Greater London · England
Avery Hill New Build Mastic
Our applicators work in Avery Hill on plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Worktop and upstand sealant coming away
- Sealant that never bonded to the surface
- Sealant work across a run of new homes
How the job changes by surface
Bathrooms and en suites
Trays and baths in new builds settle as they’re used. The joint is stripped back before the new bead goes in with baths filled first.
Show homes
Tired or marked sealant in a show home can be renewed. The old bead comes out and a clean new one goes in.
How we handle new build mastic in Avery Hill
Our new-build work comes in two parts: plot mastic for developers, and putting right failed sealant for people who’ve bought a new home. Both get the same care over preparation since hurried prep is behind a lot of new-build failures. We work on skirting & floors, show homes and windows & doors, and people most often call us about sealant work across a run of new homes and beads laid onto grit and dust from the build.
Much of London’s new housing is flats 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.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Where
- Avery Hill (SE9, DA15, DA16)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Places near Avery Hill
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What happens on the day
A visit follows a simple pattern: we check the joints, protect the area around them, do the work and tidy away. It generally takes anything from a few hours to several days, depending on the number of plots. In a London area like Avery Hill, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We look at why each joint failed, including any movement.
- 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.
- The finished joints are checked and the cure times given.
Preparing for the visit
- Clear items away from the joints we’re working on
- On commercial sites, let us know about site rules
- Tell us about any previous sealing or DIY attempts
Get a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work and give you a clear price.
Advice
Why it’s worth doing now in Avery Hill
Resealing everything on a snagging list in one visit is usually simpler than chasing joints one at a time. You get one visit and one clear quote. 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.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why choose Mr Mastic in Avery Hill
- Neat joints and a tidy finish
- ARBOMaster approved applicator
- You choose the colour before work begins
- Anti-fungal silicone where joints get wet
Take a look at how sealant jobs are priced and our reviews.
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Avoid running a DIY bead over the old one
- Ventilate bathrooms well, especially in the first year
- Keep water off fresh sealant until it has cured
- Get a leaking seal dealt with right away
Wipe the sealant with warm soapy water. Avoid abrasive pads and strong solvents.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Catching it early keeps the fix to the sealant and the new finishes intact.
New build mastic in Avery Hill: local notes
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent.
Avery Hill is in London, so parking needs planning: let us know about parking bays, permits or a driveway. For new homes near Falconwood station, it’s worth checking the sealant early, while snags are still fresh.
Avery Hill is about 1 mile north-east of Eltham, in Greater London. Wherever you are in the SE9 postcode area, we cover new build mastic for homes and businesses. We cover 764 towns and villages across Greater London. For nearby work, see our London page (8 miles or so).
We cover every part of SE9, DA15 and DA16 for new build mastic. Whether your property is on Bexley Road, Glenure Road and Perpins Road or a nearby road, we can help. Avery Hill sits on or near the A210. We also cover the places around Avery Hill: Blackfen (1 mile east), Eltham (1 mile south-west), New Eltham (1 mile south), Falconwood (1 mile north-east) and Well Hall (1 mile west). Within a short drive, we also cover London (8 miles north-west), City of Westminster (11 miles north-west), Marylebone (11 miles north-west), Kensington (12 miles west), St Pancras (10 miles north-west) and Shoreditch (8 miles north-west).
Near you in Avery Hill
Typical jobs here are in homes near Shoulder of Mutton Green and Alderwood Primary School, among other places. Avery Hill’s nearest station is Falconwood station, about 0.6 miles north of the centre. A little further out are Greenwich Castle (3.8 miles north-west) and Metropolitan Police Museum (1.7 miles south-east). For a walk, there’s Summer Hill and The Tarn.
Questions from Avery Hill
Do you work for landlords with property near Falconwood station?
Yes. We work for letting agents and landlords as well as homeowners. You can ring 0345 464 0079 or email us with the details for a clear quote.
Is parking an issue for new build mastic in Avery Hill?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you guarantee your work?
Yes. All our work carries a one-year guarantee.
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.
Do you work in Avery Hill?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland, Avery Hill included.
Can you match the sealant colour to my new kitchen or bathroom?
That depends on what the joint meets: white or clear in most bathrooms, and a colour to suit worktops, frames and floors elsewhere. We agree the colour before work begins.
Why does sealant fail so quickly in new builds?
It’s common, and there are generally two reasons: movement as the house dries and settles, and sealant laid onto dust without primer. Cutting it out and resealing properly fixes both.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures.
Quotes for new build mastic in Avery Hill
Some jobs are bigger than they look, and some smaller. The main factors:
- How easy the joints are to reach
- The size of the job
- Whether there’s mould to deal with
- How many areas need sealing
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
Asking for a quote
To make quoting easier, please include:
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it has been sealed before
- Access, such as stairs, a lift or height
- Where the property is
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
What sealant work cannot fix
New sealant can’t fix everything, and we will tell you before any work starts. It will not solve:
- Your warranty claim itself, which is between you and the builder
- Cracked trays, tiles or worktops
- Cracking that points to a structural problem
If in doubt, ring 0345 464 0079 or email us and we will say what we think before you book.
Joints and surfaces we work on
- Plot handovers
- Skirting & floors
- Windows & doors
- Kitchens
- Bathrooms & en suites
- Show homes
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
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 doesn’t work out, we can still put it right.