Greater London · England
Raynes Park New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for householders, landlords and businesses in Raynes Park. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Skirting joints opening in the first winter
- Second-fix sealing on new plots
- Worktop and upstand sealant coming away
New build mastic for homes and businesses in Raynes Park
We never seal over a failed new-build bead. New silicone won’t bond to old silicone, so it all comes out before we clean, dry and reseal. Common call-outs are for worktop and upstand sealant coming away and plot mastic for developers ahead of handover, across skirting & floors, kitchens and plot handovers.
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.
A one-year guarantee comes as standard, so you are covered after we’ve gone.
- Location
- Raynes Park (SW20, KT3, SM4)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Follow the cure time we give you
- Avoid running a DIY bead over the old one
- Watch for new gaps as the house dries out
- Keep photos and emails about snagging items
Wipe the sealant with warm soapy water. Avoid abrasive pads and strong solvents, which can damage the surface.
Mould takes hold quickly in sealant that has gaps or lifted edges. Dealing with it before it goes black saves a harder job later.
Places near Raynes Park
Also in Raynes Park
Why deal with it now?
If you are 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 Raynes Park, the repair is bigger than the sealant job would have been.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
What you get with us
- Anti-fungal sanitary silicone in wet areas
- We’re fully insured
- We never seal over old sealant
- We agree the colour with you first
Take a look at our cost guide or customer reviews.
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
For anyone letting property in or around Raynes Park, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
Different surfaces, different methods
Bathrooms and en suites
Baths, showers, basins and trays in new bathrooms are the most common new-build reseal. The old sealant comes out and anti-fungal sanitary silicone goes in after cleaning and priming.
Skirting and floors
Wet-area floor joints need a flexible seal. They get a flexible, water-resistant sealant.
What we do, step by step
Once we’re on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours for most snagging lists, longer for a run of plots. For a job in Raynes Park, 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.
- We start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out.
- Joints are vacuumed and cleaned of building dust.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Mention any parking rules near the property
- Move anything stored near the joints
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.
Related advice
Signs you need new build mastic in Raynes Park
Once people move in, baths and trays take weight and bed down. A bath sealed empty drops slightly when filled, straining the joint and the sealant may split.
The problems people generally mention when they call include:
- Messy sealant that spoils new finishes
- Joints pulling apart as timber shrinks
- Cracked sealant around new window and door frames
- Kitchen sealant that has pulled off the wall
If you’ve bought a new home near Raynes Park station, the sealant around baths, showers and frames is worth checking in the first year or two.
What your quote should include
- How the colour is chosen
- What the quote includes, VAT included or not
- Are they insured?
- What guarantee comes with the work
Raynes Park: your questions answered
Is parking a problem for a job in Raynes Park?
Parking in Raynes Park, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
I let a flat near Raynes Park station. Can you help?
Yes. We work for landlords and letting agents as well as householders, and several properties can go on one quote. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Can you do plot mastic on a new development?
Yes. We seal plots to the developer’s programme ready for handover. Tell us the plots and the joints involved and we will quote.
Do you use white or clear sealant?
We use white, clear or a colour to suit the finishes. Tell us what you’d like when you get a quote.
What information do you need?
A short description and the location, plus photos if you have them. If we need more, we’ll ask.
Who should fix failed sealant in a new build?
Start with the builder if you’re in the snagging or warranty period. Once that’s done, or if they won’t put it right, we can reseal it properly.
Do you cover Raynes Park?
We do. Raynes Park is part of the area we cover, and the service is the same as everywhere else.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us.
New build mastic around Raynes Park
London and the South East are among the drier parts 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 snagging may go through the developer or managing agent.
As a London address, Raynes Park can be tricky for parking: let us know about parking bays, permits or a driveway.
Raynes Park is about 2 miles south-west of Wimbledon, in Greater London. We carry out new build mastic for homes and businesses in Raynes Park and the surrounding area, as part of our work across Greater London. Across Greater London, we cover 764 places, Raynes Park among them. We also work in London, about 9 miles from Raynes Park.
Jobs for new build mastic in SW20, KT3 and SM4 is quoted and booked the same way as anywhere else. That includes homes and businesses on Gore Road, Edna Road and Wyke Road and the roads around them. Being close to the A238 and A298, Raynes Park is simple for us to get to for new build mastic. Close by, we work in West Barnes (1 mile south-west), Bushey Mead (1 mile north-east), Cannon Hill (1 mile east), Motspur Park (1 mile north-west) and Wimbledon Chase (1 mile north-east). Larger places within reach include London (9 miles north-east), City of Westminster (8 miles north-east), Marylebone (9 miles north-east), Kensington (7 miles north), St Pancras (10 miles north-east) and Shoreditch (11 miles north-east).
Landmarks near Raynes Park
Locally, jobs take us to homes and businesses close to Raynes Park High School, The Raynes Park Tavern and Cannon Hill Common. Raynes Park has its own railway station: Raynes Park station. A little further out are Wimbledon Museum (1.5 miles north-east) and Atkinson Morley Hospital (1 mile north). Open spaces near Raynes Park include Henman Hill and Derwent Floodwash.