Greater London · England
New-build mastic & snagging in Lower Holloway, Greater London
Plot mastic for developers and snagging failed sealant in new homes in Lower Holloway, with a one-year guarantee on every job. Ask us for a quote.
- Plot mastic for developers ahead of handover
- Leaking shower tray seals in a new home
- Frame joints opening as the plaster dries
New build mastic for homes and businesses in Lower Holloway
Across Lower Holloway, we work for both new-home owners and the builders handing those homes over. Whether it’s one en suite or a run of plots, the method is the same: remove, clean, prime where needed, then a neat new bead. We work on skirting & floors, windows & doors and bathrooms & en suites, and people most often call us about messy sealant that spoils new finishes and cracked caulk along new skirting.
Much of London’s new housing is flats 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.
Our work is backed for twelve months.
- Place
- Lower Holloway (N7, N1, N5)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Quotes for new build mastic in Lower Holloway
The quote reflects the job in front of us. We take into account:
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
- When we can work, for business premises
- The product the joint needs
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we will go through it with you.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- The type of property
- Photos by email, if that’s easy
- Any access issues, like height or stairs
- Where the property is
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work and give you a clear price.
New build mastic in Lower Holloway: local notes
Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For new homes near Caledonian Road & Barnsbury station, it’s worth checking the sealant early, while snags are still fresh. As a London address, Lower Holloway can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Lower Holloway is about 2 miles north of St Pancras, in Greater London. If you need new build mastic in Lower Holloway, it’s easy to get a quote: please ring 0345 464 0079 or email us. We are based in Crawley and cover Greater London. Across Greater London, we cover 764 places, and Lower Holloway is one of them.
Work in N7, N1 and N5 works the same way as everywhere else we cover. If you need new build mastic at a property on Penn Road, Cliff Road and Lough Road or anywhere close by, our applicators can take on the job. Main roads around Lower Holloway include the A5203. Close by, we work in Barnsbury (1 mile south), Holloway (1 mile north), Nag's Head (1 mile north), Tufnell Park (1 mile north-west) and Islington (1 mile south-east). We also work in nearby towns such as London (4 miles south), City of Westminster (3 miles south-west), Marylebone (3 miles south-west), Kensington (5 miles south-west), Walthamstow (5 miles north-east) and Whitechapel (3 miles south-east).
Near you in Lower Holloway
In Lower Holloway, that means homes and buildings near St Mary Magdalene Gardens, Musical Theatre Academy and St Mary Magdalene Academy and the streets around them. You’ll also find Vaughan Williams Memorial Library (1.6 miles south-west) and The Lamb Tavern Public House (within half a mile west). Lower Holloway’s nearest station is Caledonian Road & Barnsbury station, roughly 0.5 miles south. Other landmarks nearby include Arsenal Football Club Museum (0.6 miles north-east) and Montfichet's Tower (2.6 miles south). For a walk, there’s Dartmouth Park Hill and Barnsbury Wood.
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, 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.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Lower Holloway: your questions answered
Can you do new build mastic in Lower Holloway?
Yes, Lower Holloway is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Do you work for landlords with property near Caledonian Road & Barnsbury station?
Yes, we work for letting agents and landlords. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Where are you based?
We’re based in Crawley, West Sussex, and we work across South East England, London and Scotland.
What does new build mastic cost?
It depends on the job, so we quote each one individually. For a quick quote, ring 0345 464 0079 or send us an email with a short description of the job.
Is there any odour?
Some sealants have a smell while they cure. Opening a window helps.
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. Cutting it out and resealing properly fixes both.
Can new sealant go on top of the old bead?
No. Over-sealing traps mould and water and soon fails. We remove every bit of the old bead before resealing.
Landlord and commercial work in Lower Holloway
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
When it isn’t the sealant
New sealant can’t fix everything, and we’d rather say so up front. Sealant will not put right:
- Structural cracks in walls or ceilings
- Baths and trays that move too much for sealant to cope with
- Deciding who is responsible under a builder’s warranty
If you are not sure, just call 0345 464 0079 or email us and we will give you a straight answer.
What we seal
- Show homes
- Kitchens
- Skirting & floors
- Plot handovers
- Windows & doors
- Bathrooms & en suites
Towns and villages near Lower Holloway
Other services in Lower Holloway
How the visit works
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and clear up. Most jobs take a few hours in a single home. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Lower Holloway. It helps if you can point us to a visitor permit or a bay close to the door.
- We go through the snagging list or plot schedule and agree the joints to do.
- Failed or untidy sealant is cut out completely.
- Surfaces are cleaned of building dust and primed where needed.
- New sealant suited to each joint is applied and tooled neatly.
- Each area is checked and left with its cure time.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we are working on
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
We quote each job on its own. Just ring 0345 464 0079 or send us an email with the details and send pictures if you have them.
Read more
Leave it or put it right?
Small cosmetic gaps can wait for the house to settle, but water getting through can’t. Not sure whether yours can wait? You can ring 0345 464 0079 or send us an email with a few photos. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Lower Holloway, the repair is bigger than the sealant job would have been.
Combining jobs into one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. We will give you a clear price for the lot.
Why us?
- More than 20 years in sealant work
- Sealant colour chosen to suit
- Every job guaranteed for a year
- Anti-fungal sanitary silicone in wet areas
Read what affects the cost and customer reviews.
What the job involves on each surface
Skirting and floors
As timber and screed dry, skirting and floors shift. Caulk cracks; a flexible sealant moves with it painted or coloured to suit.
Windows and doors
External mastic around new windows and doors is sometimes rushed or missed. We reseal it with a weatherproof, flexible sealant.