
Surfaces we seal
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Copings & trims