Kent · England
New Build Mastic in Northfleet
New build mastic for Northfleet, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Gaps between new skirting and floors
- Sealant applied over dusty or wet surfaces
- Gaps opening as the house dries out and settles
New build mastic in Northfleet, done properly
Some owners wait for the first year’s movement before having joints redone. For small cosmetic gaps, that is reasonable, but a seal that is letting water through needs doing now. We work on plot handovers, kitchens and windows & doors, and people most often call us about smeared, uneven beads picked up at snagging and cracked sealant around new window and door frames.
In a town like Northfleet, skirting and floor joints open up as homes settle and floors move with the seasons. Those joints need a flexible sealant, as rigid filler soon cracks out.
We stand behind the work with a one-year guarantee.
- Where
- Northfleet (DA11)
- Wider area
- Kent
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
New build mastic in Northfleet: local notes
Northfleet is close to the coast. Plot mastic on new homes near the coast takes more weather than it would inland, so it’s worth checking at snagging. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Around Northfleet, as everywhere, new build mastic is only as good as the preparation behind it.
Northfleet is about 5 miles east of Dartford, in Kent. Across the DA11 area, we cover new build mastic for homes and businesses. We cover 922 towns and villages across Kent, from the larger towns to small villages. We also work in London, about 20 miles from Northfleet.
All of DA11 is within our area for new build mastic, from the main roads to the quietest streets. Local streets include Lawrance Square, London Road and Marks Square, and we cover them all. Main roads around Northfleet include the A2 and A226. If you’re just outside Northfleet, we cover Painters Ash (1 mile south-west), Springhead (1 mile west), Windmill Hill (1 mile east), Northfleet Green (1 mile south) and Gravesend (1 mile east). Within a short drive, we also cover Maidstone (14 miles south-east), Dartford (5 miles west), Sevenoaks (13 miles south-west), Swanley (8 miles west), Kings Hill (11 miles south) and Foley Park (13 miles south-east).
Near you in Northfleet
Locally, jobs take us to homes and businesses close to The Six Bells pub, Saint George's Church of England School and Copperfield Academy, among other places. Northfleet’s nearest station is Gravesend station, about 1 mile north-east of the centre. Well-known places in the area include Bluewater (3.3 miles west) and Stone Castle (3.1 miles west). Open spaces near Northfleet include Chafford Gorges Nature Park and Sawyers Lake.
For landlords and businesses
For anyone letting property in or around Northfleet, several properties can be quoted together. Send us the addresses and the work at each, and pictures by email help.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Common problems we fix in Northfleet
The wrong product is sometimes used in the wrong place: caulk where water collects, or a rigid product on a moving joint. Neither lasts long.
The problems people usually mention when they call include:
- Cracks appearing as a new home settles
- Cracked sealant around new window and door frames
- Smeared, uneven beads picked up at snagging
- Sealant applied over dusty or wet surfaces
If you’ve bought a new home near Gravesend station, the sealant around baths, showers and frames is worth checking in the first year or two.
Before you book anyone
- How much experience the applicator has
- How long the guarantee is
- Whether they’re fully insured
- What happens if they find a problem under the old sealant
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
The process
When we arrive, we look over the joints with you first, so there are no surprises. Surfaces next to the work are protected before any work begins. The work generally takes a few hours for most snagging lists, longer for a run of plots. For a job in Northfleet, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.
- We start by going through the snagging items or plot schedule with you.
- The failed sealant is removed completely, with no layer left behind.
- Joints are vacuumed and cleaned of building dust.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Plan for the work area to be out of bounds to pets and children
- Try not to wet indoor joints just before the visit
Ask for a quote
To get a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Advice
How to look after the new joints
To keep the joints looking good and working properly:
- Get a leaking seal dealt with right away
- Look at the sealant regularly in the first couple of years
- Follow the cure time we give you
- Raise failed sealant with the developer while you are covered
Follow the cure time we give you before the area gets wet. Silicone is normally left for about a day to cure enough for use.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Catching it early keeps the fix to the sealant.
Different surfaces, different methods
Windows and doors
Internal joints between frames and plaster often crack as a new house dries. We cut out the cracked bead and reseal with a flexible sealant.
Plot handovers
Good preparation at handover saves snagging later. We clean out building dust before sealing.
When something else is needed
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- A tray or bath that isn’t properly supported, until it’s fixed
- Leaks from pipes, valves or wastes, which need a plumber
- Your warranty claim itself, which is between you and the builder
If you’re not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer before booking.
Surfaces we seal
- Kitchens
- Plot handovers
- Show homes
- Bathrooms & en suites
- Windows & doors
- Skirting & floors
Northfleet: your questions answered
Can you do new build mastic in Northfleet?
Yes, Northfleet is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear price.
Do you work for landlords with property near Gravesend station?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before we start.
What colour sealant will you use?
White and clear are the most common, but other colours are available. We match the colour to the finish and agree it with you.
Is the work guaranteed?
Yes: twelve months. If anything is not right with the work within the year, let us know and we will sort it.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Do I have to be there?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we will agree access with you when we book.
How long does new build mastic take?
It depends on the size of the job, but as a guide it takes a few hours for most snagging lists, longer for a run of plots. We will tell you when we quote.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.