Greater London · England
External Mastic in Upminster
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Upminster. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Joints with sealant missing in places
- Failed seals between different materials
- Panel joints letting water in
Aftercare tips
Aftercare is simple:
- Have failed joints looked at early
- Leave the joints unpainted unless we have said otherwise
- Don’t let climbing plants root in the sealant
- Keep movement joints as flexible joints, not mortar
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
External mastic for homes and businesses in Upminster
On houses, flats and commercial buildings across Upminster, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean joint faces and the right depth. If you are dealing with old sealant gone brittle and cracked and damp patches traced to an open external joint, we can help, whatever the surface.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. In a converted house in Upminster, it’s worth checking who is responsible for the outside before booking.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or email us.
- Place
- Upminster (RM14, RM11)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Places near Upminster
What else we do in Upminster
Different surfaces, different methods
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one before the bead.
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.
What sealant work can’t fix
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Failed render or damaged cladding panels
- Cracks in the bricks or render themselves, away from the joints
- Subsidence or other structural problems
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before you book.
What we seal
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Façade panels
- Brickwork movement joints
- Copings & trims
Upminster questions
Can you do external mastic in Upminster?
Yes, Upminster is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing.
I let a flat near Upminster station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
How long does external mastic last?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Our work comes with a one-year guarantee.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We will give you the cure time for the product we used.
Can you match the colour of my brickwork?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin.
Do you take out the old sealant first?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Do I need to be at home?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Do you have insurance?
Yes. We are fully insured.
What external mastic looks like in Upminster
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Hare Hall (about 2.6 miles north-west) nearby, there’s older building stock in the area around Upminster 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 look after a building such as Upminster Junior School, larger buildings have long runs of movement joint that eventually need resealing. Upminster is in London, so parking needs planning: let us know about parking bays, permits or a driveway. If you let a flat or house near Upminster station, split movement joints are easy to miss on a rental until damp shows inside.
Upminster is about 2 miles east of Hornchurch, in Greater London. If you need external mastic in Upminster, please call 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base. Upminster is one of 764 towns and villages in Greater London we cover for external mastic. There’s also a page for London, roughly 16 miles from Upminster.
We work across RM14 and RM11 for external mastic. If you need external mastic at a property on Station Road, Latham Place and Deyncourt Gardens or a nearby road, our applicators can take on the job. Close by, we work in Upminster Bridge (1 mile west), Cranham (1 mile east), Emerson Park (1 mile north-west), Hornchurch (2 miles west) and Puddle Dock (2 miles east). Larger places within reach include Shoreditch (14 miles west), Walthamstow (12 miles west), Hoxton (15 miles west), Whitechapel (14 miles west), Orpington (14 miles south-west) and Highbury (15 miles west).
Landmarks near Upminster
Around Upminster, our work takes us to homes and buildings near Eastbrook School, St. Andrew's Park and The Crumpled Horn pub and the streets around them. Upminster has its own railway station: Upminster station. Well-known places in the area include Upminster Tithe Barn Museum of Nostalgia (0.5 miles north) and The Mercury Mall (3.2 miles north-west). For a walk, there’s Cranham Marsh.
How we quote for external mastic
You’ll get a clear quote before we start. It’s based on:
- The size of the job
- How many rooms, windows or areas are involved
- Whether old sealant or filler has to be cut out
- How easy the joints are to reach
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
What we need to know
When you contact us, it’s useful to know:
- Roughly how big the job is
- The problem you’ve noticed
- The type of property
- Where the job is, and your postcode
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll come back to you with a quote.
How it works
We keep the work tidy and contained to the area we’re working on. The job generally takes anything from a few hours to several days, depending on the building. In a London area like Upminster, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
Getting a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work.
Related advice
Landlords, agents and businesses in Upminster
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
If you are 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 fails, we can still redo it.