Greater London · England
New-build mastic & snagging in Coombe, Greater London
New build mastic in Coombe from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Internal frame sealant that has split
- Smeared, uneven beads picked up at snagging
- Plot mastic for developers ahead of handover
Coombe: your questions answered
Do you cover Coombe for new build mastic?
Yes. Our work covers London and the South East, and Coombe is part of that. Just ring 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Do you work for landlords with property near Norbiton station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
Where do you work from?
Mr Mastic is based in Crawley. We cover Coombe and the rest of Greater London, along with the rest of our area.
Do you work for developers?
Yes. We seal plots to the developer’s programme, room by room. Get in touch with the number of plots and the scope for a clear quote.
Are you insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
What does new build mastic cost?
Every job is different, so each one gets its own quote. To get one, phone 0345 464 0079 or send us an email with a short description of the job.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little.
Can I add another job to the visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
New build mastic for homes and businesses in Coombe
Developers send us the plot schedule and we work through it. Bathrooms, en suites, kitchens, frames and skirting are sealed ready for handover with a sealant suited to each area. We are often asked to deal with gaps between new skirting and floors and shower seals failing in the first year or two, across skirting & floors, plot handovers and show homes.
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.
We stand behind the work with a 12-month guarantee, so you’re not left on your own once the job is done.
- Place
- Coombe (KT2, KT3, SW20)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What the job involves on each surface
Kitchens
Sink joints are wet all the time. We use a sealant suited to kitchens suited to the job.
Plot handovers
Send us the schedule and any sealant specification for a quote. We seal bathrooms, kitchens, frames and floors to the agreed spec.
Joints and finishes in Coombe homes
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. 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 Norbiton station, it’s worth checking the sealant early, while snags are still fresh.
Coombe is about 1 mile north of New Malden, in Greater London. Coombe gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Coombe is one of 764 places in Greater London we cover. Our London page covers work nearby, about 9 miles away.
Here we cover the KT2, KT3 and SW20 postcode area for new build mastic. Whether your property is on West Road, Crown Road and Traps Lane or a nearby road, we can help. Neighbouring places we cover for new build mastic include Motspur Park (1 mile south-east), Coombe Hill (1 mile north), Kingston Vale (1 mile north-east), Norbiton (1 mile south-west) and New Malden (1 mile south). Larger places within reach include London (9 miles north-east), City of Westminster (8 miles north-east), Marylebone (8 miles north-east), Kensington (6 miles north-east), St Pancras (10 miles north-east) and Shoreditch (11 miles north-east).
Around Coombe
We work in homes and buildings around Canbury School, Coombe Girls' School and The Royal Oak Public House, among other places. The closest station to Coombe is Norbiton station, roughly 1 mile south-west of the centre. Other landmarks nearby include Bentall Centre (1.8 miles west) and White Lodge Museum (1.8 miles north). Green spaces nearby include Kew Gardens Lake and Kingston Hill Road area.
What affects the quote in Coombe
Jobs vary more than people expect. The main factors:
- The old material and how stubborn it is
- Any working-time requirements on site
- The number of rooms or windows
- Whether there’s mould to deal with
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
Helping us quote
To make quoting easier, let us know:
- Any access issues, like height or stairs
- Pictures of the joints, sent by email
- The problem you’ve noticed
- Whether it has been sealed before
There’s no standard price list. Instead, we give you a clear quote for your job. To get started, ring 0345 464 0079 or send us an email.
Signs you need new build mastic in Coombe
Sealant applied onto damp surfaces does not bond well. Site programmes don’t always leave time for joints to dry.
It’s worth asking for a quote if you see:
- New-build shower sealant that has already split
- Beads laid onto grit and dust from the build
- Second-fix sealing on new plots
- Cracked sealant around new window and door frames
Coombe is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What to look for in a quote
- How the colour is chosen
- How hidden problems are handled
- How long to leave it before use
- Whether they’re fully insured
What else we do in Coombe
Leave it or put it right?
Water getting past a failed seal in a new build reaches walls and floors that are still settling. Dealing with it early keeps the damage away from ceilings, floors and finishes. In a flat in Coombe, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What you get with us
- Sanitary silicone with an anti-fungal additive in wet areas
- Sealant colour chosen to suit
- Domestic, commercial and hotel work
- Quality sealants from Arbo and Everbuild
Take a look at what affects the cost or customer reviews.
Should I try it myself first?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Aftercare tips
Aftercare is simple, and it makes a real difference:
- Open a window or run the fan after bathing
- Watch for new gaps as the house dries out
- Do not wait for the house to settle if water is getting through
- Keep pictures and emails about snagging items
Don’t stand on the bath edge or the lip of the tray while the sealant cures. If a bath or tray moves when you stand in it, get it looked at.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Early resealing keeps the job small and protects the rest of the house.
The process
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. 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 Coombe. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out, with no layer left behind.
- We clean out the dust and grit left from the build.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Tell us about any water getting in
- Clear the area around the work
Ask for a quote
We quote each job on its own, so start by telling us what you need. Just ring 0345 464 0079 or email us with the details.