Greater London · England
New-build mastic & snagging in Northfields, Greater London
New build mastic across Northfields and nearby, with old sealant always removed completely.
- Internal frame sealant that has split
- Gaps between new skirting and floors
- Sealant that never bonded to the surface
New build mastic for homes and businesses in Northfields
Our new-build work comes in two parts: plot mastic for developers, and putting right failed sealant for people who’ve bought a new home. Both get the same care over preparation. If you’re dealing with smeared, uneven beads picked up at snagging and sealant applied over dusty or wet surfaces, we can help.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Wherever a floor meets a wall, a skirting or a threshold, the joint has to allow for movement, in Northfields as anywhere.
Big or small, you get the same 12-month guarantee.
- Location
- Northfields (W5, W13, TW8)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of new build mastic
The price is agreed before any work begins. It takes into account:
- Any working-time requirements on site
- How easy the joints are to reach
- Whether there’s mould to deal with
- The number and length of the joints
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Photos by email, if that’s easy
- What’s wrong with the joints now
- Access, such as stairs, a lift or height
- Where the property is
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work.
Places near Northfields
Other services in Northfields
How to look after the new joints
A little care helps the new joints last. We recommend:
- Raise failed sealant with the developer while you are covered
- Avoid running a DIY bead over the old one
- Wipe joints with warm soapy water
- Act quickly if a seal starts to leak
Keep an eye on the joints over the first couple of years. Small gaps can appear as the house dries.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Early resealing keeps the job small and the new finishes intact.
What happens on the day
When we arrive, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work begins. Most jobs take anything from a few hours to several days, depending on the number of plots. In Northfields, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First we work through your snagging list or plot schedule with you.
- The old bead comes out in full, with no layer left behind.
- We clean off dust from the build and prime the surfaces where the product needs it.
- 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
- Plan for the work area to be out of bounds to pets and children
- Mention any parking rules near the property
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Read more
Your questions about new build mastic in Northfields
Can you help a landlord with a rental near Brentford station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Can parking be tricky for a visit in Northfields?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
How long does new build mastic take?
As a guide, most jobs take anything from a few hours to several days, depending on the number of plots. Bigger jobs take longer, and we’ll tell you how long to expect.
Will there be a smell?
Some sealants have a smell while they cure, but it fades. Ventilation helps.
Is it normal for sealant to crack in a new home?
New homes dry out and move in their first couple of years, and sealant is often rushed onto dusty, unprimed surfaces. Both lead to early failure.
What does new build mastic cost?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before work begins.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few photos.
What happens if it’s left?
If you are still in the builder’s snagging or warranty period, ask them to put it right first. If it keeps failing or is not dealt with, we can reseal it properly. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
What you pay reflects the work, not guesswork. That is why we ask about the job first.
What you get with us
- Full insurance on every job
- 20+ years of sealant experience
- Experience in homes, commercial sites and hotels
- Any old sealant cut out fully, not covered over
Take a look at what affects the cost and what customers say.
New build mastic around Northfields
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent.
For new homes near Brentford station, it’s worth checking the sealant early, while snags are still fresh. As a London address, Northfields can be tricky for parking: let us know about parking bays, permits or a driveway.
Northfields is about 1 mile south of Ealing, in Greater London. Our applicators cover new build mastic for homes and businesses in Northfields and nearby. Our area takes in 764 places across Greater London, large and small. Our London page covers work nearby.
Every address in W5, W13 and TW8 is within our area for new build mastic, from the main roads to the quietest streets. You will find streets such as Burns Road, South Road and Elers Road, all of which we cover. Main roads around Northfields include the A3002, which makes travel easy. Close by, we work in Brentford (1 mile south-east), Gillette Corner (1 mile south-west), Brentford End (1 mile south), Osterley (2 miles south-west) and Spring Grove (2 miles south-west). Further out, we also cover London (9 miles east), City of Westminster (7 miles east), Marylebone (7 miles east), Kensington (5 miles east), St Pancras (9 miles east) and Shoreditch (10 miles east).
Landmarks near Northfields
In Northfields, that means homes and buildings near Ealing Fields High School, Great Ealing School and Ealing Park Tavern, among other places. Also close by are Library for Iranian Studies (1.8 miles east) and Lammas Park (less than half a mile north). The nearest railway station is Brentford station, about 0.8 miles south. Well-known places in the area include Gunnersbury Park House - Large Mansion (1.2 miles east) and Treaty Centre (3 miles south-west). Green spaces nearby include Middle Lake and Long Wood.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
What we can’t put right
We will not take on work that will not last, so these are the limits:
- Disputes or warranty claims with your builder
- Structural cracks in walls or ceilings
- Broken tiles or a split tray
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly before you book.
Where we work in Northfields
- Show homes
- Kitchens
- Plot handovers
- Skirting & floors
- Windows & doors
- Bathrooms & en suites
Landlords, agents and businesses in Northfields
We also work for property managers and facilities teams in Northfields and across Greater London. We can quote a run of properties together.
Landlords and letting agents in Northfields can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.