Greater London · England
Harringay New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for homes and businesses in Harringay and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Internal frame sealant that has split
- Worktop and upstand sealant coming away
- Shower seals failing in the first year or two
New build mastic around Harringay
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. Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent.
If you’ve bought a new home near Harringay Green Lanes station, the sealant around baths, showers and frames is worth checking in the first year or two.
Harringay is about 2 miles north-west of West Hackney, in Greater London. If you need new build mastic in Harringay, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We are based in Crawley and cover Greater London. We cover 764 towns and villages across Greater London, large and small. There’s also a page for London, about 6 miles away.
Here we cover the N4, N15 and N8 postcode area for new build mastic. We cover properties on Elyne Road, Denton Road and Warham Road and the roads around them. If you are just outside Harringay, we cover Duckett's Green (1 mile north), West Green (1 mile north-east), St Ann's (1 mile east), Manor House (1 mile south) and Seven Sisters (1 mile east). Larger places within reach include London (6 miles south), City of Westminster (5 miles south-west), Marylebone (5 miles south-west), Kensington (7 miles south-west), St Pancras (4 miles south) and Shoreditch (4 miles south).
Landmarks near Harringay
Typical jobs here are in homes near Chestnuts Park, Park View School and Moselle Upper School. You will also find The Salisbury pub (within half a mile north) and Church of St Andrew (1.1 miles south-east). Harringay has its own railway station: Harringay Green Lanes station. Other landmarks nearby include Montfichet's Tower (4.7 miles south) and Markfield Beam Engine and Museum (1.6 miles east). Green spaces nearby include Railway Fields and Highgate Hill.
New build mastic in Harringay
A new house keeps drying out and settling for its first couple of years. Timber dries and shrinks, and baths and trays settle, and sealant applied in a hurry at handover can split. Typical jobs include shower seals failing in the first year or two and plot mastic for developers ahead of handover, on windows & doors, bathrooms & en suites and skirting & 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 Harringay and beyond.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Place
- Harringay (N4, N15, N8)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
To keep the joints looking good and working properly:
- Clean sealant with mild detergent, not abrasives
- Get a leaking seal dealt with straight away
- Ventilate bathrooms well, especially in the first year
- Put sealant faults on your snagging list early
Follow the cure time we give you before the area gets wet. Silicone is generally left for about a day before water reaches them.
A seal that splits early is often a sign of movement. Have it resealed, and the tray or bath checked, before it gets worse.
Do you need new build mastic in Harringay?
Baths and trays settle under load once the home is lived in. If a bath wasn’t filled when it was sealed, the bead is stretched the first time it’s used and can tear.
Keep an eye out for any of the following:
- Plot mastic for developers ahead of handover
- Cracked caulk along new skirting
- Internal frame sealant that has split
- Shower seals failing in the first year or two
Harringay is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What to look for in a quote
- Who turns up on the day
- Whether the sealant suits the joint
- Whether you can choose the colour
- The length of the guarantee
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we are fully insured.
What the job involves on each surface
Show homes
We seal show-home bathrooms, kitchens and frames ready for viewings. Tell us when the home is open so we can plan around it.
Kitchens
Worktop, upstand and sink joints in new kitchens often get a hurried bead. We take it out and reseal neatly, colour-matched where it shows.
Also near Harringay
Other services in Harringay
What sealant work can’t fix
It helps to know what we cannot do:
- Disputes or warranty claims with your builder
- Leaks from pipes, valves or wastes, which need a plumber
- Structural cracks in walls or ceilings
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think before you book.
What we seal
- Plot handovers
- Windows & doors
- Skirting & floors
- Show homes
- Bathrooms & en suites
- Kitchens
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes a few hours in a single home from start to finish. In a London area like Harringay, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We look at why each joint failed, including any movement.
- We remove the failed sealant and clean the joints.
- Joints are dried and primed where the product calls for it.
- 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
- Try not to wet indoor joints just before the visit
- Tell us if parking is tricky
- Let us know about stairs, lifts or work at height
Get 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 will have a clear quote before work begins.
Related advice
Your questions about new build mastic in Harringay
Is parking an issue for new build mastic in Harringay?
Parking in Harringay, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Do you cover Harringay for new build mastic?
Yes. Our work covers London and the South East, and Harringay is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
What information do you need?
Just the basics: where it is, what you’ve noticed and how we reach it. Then call 0345 464 0079 or send us an email.
Is there a guarantee?
Yes, for a year. If anything isn’t right with the work within the year, let us know and we will sort it.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Can you do plot mastic on a new development?
Yes. We carry out plot mastic and second-fix sealing for builders and developers. Send the schedule and any specification and we will give you a quote.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
How we quote for new build mastic
There’s no set price list. The quote depends on:
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
- Which sealant suits the joint
- The number and length of the joints
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Asking for a quote
There’s no need for technical detail. Just tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- How we’d reach the joints
- How many joints, rooms or windows are involved
- If it’s domestic, commercial or a hotel
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.