Greater London · England
New-build mastic & snagging in Penge, Greater London
Plot mastic for developers and snagging failed sealant in new homes for homeowners, landlords and businesses in Penge. Fully insured, ARBOMaster approved and guaranteed for a year.
- Untidy sealant flagged on a snagging list
- Cracked caulk along new skirting
- Leaking shower tray seals in a new home
What affects the cost of new build mastic
You’ll get a clear quote before we start. It’s based on:
- How many areas need sealing
- The number and length of the joints
- Which sealant suits the joint
- How much old sealant there is and how hard it is to remove
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we will explain what it covers.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- What’s wrong with the joints now
- A few pictures by email, if you can
- If it’s domestic, commercial or a hotel
- Roughly how big the job is
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or drop us an email.
New build mastic in Penge
If your new home has a leaking shower seal, open skirting joints or untidy sealant, we can help. While the builder’s snagging or warranty period runs, report it to them first and if that stalls, we can do it. If you have messy sealant that spoils new finishes and cracked caulk along new skirting, we can help, on windows & doors, bathrooms & en suites and skirting & floors alike.
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.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Penge (SE20, SE19, SE26)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Penge
Other services in Penge
New homes and floors in Penge
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. Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent.
For new homes near Penge West station, it’s worth checking the sealant early, while snags are still fresh.
Penge is about 1 mile west of Beckenham, in Greater London. For new build mastic in and around Penge, please phone 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover Greater London, Penge included. We cover 764 towns and villages across Greater London, from the larger towns to small villages. London is on our list too, around 6 miles away.
Jobs for new build mastic in SE20, SE19 and SE26 works the same way as everywhere else we cover. Local streets include High Street, Anerley Station Road and Station Road. With the A234 close by, Penge is easy for our applicators to reach. Neighbouring places we cover for new build mastic include Anerley (1 mile west), Crystal Palace (1 mile north-west), Sydenham (1 mile north), Gipsy Hill (1 mile north-west) and Upper Norwood (1 mile west). Within a short drive, we also cover London (6 miles north), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (8 miles north-west), St Pancras (8 miles north) and Shoreditch (8 miles north).
Local landmarks in Penge
Typical jobs here are in homes near Crystal Palace School, Crooked Billet pub and Crystal Palace Dinosaurs, among other places. There’s a railway station in Penge itself: Penge West station. Nearby you will also find St Christopher's Hospice (0.5 miles north) and Crystal Palace Museum (0.8 miles north-west). Open spaces near Penge include Dulwich Upper Wood and Knight's Hill.
Landlords, agents and businesses in Penge
For anyone letting property in or around Penge, several properties can go on one quote. Just tell us the addresses and what each one needs.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
What we cannot put right
To be straight with you, there are a few things sealant won’t fix:
- Broken tiles or a split tray
- Deciding who is responsible under a builder’s warranty
- Leaks from pipes, valves or wastes, which need a plumber
If in doubt, call 0345 464 0079 or email us and we will say what we think.
What we seal
- Show homes
- Bathrooms & en suites
- Plot handovers
- Skirting & floors
- Windows & doors
- Kitchens
Looking after it afterwards
After the cure time, these simple habits help:
- Keep pictures and emails about snagging items
- Wait for the cure time before using a resealed shower
- Don’t seal over failed sealant yourself
- Watch for new gaps as the house dries out
Keep pictures of the joints and any snagging correspondence with your builder. It helps if anything else comes up during the warranty period.
Lifting sealant traps moisture and mould behind it. Resealing before mould gets in saves a harder job later.
FAQs for Penge
Can parking be tricky for a visit in Penge?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Do you cover Penge for new build mastic?
Yes. We work across London and the South East, and Penge is part of that. You can ring 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear quote.
Are you fully insured?
Yes. We are fully insured for domestic and commercial work.
How do I get a quote for new build mastic in Penge?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or send us an email with a short description of the job.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in.
Is it worth resealing while the house is still settling?
If the seal has failed and water is getting in, do it now. Hairline cosmetic gaps can wait until the house has settled.
Can you reseal over the builder’s sealant?
No. The old sealant is cut out fully, then clean and prime the joint, and a new bead applied.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
The process
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and tidy away. It normally takes a few hours in a single home. In Penge, as in most of London, parking needs a little planning. 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 down to clean surfaces.
- Joints are vacuumed and cleaned of building dust.
- We prime where needed and apply a sealant suited to each joint.
- We tool every joint neatly and tell you when each area can be used.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Clear the area around the work
- Mention any sign-in or site rules at work premises
How to get a quote
For a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
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Common problems we fix in Penge
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.
People normally contact us after spotting one of these:
- Gaps opening as the house dries out and settles
- Worktop and upstand sealant coming away
- Skirting joints opening in the first winter
- Plot mastic for developers ahead of handover
Penge is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Before booking anyone
- When the joint can take water or movement
- How the colour is chosen
- How hidden problems are handled
- What preparation is included
Should I try it myself first?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.