Greater London · England
Perivale External Mastic
Professional external mastic in and around Perivale, with old sealant always removed completely.
- Sealant pulling away from one side of the joint
- Panel joints letting water in
- Movement joints with cracked, split or missing sealant
Quotes for external mastic in Perivale
You’ll get a clear quote before we start. It’s based on:
- The old material and how stubborn it is
- When we can work, for business premises
- Which sealant suits the joint
- The number of rooms or windows
Combining jobs into one visit usually makes better use of the time than several visits. We’ll give you a clear price for the lot.
What we need to know
What to tell us when you ask for a quote:
- What the problem is, such as mould, gaps, leaks or cracking
- How we’d reach the joints
- Where the job is, and your postcode
- If someone has resealed it before
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
How we handle external mastic in Perivale
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing, and we don’t skip that step. We’re often asked to deal with moss and dirt in joints with no sealant left and panel joints letting water in, across concrete & block, joints between brick and frames and copings & trims.
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. In a converted house in Perivale, it’s worth checking who is responsible for the outside before booking.
There’s a 12-month guarantee on every job, large or small.
- Location
- Perivale (UB6, HA0, W5)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Keeping the joints in good condition
Aftercare is simple:
- Keep soil, plants and ivy away from the joints
- Avoid pressure-washing directly into sealant joints
- Look over the joints every year, ideally after winter
- Check the sealant is paintable before painting near it
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead and let water in behind.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Your questions about external mastic in Perivale
Do you work for landlords with property near South Greenford station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Do you cover Perivale for external mastic?
Yes, Perivale is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Will the old sealant be removed?
Yes, every time. New sealant won’t bond properly to old, so the joint is cleaned back first.
What does external mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you when we finish.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
What sealant work cannot fix
We’ll always be straight with you, so here’s what new sealant will not do:
- Movement that’s more than a sealant joint can take
- Failed render or damaged cladding panels
- Damp that isn’t coming from the joint
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before booking.
Where we work in Perivale
- Joints between brick and frames
- Copings & trims
- Façade panels
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
Places near Perivale
More services for Perivale
Why act early in Perivale
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together, and access only has to be arranged once. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Perivale, the repair is bigger than the sealant job would have been.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are unsure, ring 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why us?
- We leave the area clean and tidy
- A choice of colours where the product allows
- Arbo and Everbuild products
- Experience in homes, commercial sites and hotels
Take a look at how sealant jobs are priced or customer reviews.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
When to call us in Perivale
Sometimes a movement joint was filled with mortar or a rigid filler. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
The problems people generally mention when they call include:
- Plants rooting in failed movement joints
- Joints where the bead has come unstuck
- Leaking joints around cladding and façade panels
- Failed seals between different materials
If you live in an older home near St. Mary with St. Nicholas - Perivale, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Questions to ask before booking
- How the colour is chosen
- What happens if they find a problem under the old sealant
- What the quote includes, VAT included or not
- What preparation is included
Outside joints around Perivale
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Pitzhanger Manor (about 2 miles south) are a reminder that the area around Perivale 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.
Letting a property close to South Greenford station? Then outside joints that have cracked can let damp into a rental, so check them between lets. As a London address, Perivale can be tricky for parking: let us know about parking bays, permits or a driveway.
Perivale is about 1 mile east of Greenford, in Greater London. Whether you’re in the middle of Perivale or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Perivale is one of 764 places in Greater London where we work for external mastic. You can also see our page for London, about 10 miles away.
Our applicators cover all of UB6, HA0 and W5 for external mastic and the streets around it. Whether your property is on Lee Road, Wicket Road and Bilton Road or a nearby road, we can help. Neighbouring places we cover for external mastic include Pitshanger (1 mile south), Brentham Garden Suburb (1 mile south-east), Sudbury Hill (1 mile north), Sudbury (1 mile north) and Greenford (1 mile west). Further out, we also cover London (10 miles east), City of Westminster (7 miles east), Marylebone (8 miles east), Kensington (6 miles south-east), St Pancras (9 miles east) and Shoreditch (10 miles east).
Landmarks near Perivale
Locally, jobs take us to homes and businesses close to Alperton Community School, Castle Bar Park and Brentham Clubhouse pub. For rail, the closest station is South Greenford station, about 0.8 miles south-west. Nearby you’ll also find London Transport Museum Depot (2.8 miles south-east) and London Designer Outlet (1.9 miles north-east). Open spaces near Perivale include Middle Lake and Castlebar Hill.
How it works
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself generally takes a few hours to a few days, depending on the length of joint and the access, depending on how much there is to do. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Perivale. A visitor permit or a nearby bay makes the visit run more smoothly.
- 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.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Let us know about earlier repairs to the joints
- Mention any sign-in or site rules at work premises
Ask for a quote
To get a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before any work starts.