Greater London · England
New Build Mastic in Seven Sisters
Specialist new build mastic for Seven Sisters: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Untidy sealant flagged on a snagging list
- Plot mastic for developers ahead of handover
- Gaps between new skirting and floors
What the job involves on each surface
Show homes
We seal show-home bathrooms, kitchens and frames. Tell us when the home is open so we can plan around it.
Skirting and floors
As timber and screed dry, skirting and floors shift. Caulk cracks; a flexible sealant moves with it in a colour to suit.
How we handle new build mastic in Seven Sisters
Some new-home owners let the house settle before resealing. For small cosmetic gaps, that is reasonable, but a seal that is letting water through needs doing now. We work on kitchens, skirting & floors and plot handovers, and the jobs we see most are internal frame sealant that has split and beads laid onto grit and dust from the build.
London homes range from new-build flats to period conversions with new floors laid over old boards. Every joint between floor, skirting and threshold has to cope with some movement.
Our work is backed for twelve months.
- Where
- Seven Sisters (N15, N17, N16)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common problems we fix in Seven Sisters
Sealant applied onto damp surfaces does not bond well. Site programmes do not always leave time for joints to dry before the sealant goes on.
Look out for any of the following:
- Cracked sealant around new window and door frames
- Skirting joints opening in the first winter
- Cracks appearing as a new home settles
- Messy sealant that spoils new finishes
If you’ve bought a new home near Seven Sisters station, the sealant around baths, showers and frames is worth checking in the first year or two.
What to look for in a quote
- Who turns up on the day
- Whether they’re fully insured
- What preparation is included
- What guarantee comes with the work
How we quote for new build mastic
You will get a clear quote before work begins. It takes into account:
- Mould in or behind the old joints
- How easy the joints are to reach
- When we can work, for business premises
- The type of sealant required
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or send us an email and we’ll talk you through it.
What to tell us for a quote
To help us quote quickly, let us know:
- The type of property
- How many joints, rooms or windows are involved
- How we’d reach the joints
- Pictures of the joints, sent by email
There’s no standard price list. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or send us an email.
Places near Seven Sisters
Also in Seven Sisters
New homes and floors in Seven Sisters
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent.
As a London address, Seven Sisters can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Seven Sisters is about 2 miles west of Walthamstow, in Greater London. Across the N15 area, we can carry out new build mastic at your property. We cover 764 towns and villages across Greater London, large and small. We also work in London, around 6 miles away.
We cover every part of N15, N17 and N16 for new build mastic and the streets around it. That includes homes and businesses on Ida Road, Elmar Road and Grove Road. Close by, we work in South Tottenham (1 mile north), Tottenham Green (1 mile north), St Ann's (1 mile west), Tottenham Hale (1 mile north-east) and West Green (1 mile west). Larger places within reach include London (6 miles south), City of Westminster (6 miles south-west), Marylebone (5 miles south-west), Kensington (8 miles south-west), St Pancras (4 miles south-west) and Shoreditch (4 miles south).
Local landmarks in Seven Sisters
In Seven Sisters, that means homes and buildings near No.8 Seven Sisters pub, Ada College and Chestnuts Park, among other places. You’ll also find Gladesmore Community School (less than half a mile east) and Church of St Andrew (0.8 miles south). Seven Sisters has its own railway station: Seven Sisters station. Other landmarks nearby include Montfichet's Tower (4.9 miles south) and The Mall Wood Green (1.7 miles north-west). Open spaces near Seven Sisters include Highgate Hill and Woodberry Wetlands.
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
How the visit works
The work is kept neat and contained to the area we’re working on. The job normally takes a few hours for most snagging lists, longer for a run of plots. In a London area like Seven Sisters, 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 start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- We cut out every bit of the failed or messy sealant.
- Surfaces are cleaned of building dust and primed where needed.
- New sealant suited to each joint is applied and tooled neatly.
- Finally, each room is checked and you are given the cure time.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any parking rules near the property
- Clear items away from the joints we’re working on
How to get a quote
If you are in Seven Sisters and need new build mastic, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
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When it isn’t the sealant
Before booking, it’s worth knowing the limits too:
- Leaking fittings rather than failed sealant
- Structural cracks in walls or ceilings
- Your warranty claim itself, which is between you and the builder
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Surfaces we seal
- Show homes
- Windows & doors
- Kitchens
- Plot handovers
- Skirting & floors
- Bathrooms & en suites
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 Seven Sisters, the repair is bigger than a sealant job.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why book with us
- We never seal over old sealant
- Tidy, careful work
- White, clear, grey or coloured to suit, where the product allows
- We’re fully insured
Seven Sisters questions
I let a flat near Seven Sisters station. Can you help?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Can parking be tricky for a visit in Seven Sisters?
Parking in Seven Sisters, 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.
Why has my new-build shower seal failed already?
There are usually two causes: movement as the house dries and settles, and sealant laid onto dust without primer. A proper reseal deals with both.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
How long should I leave it?
Cure times vary by product and the conditions. Before we leave, we will tell you the cure time.
What do you put in the joint?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
What colour sealant will you use?
We use white, clear or a colour to suit the finishes. Tell us what you’d like when you get a quote.