Greater London · England
New-build mastic & snagging in Woodside, Greater London
Plot mastic for developers and snagging failed sealant in new homes for homeowners, landlords and businesses in Woodside. Fully insured, ARBOMaster approved and guaranteed for a year.
- Sealant applied over dusty or wet surfaces
- Internal frame sealant that has split
- Joints pulling apart as timber shrinks
Why it’s worth doing now in Woodside
A failed shower or bath seal in a new home lets water into floors and walls that are still drying out. Dealing with it early keeps the damage away from ceilings, floors and finishes. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Woodside, the repair is bigger than a sealant job.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why book with us
- Old sealant always removed completely
- Homes, businesses and hotels
- Fully insured
- Colour agreed with you before any work starts
How we handle new build mastic in Woodside
For builders and developers, we work through plots to the schedule you give us. We seal bathrooms, kitchens, windows, doors and skirting so plots are ready to hand over using the right product for each joint. If you’re dealing with second-fix sealing on new plots and gaps opening as the house dries out and settles, we can put it right, on plot handovers, kitchens and skirting & floors alike.
New flats are going up across London, many of them in larger developments. Snagging there often goes through the developer or managing agent, and failed shower seals, open skirting joints and gaps at thresholds are typical.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Woodside (CR0, SE25, CR9)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Kitchens
Sink joints are wet all the time. We use a sealant suited to kitchens suited to the job.
Bathrooms and en suites
Trays and baths in new builds settle as they’re used. The joint is stripped back before the new bead goes in with baths filled first.
Common problems we fix in Woodside
The first winter with the heating on dries a new home quickly. Gaps open along skirting, frames and worktops and cracks appear in the sealant.
The most common problems we see are:
- Sealant applied over dusty or wet surfaces
- Cracks appearing as a new home settles
- Untidy sealant flagged on a snagging list
- Kitchen sealant that has pulled off the wall
Woodside is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Before booking anyone
- What the cure time is
- Is the old sealant removed completely?
- Are they insured?
- Whether you can choose the colour
What we can’t put right
To be straight with you, some problems need a different trade:
- Structural cracks in walls or ceilings
- Disputes or warranty claims with your builder
- Damaged fittings that need replacing
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before booking.
Joints and surfaces we work on
- Plot handovers
- Show homes
- Windows & doors
- Skirting & floors
- Kitchens
- Bathrooms & en suites
Joints and finishes in Woodside homes
Compared with the north and west, the South East gets less rain, 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.
If you’ve bought a new home near Norwood Junction station, the sealant around baths, showers and frames is worth checking in the first year or two.
Woodside is about 6 miles south of New Cross, in Greater London. From the centre of Woodside to the outskirts, new build mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our area takes in 764 places across Greater London, large and small. Our London page covers work nearby, about 8 miles away.
Here we cover the CR0, SE25 and CR9 postcode area for new build mastic. Whether your property is on Long Lane, Tudor Road and Coe Avenue or a nearby road, our applicators can take on the job. Other places close to Woodside include Ashburton (1 mile south), Addiscombe (1 mile south), Shirley Oaks (1 mile south-east), Monks Orchard (1 mile south-east) and Shirley (1 mile south-east). We also work in nearby towns such as London (8 miles north), City of Westminster (9 miles north-west), Marylebone (10 miles north), Kensington (10 miles north-west), St Pancras (10 miles north) and Shoreditch (10 miles north).
Local landmarks in Woodside
Typical jobs here are in homes near The Beehive pub, Oasis Academy Shirley Park and Ashburton Park. For rail, the closest station is Norwood Junction station, roughly 0.7 miles north-west. Other landmarks nearby include Whitgift Centre (1.7 miles south-west) and Crystal Palace Museum (2.2 miles north). Open spaces near Woodside include Bramley Bank and Duppas Hill.
How the visit works
We keep the work tidy and contained to the joints we’re treating. Expect the work to take anything from a few hours to several days, depending on the number of plots, and we explain the cure time before we leave. 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.
- We start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- We cut out every bit of the failed or messy sealant.
- Surfaces are cleaned of building dust and primed where needed.
- New sealant suited to each joint is applied and tooled neatly.
- We check every joint and tell you how long each needs to cure.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- On commercial sites, let us know about site rules
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
Related advice
Can I do it myself?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Work for landlords, hotels and businesses
We work for landlords and letting agents as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
If you manage several properties in or around Woodside, several properties can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.
Your questions about new build mastic in Woodside
Do you cover Woodside for new build mastic?
Yes, Woodside is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
I let a flat near Norwood Junction station. Can you help?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
What should I tell you?
Tell us what needs doing and where, plus photos if you have them. We’ll ask anything else we need to know.
How long does the job take?
As a guide, most jobs take a few hours in a single home. Bigger jobs take longer, and we will say how long yours will take.
Do you remove the old sealant?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
What colour sealant will you use?
The colour is chosen to suit the tiles, worktop or frame. Let us know your preference when you ask for a quote.
When is the best time to reseal in a new build?
Where water is getting through, don’t wait. Hairline cosmetic gaps can wait until the house has settled.
Where is Mr Mastic based?
We’re a Crawley-based firm. We work across South East England, London and Scotland.