Greater London · England
Eltham New Build Mastic
Specialist new build mastic for Eltham: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Sealant that never bonded to the surface
- Worktop and upstand sealant coming away
- Messy sealant that spoils new finishes
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
If you manage several properties in or around Eltham, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
About our new build mastic in Eltham
Snagging sealant properly means taking the failed bead out completely. Fresh silicone cannot bond to the old layer, so the joint is cut out, cleaned, dried and resealed. If you have sealant that never bonded to the surface and kitchen sealant that has pulled off the wall, we can put it right, whatever the surface.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Every joint between floor, skirting and threshold has to cope with some movement, in Eltham as anywhere.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or email us.
- Location
- Eltham (SE9, SE12, DA15, BR7)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
New build mastic in Eltham: local notes
The South East is one of the drier parts 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 snagging may go through the developer or managing agent.
For new homes near Mottingham station, it’s worth checking the sealant early, while snags are still fresh. As a London address, Eltham can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Eltham is about 7 miles west of Dartford, in Greater London. We provide new build mastic to homes and businesses in Eltham and the surrounding area. Across Greater London, we cover 764 places, and Eltham is one of them. London is on our list too, around 8 miles away.
Here we cover the SE9, SE12, DA15 and BR7 postcode area for new build mastic. If you need new build mastic at a property on Eltham High Street, Tarnwood Park and Elmslie Court or a nearby road, we can help. You’ll find Eltham on the A20 and B263, so it’s easy for us to get to. We also cover the places around Eltham: Middle Park (1 mile west), New Eltham (1 mile south-east), Well Hall (1 mile north), Coldharbour (1 mile south) and Avery Hill (1 mile north-east). Within a short drive, we also cover London (8 miles north-west), City of Westminster (10 miles north-west), Marylebone (10 miles north-west), Kensington (12 miles west), St Pancras (9 miles north-west) and Shoreditch (8 miles north-west).
Landmarks near Eltham
In Eltham, that means homes and buildings near Horn Park, Eltham Church of England Primary School and The Greyhound Public House. There’s a railway station in Eltham itself: Mottingham station. A little further out are Eltham Community Hospital (less than half a mile north) and Metropolitan Police Museum (2.1 miles east). For a walk, there’s The Tarn and Summer Hill.
Towns and villages near Eltham
Other services in Eltham
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Get a leaking seal dealt with right away
- Raise failed sealant with the developer while you’re covered
- Check bath and shower seals every few months as the house settles
- Keep pictures and emails about snagging items
Wipe the sealant with warm soapy water. Avoid abrasive pads and strong solvents as they wear the bead.
If a shower tray or bath seal splits in the first year, look for movement. Have it resealed, and the tray or bath checked, before it gets worse.
Why deal with it now?
If you’re still in the builder’s snagging or warranty period, ask them to put it right first. If it’s slow, or the same joint keeps failing, a proper reseal from a specialist is the next step. 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 Eltham, the repair is bigger than the sealant job would have been.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why us?
- Old sealant always removed completely
- 180+ five-star Google reviews
- A sealant colour to suit the surroundings
- More than 20 years in sealant work
How we quote for new build mastic
For a quick quote, just ask. What matters most is:
- How many areas need sealing
- The old material and how stubborn it is
- Access and height
- Mould in or behind the old joints
What you pay reflects the work, not guesswork. That is why we ask a few questions first and give you a clear price before we start.
Asking for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.
Surface by surface
Windows and doors
A draught at a new window can be a missed or failed joint. We check and reseal the frame edges.
Show homes
Tired or marked sealant in a show home can be renewed. We cut it out and reseal neatly.
What we cannot put right
To be straight with you, some problems need a different trade:
- Disputes or warranty claims with your builder
- Broken tiles or a split tray
- Baths and trays that move too much for sealant to cope with
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before you book.
Where we work in Eltham
- Skirting & floors
- Show homes
- Windows & doors
- Bathrooms & en suites
- Kitchens
- Plot handovers
What we do, step by step
You do not need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the job takes anything from a few hours to several days, depending on the number of plots for a typical job. For a job in Eltham, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- Every bit of the old builder’s sealant is cut out, with no layer left behind.
- Joints are vacuumed and cleaned of building dust.
- Primer goes on where the surface and product need it, then the new sealant.
- We tool every joint neatly and tell you when each area can be used.
Before we arrive
- Mention if the joints have been sealed before
- Tell us about any water getting in
- Plan for the work area to be out of bounds to pets and children
Get a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or drop us an email.
Related advice
Common questions in Eltham
Can parking be tricky for a visit in Eltham?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Is Eltham in your area for new build mastic?
Yes, Eltham is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
How do I get a quote for new build mastic in Eltham?
We do not 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. We agree the price before any work begins.
How long does the job take?
As a guide, most jobs take a few hours for most snagging lists, longer for a run of plots. Larger jobs naturally take longer, and we will tell you how long to expect.
Are you insured?
Yes. We are fully insured, and we can confirm the details when we quote.
Can new sealant go on top of the old bead?
No. Fresh silicone doesn’t stick to the old layer, so it soon lifts and traps water. We cut the old bead out completely.