Greater London · England
New-build mastic & snagging in Harlington, Greater London
New build mastic for Harlington and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Frame joints opening as the plaster dries
- Gaps opening as the house dries out and settles
- Leaking shower tray seals in a new home
New build mastic in Harlington, done properly
New homes move as they dry out. Timber shrinks, plaster dries and baths and trays bed down, and sealant applied in a hurry at handover can split. If you are dealing with sealant applied over dusty or wet surfaces and skirting joints opening in the first winter, we can put it right.
Shops, offices and commercial units across London have hard-wearing floors with movement joints that need resealing as they wear, and new homes need their plot mastic finished properly before handover, in Harlington and beyond.
We stand behind the work with a one-year guarantee.
- Place
- Harlington (UB3, TW6, UB7)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What the job involves on each surface
Skirting and floors
Where the floor meets a bath panel or kitchen plinth, the joint keeps mop water out. They get a flexible, water-resistant sealant.
Windows and doors
Draughts around new frames are often a sealant gap. We look at the joints and reseal where needed.
Quotes for new build mastic in Harlington
You will get a clear quote before any work starts. It takes into account:
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
- The product the joint needs
- The number and length of the joints
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs. Call for a quick quote and we’ll explain what it covers.
Asking for a quote
There’s no need for technical detail. Just tell us:
- Roughly how big the job is
- Whether it’s a home or a business
- Any access issues, like height or stairs
- Photos by email, if that’s easy
For a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before work begins.
DIY sealant or a professional job?
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 doesn’t work out, we can still put it right.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
Do you need new build mastic in Harlington?
If plaster or screed was still damp when it was sealed, the bond suffers. Site programmes do not always leave time for joints to dry first.
Common reasons people contact us include:
- Smeared, uneven beads picked up at snagging
- Beads laid onto grit and dust from the build
- Shower seals failing in the first year or two
- Worktop and upstand sealant coming away
As a London address, Harlington can be tricky for parking: let us know about parking bays, permits or a driveway.
Comparing quotes
- Are they insured?
- What product goes in the joint
- How long the guarantee is
- What happens if they find a problem under the old sealant
Landlord and commercial work in Harlington
We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Harlington: your questions answered
Can you do new build mastic in Harlington?
Yes, Harlington is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
Is parking a problem for a job in Harlington?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
How long does the job take?
It depends on the size of the job, but most jobs take anything from a few hours to several days, depending on the number of plots. We’ll tell you when we quote.
Is the work guaranteed?
Yes, always. There’s a 12-month guarantee on every job.
Is it normal for sealant to crack in a new home?
Lots of new homes see sealant crack early, because the house is drying and settling. Poor preparation at handover adds to it.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Where are you based?
We work from Crawley. We cover Harlington and the rest of Greater London.
Also near Harlington
Also in Harlington
What happens on the day
The work is kept neat and contained to the joints we’re treating. The job usually takes a few hours for most snagging lists, longer for a run of plots, and we tell you how long to leave it before we go. In Harlington, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each joint is checked for movement before any work starts.
- We remove the failed sealant and clean the joints.
- We make sure the joints are dry and prime them if needed.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- We check every joint and leave you with the cure times.
How to prepare
- Let us know about earlier repairs to the joints
- Mention any sign-in or site rules at work premises
- Clear the area around the work
Ask for a quote
We do not publish a price list. Instead, we send you a clear quote for your job. To arrange one, phone 0345 464 0079 or drop us an email.
Related advice
What new build mastic looks like in Harlington
Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent. The South East is one of the drier parts of the UK, 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 Heathrow Terminals 2 & 3 Rail station, the sealant around baths, showers and frames is worth checking in the first year or two.
Harlington is about 2 miles south-east of West Drayton, in Greater London. Harlington gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Harlington is one of 764 places in Greater London where we work for new build mastic. We also work in London, about 15 miles from Harlington.
Our applicators cover all of the UB3, TW6 and UB7 postcode area for new build mastic. You will find streets such as New Road, Bath Road and Manor Lane. We also cover the places around Harlington: Sipson (1 mile north-west), Hatton (1 mile south-east), Cranford (1 mile south-east), Heathrow (1 mile south-west) and Harmondsworth (2 miles west). We also work in nearby towns such as London (15 miles east), City of Westminster (12 miles east), Marylebone (13 miles east), Kensington (10 miles east), St Pancras (14 miles east) and Hoxton (15 miles east).
Local landmarks in Harlington
Around Harlington, our work takes us to homes and buildings near The Red Lion pub, Harlington Community School and Lake Farm Country Park, among other places. Harlington’s nearest station is Heathrow Terminals 2 & 3 Rail station, about 1.2 miles south-west of the centre. A little further out are Harlington (0.6 miles north-west) and Treaty Centre (3.4 miles east). Open spaces near Harlington include Staines Reservoirs and Crane Meadows.
When something else is needed
To be straight with you, there are a few things sealant will not fix:
- A tray or bath that isn’t properly supported, until it’s fixed
- Structural cracks in walls or ceilings
- Leaks from pipes, valves or wastes, which need a plumber
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Surfaces we seal
- Windows & doors
- Plot handovers
- Show homes
- Skirting & floors
- Kitchens
- Bathrooms & en suites