Greater London · England
Hillingdon New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes in Hillingdon, with a one-year guarantee on every job. Ask us for a quote.
- Shower seals failing in the first year or two
- Untidy sealant flagged on a snagging list
- Skirting joints opening in the first winter
Aftercare tips
Good habits help new joints last longer. Our tips:
- Avoid running a DIY bead over the old one
- Do not wait for the house to settle if water is getting through
- Photograph failed sealant before it’s redone
- Clean sealant with mild detergent, not abrasives
Photograph failed sealant before it’s redone and keep the builder’s replies. It helps if anything else comes up during the warranty period.
A seal that splits early is often a sign of movement. Have it resealed, and the tray or bath checked, before it gets worse.
New build mastic in Hillingdon, done properly
If your new home has a leaking shower seal, open skirting joints or untidy sealant, we can help. If you are still within the builder’s snagging or warranty period, tell them first, and if it is not put right, get in touch with us. Typical jobs include shower seals failing in the first year or two and skirting joints opening in the first winter, across kitchens, plot handovers and windows & doors.
New flats are going up across London, many of them in larger developments. Snagging there often goes through the developer or managing agent, and failed shower seals, open skirting joints and gaps at thresholds are typical.
A one-year guarantee comes as standard, so you’re covered after we’ve gone.
- Where
- Hillingdon (UB10, UB8, UB9, HA4)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What sealant work can’t fix
To be straight with you, there are a few things sealant won’t fix:
- Plumbing faults behind the sealant
- Cracking that points to a structural problem
- Damaged fittings that need replacing
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Windows & doors
- Plot handovers
- Skirting & floors
- Show homes
- Bathrooms & en suites
- Kitchens
Questions from Hillingdon
Can you do new build mastic in Hillingdon?
Yes, Hillingdon is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job.
I let a flat near West Drayton station. Can you help?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
My new home is still under warranty. Should I contact you?
While the snagging or warranty period runs, the builder should be your first contact. If they’re slow or the fix doesn’t last, we can help.
Can new sealant go on top of the old bead?
No. The old sealant is cut out fully, then clean and prime the joint, and a new bead applied.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Do you use white or clear sealant?
That depends on what the joint meets: white or clear for most sanitary joints, colours for worktops, floors and frames. We’ll agree it with you first.
How long before the joint can be used?
Cure times vary by product. Before we leave, we will tell you the cure time.
Different surfaces, different methods
Windows and doors
External mastic around new windows and doors is sometimes rushed or missed. It’s resealed with an exterior sealant suited to the frame and wall.
Kitchens
Worktops in new homes can move slightly as the house dries, opening gaps behind the upstand. We reseal them with a flexible sealant.
DIY versus a professional finish
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Other services in Hillingdon
Why deal with it now?
Water getting past a failed seal in a new build reaches walls and floors that are still settling. Resealing promptly protects the new finishes around it. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Hillingdon, the repair is bigger than a sealant job.
Doing several joints on one visit is usually more efficient than separate visits. We’ll send you a clear quote for the lot.
Why choose Mr Mastic in Hillingdon
- Neat joints and a tidy finish
- Domestic, commercial and hotel work
- Colour agreed with you before we start
- 180+ five-star Google reviews
What affects the quote in Hillingdon
For a quick quote, just ask. The main things that affect it are:
- How easy the joints are to reach
- The size of the job
- The number of rooms or windows
- The type of sealant required
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Helping us quote
To make quoting easier, please include:
- If it’s domestic, commercial or a hotel
- Any previous sealing or DIY work
- The address or postcode of the job
- How we’d reach the joints
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
How the visit works
Good joint work is mostly preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually takes anything from a few hours to several days, depending on the number of plots. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- We go through the snagging list or plot schedule and agree the joints to do.
- We cut out every bit of the failed or messy sealant.
- We clean off dust from the build and prime the surfaces where the product needs it.
- A sealant chosen for each area goes in and is tooled smooth.
- Finally, each room is checked and you are given the cure time.
Before we arrive
- Let us know about parking restrictions
- Clear the area around the work
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
Every job is quoted individually, so the first step is telling us about yours. Simply phone 0345 464 0079 or drop us an email and describe the job, and photos are welcome.
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New build mastic in Hillingdon: local notes
Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you’ve bought a new home near West Drayton station, the sealant around baths, showers and frames is worth checking in the first year or two. As a London address, Hillingdon can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Hillingdon is about 2 miles north-west of Hayes, in Greater London. Whether you are in the middle of Hillingdon or further out, new build mastic is available for homes and businesses alike. Our Greater London coverage runs to 764 places, Hillingdon among them. London is on our list too, around 15 miles away.
Postcode districts we cover here for new build mastic: UB10, UB8, UB9 and HA4. Streets in the area include The Larches, Brampton Road and Clifton Gardens. Hillingdon sits on or near the B465 and B467, so getting to you is simple. We also cover Uxbridge (1 mile west), Ickenham (1 mile north), Cowley (2 miles south-west), Yiewsley (2 miles south-west) and Hayes (2 miles south-east). Larger places within reach include 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).
Local landmarks in Hillingdon
Locally, jobs take us to homes and businesses close to Highfield Primary School, Norman Leddy Memorial Gardens and Oak Wood School, among other places. Hillingdon’s nearest station is West Drayton station, roughly 2.2 miles south-west. A little further out are Hillingdon Museum and Archives Services (1.4 miles north-west) and Hillingdon Hospital (1 mile south-west). Not far away are Northala Fields and Gutteridge Wood and Meadows.