Greater London · England
New-build mastic & snagging in Mottingham, Greater London
Plot mastic for developers and snagging failed sealant in new homes for Mottingham, backed by a one-year guarantee. Ask us for a quote.
- Cracks appearing as a new home settles
- Beads laid onto grit and dust from the build
- Internal frame sealant that has split
Surface by surface
Plot handovers
Good preparation at handover saves snagging later. Dust from the build is removed first and primer used where needed.
Show homes
Show homes need sealant that looks right from day one. Every bead is neat and coloured to suit the room.
New build mastic in Mottingham
Some owners wait for the first year’s movement before having joints redone. That makes sense for small gaps that are just cosmetic, but a seal that is letting water through needs doing now. If you are dealing with cracks appearing as a new home settles and cracked caulk along new skirting, we can put it right.
New flats are going up across London, many of them in larger developments. In a new development, snags are often reported through the developer or the managing agent, and failed shower seals, open skirting joints and gaps at thresholds are typical.
All our work comes with our 12-month guarantee.
- Where
- Mottingham (SE9, SE12, BR1)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
When to call us in Mottingham
On many sites, sealant goes on in the final rush before handover. Dusty, unprimed joints are common, and the sealant sits on grit instead of the surface.
The most common problems we see are:
- Internal frame sealant that has split
- Messy sealant that spoils new finishes
- Gaps behind new kitchen upstands
- Leaking shower tray seals in a new home
For new homes near Grove Park station, it’s worth checking the sealant early, while snags are still fresh.
What to look for in a quote
- How much experience the applicator has
- Which colour the sealant will be
- Is the old sealant removed completely?
- Which sealant they’ll use, and why
How the visit works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from a few hours to several days, depending on the number of plots, and the area is left clean. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- First we work through your snagging list or plot schedule with you.
- 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.
- Finally, each room is checked and you’re given the cure time.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Mention any parking rules near the property
- On commercial sites, let us know about site rules
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Advice
New build mastic around Mottingham
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Many of London’s new homes are flats in bigger developments, where snags may need reporting through the developer or the managing agent.
Mottingham is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Mottingham is about 1 mile south-west of Eltham, in Greater London. Our applicators cover new build mastic for homes and businesses in Mottingham, as part of our work across Greater London. Our area takes in 764 places across Greater London, large and small. London is on our list too, around 7 miles away.
Work in SE9, SE12 and BR1 works the same way as everywhere else we cover. That includes homes and businesses on Horley Road, Dorset Road and Albert Road. Other places close to Mottingham include Chinbrook (1 mile south-west), Grove Park (1 mile west), Coldharbour (1 mile east), Middle Park (1 mile north) and Horn Park (1 mile north-west). Further out, we also cover London (7 miles north-west), City of Westminster (10 miles north-west), Marylebone (10 miles north-west), Kensington (11 miles north-west), St Pancras (9 miles north-west) and Shoreditch (8 miles north-west).
Near you in Mottingham
We work in homes and buildings around Colfe's School, Chinbrook Meadows and Haberdashers' Aske's Knights Academy. The closest station to Mottingham is Grove Park station, about 0.7 miles west of the centre. Nearby you will also find Greenwich Castle (3.5 miles north-west) and Prefab Museum (1.7 miles west). Not far away are Summer Hill and The Tarn.
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Report sealant problems to your builder during the snagging period
- Avoid running a DIY bead over the old one
- Look at the sealant regularly in the first couple of years
- Use the extractor fan every time you shower
Clean the sealant with a mild detergent and a soft cloth. Avoid abrasive pads and strong solvents.
Early snagging is easier snagging. Small faults turn into leaks if left in a busy bathroom.
When it isn’t the sealant
Sealant is not the answer to every problem, and we’d rather say so up front. It will not solve:
- Cracked trays, tiles or worktops
- 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 call 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Skirting & floors
- Windows & doors
- Kitchens
- Bathrooms & en suites
- Show homes
- Plot handovers
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Towns and villages near Mottingham
What else we do in Mottingham
Common questions in Mottingham
Do you work for landlords with property near Grove Park station?
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 give you a clear price.
Is Mottingham in your area for new build mastic?
Yes, Mottingham is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Are you insured?
Yes. We are fully insured for every job we do.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Why does sealant fail so quickly in new builds?
New homes dry out and move in their first couple of years, and sealant is often applied quickly onto dusty surfaces. Either can make it fail early.
Do you work through snagging lists?
Yes. Send it with photos and we’ll quote for the sealant items. If something is not sealant, we’ll say so.
What colour sealant will you use?
That depends on what the joint meets: white or clear for most sanitary joints, colours for worktops, floors and frames. We agree the colour before work begins.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.