Greater London · England
New Build Mastic in Bellingham
Plot mastic for developers and snagging failed sealant in new homes for Bellingham, backed by a 12-month guarantee. Call for a quick quote.
- Worktop and upstand sealant coming away
- Messy sealant that spoils new finishes
- Cracks appearing as a new home settles
What the job involves on each surface
Plot handovers
Good preparation at handover saves snagging later. We clean out building dust before sealing and primer used where needed.
Skirting and floors
Gaps under skirting are one of the most common new-build snags. A flexible sealant closes it without cracking like caulk.
New build mastic for homes and businesses in Bellingham
In a new home, every joint should have a clean, even bead. Smeared, patchy or cracked sealant is worth sorting early, before water reaches anything behind it. Common call-outs are for cracks appearing as a new home settles and sealant work across a run of new homes, across plot handovers, show homes and windows & doors.
Across London, commercial floors have movement joints that break down under heavy foot traffic, while new homes need a neat, sound finish around frames, baths and kitchens before handover.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- Bellingham (SE6, SE26, SE23)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Bellingham
More services for Bellingham
Joints and finishes in Bellingham homes
London and the South East are among the drier parts 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 snags may need reporting through the developer or the managing agent.
If you’ve bought a new home near Bellingham station, the sealant around baths, showers and frames is worth checking in the first year or two. As a London address, Bellingham can be tricky for parking: let us know about parking bays, permits or a driveway.
Bellingham is about 2 miles north of Beckenham, in Greater London. Whether you are in the middle of Bellingham or further out, we cover new build mastic for every kind of property. Bellingham is one of 764 towns and villages in Greater London where we work. We also work in London, around 6 miles away.
Postcode districts we cover here for new build mastic: SE6, SE26 and SE23. You’ll find streets such as Oslac Road, Orford Road and Aitken Road, all of which we cover. Bellingham is on the A2218, which makes it straightforward to reach. We also cover Southend (1 mile north), Bell Green (1 mile west), Catford (1 mile north-east), Perry Vale (1 mile west) and Sydenham (1 mile west). Larger places within reach include London (6 miles north-west), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (9 miles north-west), St Pancras (8 miles north-west) and Shoreditch (7 miles north).
Around Bellingham
In Bellingham, that means homes and buildings near Sedgehill School, Forster Memorial Park and Allenby Tutorial Trust and the streets around them. There’s a railway station in Bellingham itself: Bellingham station. A little further out are Prefab Museum (1 mile east) and University Hospital Lewisham (1.6 miles north). For a walk, there’s Downham Woodland Walk and Knight's Hill.
Questions from Bellingham
Can you do new build mastic in Bellingham?
Yes. We work across London and the South East, and Bellingham is part of that. Just call 0345 464 0079 or email us with a few details of the job.
I let a flat near Bellingham station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can be quoted together. You can call 0345 464 0079 or email us with the details for a clear quote.
Should I try DIY first?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Can new sealant go on top of the old bead?
No. Fresh silicone does not stick to the old layer, so sealing over the top fails quickly. We cut the old bead out completely.
Why has my new-build shower seal failed already?
New homes dry out and move in their first couple of years, and sealant is often rushed onto dusty, unprimed surfaces. Either can make it fail early.
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.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
How long does new build mastic take?
A typical job takes a few hours for most snagging lists, longer for a run of plots. We will confirm how long when we quote.
What sealant work cannot fix
We’ll always be straight with you, so here’s what new sealant won’t do:
- Cracked trays, tiles or worktops
- Your warranty claim itself, which is between you and the builder
- Structural cracks in walls or ceilings
If you’re not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer before booking.
Joints and surfaces we work on
- Plot handovers
- Show homes
- Kitchens
- Windows & doors
- Bathrooms & en suites
- Skirting & floors
How to look after the new joints
No joint lasts for ever, but care makes a real difference. Our tips:
- Record problems with dated photos
- Don’t seal over failed sealant yourself
- Keep water off fresh sealant until it has cured
- Avoid scourers and strong chemicals on sealant
Keep photos of the joints and any snagging correspondence with your builder. It helps if anything else comes up during the warranty period.
Early snagging is easier snagging. Left alone, a small crack can become a leak in a busy bathroom.
Landlords, agents and businesses in Bellingham
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we are fully insured.
The process
We bring everything the job needs with us. Once we have agreed what’s being done, we protect the area and start. Most jobs take a few hours in a single home. For a job in Bellingham, 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.
- Each joint is checked for movement before we start.
- We remove the failed sealant and clean the joints.
- Joints are dried and primed where the product calls for it.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- We check every joint and leave you with the cure times.
Getting ready for the visit
- Tell us about any water getting in
- Tell us about any previous sealing or DIY attempts
- For business premises, tell us about site rules or sign-in
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you are ready, phone 0345 464 0079 or send us an email.
Read more
What happens if it’s left?
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 London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble.
Doing several joints on one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Why Bellingham clients choose us
- 180+ five-star Google reviews
- We never seal over old sealant
- We are fully insured
- Tidy, careful work
Read our cost guide and our reviews.
Quotes for new build mastic in Bellingham
Every job gets its own quote. These are the things that affect it:
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- The product the joint needs
- Whether there’s mould to deal with
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it has been sealed before
- The type of property
- Where the job is, and your postcode
If you are in Bellingham and need new build mastic, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.