Greater London · England
Hillingdon External Mastic
Movement joints in Hillingdon need attention? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Old sealant gone brittle and cracked
- Weeds or debris growing in open joints
- Movement joints filled with mortar instead of sealant
Hillingdon buildings and the weather
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. Historic houses like Ickenham Hall (about 1.8 miles north) are a reminder that the area around Hillingdon has older buildings as well as new. 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 Abbotsfield School for Boys, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to Church of St John include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Hillingdon is about 2 miles north-west of Hayes, in Greater London. Homes, rented property, offices and hotels in Hillingdon can book us for external mastic. Every job comes with our one-year guarantee. Across Greater London, we cover 764 places, Hillingdon among them. We also work in London, about 15 miles from Hillingdon.
We work across the UB10, UB8, UB9 and HA4 postcode area for external mastic and the streets around it. Local streets include The Larches, Brampton Road and Clifton Gardens, all of which we cover. You’ll find Hillingdon on the B465 and B467, so it’s easy for us to get to. Other places close to Hillingdon include Uxbridge (1 mile west), Ickenham (1 mile north), Cowley (2 miles south-west), Yiewsley (2 miles south-west) and Hayes (2 miles south-east). We also work in nearby towns such as London (15 miles east), City of Westminster (13 miles east), Marylebone (13 miles east), Kensington (11 miles east), St Pancras (14 miles east) and Hampstead (12 miles east).
Near you in Hillingdon
We work in homes and buildings around Highfield Primary School, Norman Leddy Memorial Gardens and Oak Wood School and the streets around them. Hillingdon’s nearest station is West Drayton station, roughly 2.2 miles south-west. Nearby you’ll also find Hillingdon Museum and Archives Services (1.4 miles north-west) and Hillingdon Hospital (1 mile south-west). For a walk, there’s Northala Fields and Gutteridge Wood and Meadows.
How we handle external mastic in Hillingdon
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. Common call-outs are for rigid filler in a joint that should flex and weathered mastic that no longer stretches, on brickwork movement joints, copings & trims and render & cladding joints.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Hillingdon, tell us how high the joints are and how to reach the back of the building.
All our work is covered by our one-year guarantee.
- Where
- Hillingdon (UB10, UB8, UB9, HA4)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the cost of external mastic
Every job gets its own quote. These are the things that affect it:
- How much there is to do
- Whether there’s mould to deal with
- Access and height
- How much old sealant there is and how hard it is to remove
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The problem you’ve noticed
- Pictures of the joints, sent by email
- If someone has resealed it before
- Whether it’s a home or a business
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.
Honest limits
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Adding movement joints to masonry that has none
- Movement that is more than a sealant joint can take
- Damp that isn’t coming from the joint
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before you book.
What we seal
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Façade panels
Keeping the joints in good condition
So the new joints stay in good condition:
- Show decorators and builders where the movement joints are
- Wash walls gently around the sealant
- Leave the joints unpainted unless we have said otherwise
- Clear growth from the base of walls and joints
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
Hillingdon: your questions answered
Is parking an issue for external mastic in Hillingdon?
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.
Do you work for landlords with property near West Drayton station?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
Is there any odour?
There can be a smell while the sealant cures. Ventilation helps.
Will it make a mess?
No. The area is protected while we work and cleaned up afterwards.
What’s an expansion joint in brickwork?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
How long does external mastic last?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Every job carries our 12-month guarantee.
Is there a guarantee?
Yes, always. There’s a 12-month guarantee on every job, large or small.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Why deal with it now?
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before any work starts, so you know where you stand.
Why us?
- White, clear, grey or coloured to suit, where the product allows
- Fully insured
- Any old sealant cut out fully, not covered over
- More than 20 years in sealant work
Take a look at what affects the cost and what customers say.
Landlords, agents and businesses in Hillingdon
We also work for property managers and facilities teams. We can quote a run of properties together, and we are fully insured.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
What happens on the day
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours to a few days, depending on the length of joint and the access. In a London area like Hillingdon, 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 we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
How to get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
More services for Hillingdon
Signs you need external mastic in Hillingdon
If plants are growing out of a joint, the sealant has usually failed or was never there. Dirt and roots then trap moisture in the joint and make things worse.
Signs it’s time to call us include:
- Joints with sealant missing in places
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
- Sealant pulling away from one side of the joint
Hillingdon is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Questions to ask before you book
- Whether they seal over old material or remove it
- How hidden problems are handled
- How the joint is cleaned and prepared
- How long to leave it before use