Greater London · England
External & façade joints in Upton, Greater London
External mastic for Upton, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rain getting behind render or cladding at a joint
- Brick movement joints where the sealant has split
- Failed seals between different materials
External mastic in Upton: local notes
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Red House (about 0.3 miles south-west) nearby, there’s older building stock in the area around Upton as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
If you let a flat or house near Bexleyheath station, outside joints that have cracked can let damp into a rental, so check them between lets. In the older streets around Trinity Baptist Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Upton is about 1 mile east of Welling, in Greater London. We provide external mastic to homes and businesses in Upton, as part of our work across Greater London. Across Greater London, we cover 764 places, and Upton is one of them. Our London page covers work nearby.
Here we cover the DA6, DA7 and DA16 postcode area for external mastic. Whether your property is on Lion Road, Upton Road and Freta Road or a nearby road, our applicators can take on the job. Nearby, we also carry out external mastic in Bexleyheath (1 mile east), Crook Log (1 mile west), Blendon (1 mile south-west), Bexley (1 mile south) and Welling (1 mile west). Larger places within reach include London (10 miles west), City of Westminster (13 miles west), Marylebone (13 miles west), Kensington (15 miles west), St Pancras (12 miles north-west) and Shoreditch (10 miles north-west).
Near you in Upton
Locally, jobs take us to homes and businesses close to St Catherine's Catholic School, Danson Park and Bexleyheath Academy and the streets around them. There’s a railway station in Upton itself: Bexleyheath station. Well-known places in the area include Bexley Hospital (within half a mile south-west) and Broadway Shopping Centre (0.5 miles south-east). For a walk, there’s Summer Hill and Wansunt Pit.
External mastic for homes and businesses in Upton
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two. Typical jobs include leaking joints around cladding and façade panels and movement joints filled with mortar instead of sealant, on copings & trims, joints between brick and frames and façade panels.
Modern London flats rely on sealed movement joints and cladding joints. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall.
We stand behind the work with a 12-month guarantee.
- Place
- Upton (DA6, DA7, DA16)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Honest limits
We won’t take on work that will not last, so here’s what sealant can’t put right:
- Cracking across the wall rather than at a joint
- Movement that’s more than a sealant joint can take
- Rising or penetrating damp from elsewhere in the wall
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think.
Joints and surfaces we work on
- Concrete & block
- Render & cladding joints
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
What happens on the day
We bring everything the job needs with us, so there’s nothing for you to buy. Once we have agreed what’s being done, we protect the area and start. Most jobs take anything from a few hours to several days, depending on the building. In Upton, 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 inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any parking rules near the property
Get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we will explain what’s involved and send you a clear quote.
Related advice
Quotes for external mastic in Upton
For a quick quote, just ask. What matters most is:
- Mould in or behind the old joints
- How many rooms, windows or areas are involved
- The number and length of the joints
- How easy the joints are to reach
Leaving a failed joint generally makes the job bigger, not smaller. If you are unsure, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
Asking for a quote
To make quoting easier, let us know:
- The rough size of the job
- Where the property is
- Any access issues, like height or stairs
- The problem you’ve noticed
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, ring 0345 464 0079 or send us an email.
Questions from Upton
Is parking an issue for external mastic in Upton?
Parking in Upton, 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.
Is Upton in your area for external mastic?
Yes. We work across London and the South East, and Upton is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we will give you a clear quote.
What information do you need?
Let us know what needs doing and where, with pictures by email if possible. If we need more, we’ll ask.
How long does external mastic last?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Every job carries our 12-month guarantee.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Can you match the colour of my brickwork?
The aim is a neat, even joint in a colour that suits the wall. We will talk through colour options before work begins, matched as closely as the range allows.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned.
I rent my home. Can I book you?
We’re happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
Towns and villages near Upton
Other services in Upton
Signs you need external mastic in Upton
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.
Any of these means the joints need attention:
- Moss and dirt in joints with no sealant left
- Old sealant gone brittle and cracked
- Sealant pulling away from one side of the joint
- Failed sealant between panels on a façade
Schools such as Upland Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What your quote should include
- Who turns up on the day
- What product goes in the joint
- How the joint is cleaned and prepared
- Is VAT in the price?
What the job involves on each surface
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. We prime where the sealant needs it before sealing.
Leave it or put it right?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Upton, the repair is bigger than a sealant job.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
Why book with us
- Full insurance on every job
- Domestic, commercial and hotel work
- A choice of colours where the product allows
- An ARBOMaster approved applicator
Take a look at how sealant jobs are priced and what customers say.
DIY sealant or a professional job?
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.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.