Greater London · England
Headstone New Build Mastic
New build mastic for Headstone, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Leaking shower tray seals in a new home
- Joints pulling apart as timber shrinks
- Plot mastic for developers ahead of handover
New build mastic for homes and businesses in Headstone
A new build should have a neat, sound bead at every joint. Smeared, patchy or cracked sealant is worth sorting early, before water reaches anything behind it. We work on show homes, bathrooms & en suites and plot handovers, and people most often call us about shower seals failing in the first year or two and gaps between new skirting and floors.
Across London, commercial floors have movement joints that break down under heavy foot traffic, while new homes need a neat, sound finish around frames, baths and kitchens before handover, in Headstone and beyond.
Your job is guaranteed for a year, as with all our work.
- Location
- Headstone (HA5, HA3, HA2)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
If you are set on DIY, put the effort into 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.
Also near Headstone
What else we do in Headstone
Honest limits
In fairness, there are a few things sealant won’t fix:
- Settlement cracks that need a surveyor
- Broken tiles or a split tray
- Disputes or warranty claims with your builder
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think.
Where we work in Headstone
- Plot handovers
- Show homes
- Bathrooms & en suites
- Windows & doors
- Skirting & floors
- Kitchens
How we quote for new build mastic
You’ll get a clear quote before we start. It takes into account:
- How many areas need sealing
- Whether old sealant or filler has to be cut out
- The size of the job
- When we can work, for business premises
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Helping us quote
When you contact us, it’s useful to know:
- Whether it’s a home or a business
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, call 0345 464 0079 or send us an email.
New homes and floors in Headstone
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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For new homes near Headstone Lane station, it’s worth checking the sealant early, while snags are still fresh.
Headstone is about 1 mile east of Hatch End, in Greater London. Every kind of property in Headstone can book us for new build mastic, old or new, large or small. Every job comes with our 12-month guarantee. Headstone is one of 764 places in Greater London where we work for new build mastic. London is on our list too, about 14 miles from Headstone.
All of HA5, HA3 and HA2 is within our area for new build mastic. Local streets include Anselm Road, Ufford Road and Chantry Road, all of which we cover. Other places close to Headstone include Hatch End (1 mile west), Harrow Weald (1 mile east), South Oxhey (2 miles north-west), Belmont (2 miles east) and Carpenders Park (2 miles north-west). Further out, we also cover London (14 miles south-east), City of Westminster (11 miles south-east), Marylebone (11 miles south-east), Kensington (10 miles south-east), St Pancras (12 miles south-east) and Shoreditch (13 miles south-east).
Local landmarks in Headstone
Locally, jobs take us to homes and businesses close to The Moon & Sixpence pub, Hatch End High School and Headstone Manor Recreation Ground, among other places. There’s a railway station in Headstone itself: Headstone Lane station. A little further out are Hilfield Castle (3.8 miles north) and Kodak Museum (1 mile south-east). Not far away are Harrow Weald Common and Northala Fields.
FAQs for Headstone
Can you do new build mastic in Headstone?
Yes. We work across London and the South East, and Headstone is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll give you a clear price.
Can you help a landlord with a rental near Headstone Lane station?
Yes. We work for landlords and letting agents as well as homeowners. Just call 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Why has my new-build shower seal failed already?
There are normally two causes: movement as the house dries and settles, and sealant laid onto dust without primer. Cutting it out and resealing properly fixes both.
How long should I leave it?
Different products cure at different speeds, so follow the cure time we give you.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
How do I get a quote for new build mastic in Headstone?
Size, access and the old material all affect the cost. Call for a quick quote.
Can you reseal over the builder’s sealant?
No. Sealing over old sealant looks fine for a few weeks, then lifts. All the old sealant comes out before we start.
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.
How to look after the new joints
After the cure time, these simple habits help:
- Don’t wait for the house to settle if water is getting through
- Follow the cure time we give you
- Ventilate bathrooms well, especially in the first year
- Clean sealant with mild detergent, not abrasives
Keep photos of the joints and any snagging correspondence with your builder. It’s useful if you need to raise other issues later.
A seal that splits early is often a sign of movement. Getting it resealed properly, and any movement checked, stops it recurring.
What happens on the day
The work is kept neat and contained to the joints we’re treating. Expect the work to take anything from a few hours to several days, depending on the number of plots, and we tell you how long to leave it before we go. In a London area like Headstone, 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.
- We start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out, with no layer left behind.
- We clean out the dust and grit left from the build.
- Primer goes on where the surface and product need it, then the new sealant.
- We tool every joint neatly and tell you when each area can be used.
Before we arrive
- Clear items away from the joints we are working on
- Let us know if you’ve seen damp or leaks
- On commercial sites, let us know about site rules
How to get a quote
We quote each job on its own, so start by telling us what you need. Simply phone 0345 464 0079 or email us and describe the job.
Advice
Common problems we fix in Headstone
Later trades and the final clean can damage fresh sealant. If it’s disturbed before curing, the joint can be left weak, and the problem shows up after you move in.
People usually contact us when they notice one of these:
- Gaps behind new kitchen upstands
- New-build shower sealant that has already split
- Cracks appearing as a new home settles
- Cracked caulk along new skirting
As a London address, Headstone can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Comparing quotes
- Are they insured?
- What product goes in the joint
- Whether they seal over old material or remove it
- What happens if they find a problem under the old sealant
Leave it or put it right?
A tube of sealant from the DIY shop will not fix the cause: grit, unprimed surfaces and old layers underneath. Cutting out, cleaning and priming are what make the difference. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Headstone, the repair is bigger than a sealant job.
What it costs depends on the amount of work, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
What you get with us
- 180+ five-star Google reviews
- A 12-month guarantee on all work
- Anti-fungal silicone where joints get wet
- ARBOMaster approved applicator
Read how sealant jobs are priced and our reviews.