Greater London · England
New Build Mastic in Beckenham
New-build sealant joints in Beckenham need attention? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Second-fix sealing on new plots
- Beads laid onto grit and dust from the build
- Cracks appearing as a new home settles
About our new build mastic in Beckenham
In a new home, every joint should have a clean, even bead. When the finish is smeared, patchy or already cracking, it’s worth putting right early, before water gets into the floor or walls. We work on plot handovers, bathrooms & en suites and kitchens, and people most often call us about gaps between new skirting and floors and frame joints opening as the plaster dries.
London homes range from new-build flats to period conversions with new floors laid over old boards. Wherever a floor meets a wall, a skirting or a threshold, the joint has to allow for movement.
Your job is guaranteed for a year, as with all our work.
- Where
- Beckenham (BR3, SE26, BR4, SE20)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
When something else is needed
Before booking, it’s worth knowing the limits:
- Leaks from pipes, valves or wastes, which need a plumber
- Structural cracks in walls or ceilings
- A tray or bath that isn’t properly supported, until it’s fixed
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Plot handovers
- Kitchens
- Bathrooms & en suites
- Windows & doors
- Skirting & floors
- Show homes
How the visit works
We bring everything the job needs with us, so you do not need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. It normally takes a few hours in a single home. In a London area like Beckenham, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- The old bead comes out in full, with no layer left behind.
- We clean off dust from the build and prime the surfaces where the product needs it.
- New sealant suited to each joint is applied and tooled neatly.
- Finally, each room is checked and you’re given the cure time.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Let us know about parking restrictions
- Keep children and pets away from the work area
Getting a quote
Want a quote for new build mastic? Please call 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear quote before work begins.
Advice
Nearby places to Beckenham
Also in Beckenham
Keeping the joints in good condition
So the new joints stay in good condition:
- Avoid scourers and strong chemicals on sealant
- Act quickly if a seal starts to leak
- Report sealant problems to your builder during the snagging period
- Don’t seal over failed sealant yourself
Keep photos of the joints and any snagging correspondence with your builder. It helps if anything else comes up during the warranty period.
A seal that splits early is often a sign of movement. Have it resealed, and the tray or bath checked, before it gets worse.
Questions from Beckenham
Is Beckenham in your area for new build mastic?
Yes, Beckenham is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job.
Do you work for landlords with property near Beckenham Junction station?
Yes, we work for landlords and letting agents. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Do you use white or clear sealant?
White and clear are the most common, but sealant comes in other colours too. We match the colour to the finish before we begin.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will explain our choice.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator and we’re fully insured too.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Landlords, agents and businesses in Beckenham
If you manage several properties in or around Beckenham, several properties can be quoted together. Send us the addresses and the work at each, and pictures by email help.
We also work for property managers and facilities teams. We can quote a run of properties together, and we are fully insured.
What new build mastic looks like in Beckenham
Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent. 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.
Beckenham is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Beckenham is about 7 miles south-east of London, in Greater London. For new build mastic in and around Beckenham, it’s easy to get a quote: please call 0345 464 0079 or email us. We cover Greater London from our Crawley base, Beckenham included. Our area takes in 764 places across Greater London. You can also see our page for London, roughly 7 miles from Beckenham.
We work across BR3, SE26, BR4 and SE20 for new build mastic. If you need new build mastic at a property on High Street, The Drive and Stanmore Terrace or anywhere close by, our applicators can take on the job. Beckenham sits on or near the B230 and B251, which makes travel easy. We also cover Penge (1 mile west), Bell Green (2 miles north), Bellingham (2 miles north), Southend (2 miles north) and Sydenham (2 miles north-west). Further out, we also cover London (7 miles north-west), City of Westminster (9 miles north-west), Marylebone (9 miles north-west), Kensington (10 miles north-west), St Pancras (9 miles north-west) and Shoreditch (8 miles north).
Local landmarks in Beckenham
Typical jobs here are in homes near Harris Academy Beckenham, Beckenham Place Park and The George Inn. There’s a railway station in Beckenham itself: Beckenham Junction station. Nearby you’ll also find Greenwich Castle (5 miles north) and The Glades (1.9 miles east). Not far away are Summer Hill and Dacres Wood.
Common problems we fix in Beckenham
Not every new-build joint gets the right sealant: decorators’ caulk in a wet area, or a stiff sealant where there’s movement. Both fail early.
Any of these means the joints need attention:
- Shower seals failing in the first year or two
- Gaps between new skirting and floors
- Plot mastic for developers ahead of handover
- Cracks appearing as a new home settles
For new homes near Beckenham Junction station, it’s worth checking the sealant early, while snags are still fresh.
What your quote should include
- What the cure time is
- Who does the work, and how experienced they are
- How the colour is chosen
- Whether they’re fully insured
What affects the cost of new build mastic
Call for a quick quote. What matters most is:
- The size of the job
- Working hours on commercial sites
- The product the joint needs
- How many areas need sealing
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, ring 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Asking for a quote
To make quoting easier, let us know:
- What’s wrong with the joints now
- A few photos by email, if you can
- Roughly how big the job is
- If someone has resealed it before
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work.
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.