Greater London · England
Norwood Green External Mastic
External mastic in Norwood Green from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Sealant pulling away from one side of the joint
- Water getting into walls through failed joints
- Gaps where render, brick and frames meet
External mastic for homes and businesses in Norwood Green
Short cuts in external joints show up within a season or two. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We strip the joint back and start again. If you have movement joints with cracked, split or missing sealant and weathered mastic that no longer stretches, we can help.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in Norwood Green, check the lease for who looks after the outside.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Norwood Green (UB2, TW5, TW7)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in Norwood Green
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Why Norwood Green clients choose us
- Every job guaranteed for a year
- Approved under the ARBOMaster scheme
- White, clear, grey or coloured to suit, where the product allows
- Tidy, careful work
Take a look at how sealant jobs are priced and customer reviews.
Also near Norwood Green
More services for Norwood Green
How to look after the new joints
Looking after new joints is easy, and it makes a real difference:
- Tell anyone working on the walls about the movement joints
- Keep water from gutters off the wall
- Ask before painting over external sealant
- Avoid pressure-washing directly into sealant joints
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
When to call us in Norwood Green
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
If you can see any of these, it’s time to have the joints looked at:
- Failed seals between different materials
- Water getting into walls through failed joints
- Movement joints with cracked, split or missing sealant
- Rigid filler in a joint that should flex
Norwood Green is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Comparing quotes
- What guarantee comes with the work
- How the joint is cleaned and prepared
- Is the old sealant removed completely?
- How the colour is chosen
Should I try it myself first?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
Outside joints around Norwood Green
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Osterley House (about 0.6 miles south-east) nearby, there’s older building stock in the area around Norwood Green 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.
Letting a property close to Southall station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. For an older house near a landmark such as Church of St Mary, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Norwood Green is about 1 mile south-east of Southall, in Greater London. Our applicators cover external mastic for householders, landlords and businesses in Norwood Green. Our area takes in 764 places across Greater London, large and small. London is on our list too, around 12 miles away.
Work in UB2, TW5 and TW7 works the same way as everywhere else we cover. You will find streets such as Norwood Road, Stour Avenue and Durham Avenue, all of which we cover. With the M4 and A3005 close by, Norwood Green is easy for our applicators to reach for external mastic. Neighbouring places we cover for external mastic include North Hyde (1 mile west), Heston (1 mile south-west), Osterley (1 mile south-east), Spring Grove (1 mile south-east) and Lampton (1 mile south). Within a short drive, we also cover London (12 miles east), City of Westminster (9 miles east), Marylebone (9 miles east), Kensington (7 miles east), St Pancras (11 miles east) and Shoreditch (13 miles east).
Near you in Norwood Green
Typical jobs here are in homes near Inwood Park, The Plough Public House and Heston Community School and the streets around them. The nearest railway station is Southall station, roughly 1 mile north-west of the centre. Other landmarks nearby include St Bernard's Hospital (1 mile north-east) and Museum of Army Music (2.7 miles south). For a walk, there’s Garden Lake and Castlebar Hill.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Your questions about external mastic in Norwood Green
Can you help a landlord with a rental near Southall station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Is parking an issue for external mastic in Norwood Green?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Is the work guaranteed?
Yes. All our work carries a one-year guarantee.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We’ll tell you what we’re using and why.
Do you cover Norwood Green?
Yes, we do. Our applicators work in Norwood Green.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Do I need to be at home?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that generally means someone at home.
Do you remove the old sealant?
Yes, always, and completely. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Honest limits
A few problems are outside what sealant work can do:
- Walls that need new movement joints cut into them
- Render that’s blown, hollow or coming away
- Cracks in the bricks or render themselves, away from the joints
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think.
Joints and surfaces we work on
- Façade panels
- Copings & trims
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
How it works
The work is kept neat and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take a few hours to a few days, depending on the length of joint and the access, and we explain the cure time before we leave. For a job in Norwood Green, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- 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
- Plan for the work area to be out of bounds to pets and children
- Tell us if parking is tricky
- Let us know about stairs, lifts or work at height
Ask for a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will take it from there.