Greater London · England
Welling New Build Mastic
New build mastic in Welling from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Cracked sealant around new window and door frames
- Gaps between new skirting and floors
- Sealant work across a run of new homes
New build mastic in Welling
We work in new homes and on new-build sites across Welling. Whether it’s one en suite or a run of plots, the method is the same: remove, clean, prime where needed, then a neat new bead. Typical jobs include gaps behind new kitchen upstands and shower seals failing in the first year or two, on kitchens, plot handovers and windows & doors.
New flats are going up across London, many of them in larger developments. Snagging there often goes through the developer or managing agent, and shower seals that fail early, skirting joints that open up and gaps at thresholds are all common snags.
Each job carries a 12-month guarantee, whatever its size.
- Place
- Welling (DA16, DA15, DA6)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
On the day, we start by going over the job with you, so you know exactly what we’re doing. We protect the surfaces around the joints before any work begins. Most jobs take anything from a few hours to several days, depending on the number of plots. In Welling, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- Every bit of the old builder’s sealant is cut out, with no layer left behind.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
Before we arrive
- Mention if the joints have been sealed before
- Let us know about stairs, lifts or work at height
- Try not to wet indoor joints just before the visit
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you are ready, call 0345 464 0079 or email us.
Advice
Landlords, agents and businesses in Welling
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
We work for landlords and agents as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
Do you need new build mastic in Welling?
New homes are full of moisture from plaster, screed and concrete, which takes a year or two to dry out. Drying timber shrinks and pulls joints apart.
Common reasons people contact us are:
- Plot mastic for developers ahead of handover
- Gaps between new skirting and floors
- Internal frame sealant that has split
- Gaps opening as the house dries out and settles
As a London address, Welling can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before you book
- What guarantee comes with the work
- Whether you can choose the colour
- What insurance they hold
- Whether VAT is included
New build mastic in Welling: local notes
Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent. 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.
If you’ve bought a new home near Welling station, the sealant around baths, showers and frames is worth checking in the first year or two.
Welling is about 9 miles east of London, in Greater London. Homes, rented property, offices and hotels in Welling is covered for new build mastic. Every job comes with our 12-month guarantee. Welling is one of 764 towns and villages in Greater London where we work for new build mastic. You can also see our page for London, about 9 miles away.
Every address in DA16, DA15 and DA6 is within our area for new build mastic. Whether your property is on Days Lane, Hook Lane and Lyme Road or anywhere close by, we can help. Main roads around Welling include the A207, which makes travel easy. Neighbouring places we cover for new build mastic include Crook Log (1 mile east), Blendon (1 mile south-east), Upton (1 mile east), Bexleyheath (1 mile east) and West Heath (1 mile north-east). Further out, we also cover London (9 miles west), City of Westminster (12 miles west), Marylebone (12 miles west), Kensington (14 miles west), St Pancras (11 miles north-west) and Shoreditch (9 miles north-west).
Near you in Welling
We work in homes and buildings around Nags Head pub, Danson Park and Bexley Grammar School. Welling’s nearest station is Welling station, roughly 0.5 miles north-west. Well-known places in the area include Greenwich Castle (5 miles west) and Broadway Shopping Centre (1.6 miles east). Open spaces near Welling include The Tarn and Summer Hill.
What affects the cost of new build mastic
The price is agreed before any work begins. It’s based on:
- The product the joint needs
- Working hours on commercial sites
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Helping us quote
Before you ask for a quote, have a think about:
- What’s wrong with the joints now
- Any access issues, like height or stairs
- If someone has resealed it before
- Where the job is, and your postcode
Getting a quote is simple: let us know the job and the location and its rough size. A few pictures by email make the job easier to understand.
Towns and villages near Welling
Other services in Welling
What we cannot put right
In fairness, there are a few things sealant will not fix:
- Broken tiles or a split tray
- Structural cracks in walls or ceilings
- Leaks from pipes, valves or wastes, which need a plumber
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
Where we work in Welling
- Windows & doors
- Plot handovers
- Kitchens
- Bathrooms & en suites
- Show homes
- Skirting & floors
DIY versus a professional finish
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Looking after it afterwards
Aftercare is simple, and it makes a real difference:
- Put sealant faults on your snagging list early
- Ventilate bathrooms well, especially in the first year
- Keep photos and emails about snagging items
- Clean sealant with mild detergent, not abrasives
Keep an eye on the joints over the first couple of years. Small gaps can appear as the house dries and can be resealed later.
A seal that splits early is often a sign of movement. Getting it resealed properly, and any movement checked, stops it recurring.
FAQs for Welling
Do you work for landlords with property near Welling station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Is Welling in your area for new build mastic?
Yes, Welling is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or drop us an email and let us know what needs doing.
How much does new build mastic cost in Welling?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You will get a clear quote before we start.
Why has my new-build shower seal failed already?
A new house dries and settles for a year or two, and sealant is often rushed onto dusty, unprimed surfaces. Both lead to early failure.
Can you work from my snagging list?
Yes. Send it with pictures and we will quote for the sealant items. If something is not sealant, we will say so.
Will it make a mess?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
Where do you work from?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Can you work on commercial sites?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.