Greater London · England
New Build Mastic in Brockley
Professional new build mastic in and around Brockley, with old sealant always removed completely and a one-year guarantee.
- Untidy sealant flagged on a snagging list
- New-build shower sealant that has already split
- Internal frame sealant that has split
About our new build mastic in Brockley
Building dust is behind a lot of failed new-build sealant. We clean every joint thoroughly and prime where the surface and product need it, so the new bead bonds properly rather than sitting on a layer of grit. We’re often asked to deal with cracks appearing as a new home settles and kitchen sealant that has pulled off the wall, on plot handovers, bathrooms & en suites and windows & doors.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Every joint between floor, skirting and threshold has to cope with some movement.
Big or small, you get the same one-year guarantee.
- Place
- Brockley (SE4, SE23, SE6)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need new build mastic in Brockley
The first winter with the heating on dries a new home quickly. Skirting, frames and worktops pull away slightly and cracked sealant shows up.
The problems people generally mention when they call are:
- Sealant applied over dusty or wet surfaces
- Kitchen sealant that has pulled off the wall
- Joints pulling apart as timber shrinks
- Skirting joints opening in the first winter
If you’ve bought a new home near Crofton Park station, the sealant around baths, showers and frames is worth checking in the first year or two.
Before booking anyone
- What the cure time is
- Whether the sealant suits the joint
- Are they insured?
- Whether all the old sealant comes out first
What sealant work cannot fix
Sealant isn’t the answer to every problem, and we’d rather say so up front. It won’t solve:
- Damaged fittings that need replacing
- Movement caused by a poorly fitted tray or bath
- Cracking that points to a structural problem
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Skirting & floors
- Bathrooms & en suites
- Kitchens
- Windows & doors
- Show homes
- Plot handovers
Nearby places to Brockley
Other services in Brockley
What happens on the day
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself usually takes a few hours in a single home, depending on how much there is to do. For a job in Brockley, parking and access are the things to plan: 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.
- Old sealant is cut out and the joints cleaned.
- We make sure the joints are dry and prime them if needed.
- Baths are filled with water, then the new sealant is applied.
- We check every joint and leave you with the cure times.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
- Mention any tricky access
Getting a quote
Want a quote for new build mastic? Please ring 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
Quotes for new build mastic in Brockley
We don’t publish a price list, because jobs vary so much. The quote depends on:
- The size of the job
- When we can work, for business premises
- The product the joint needs
- Whether there’s mould to deal with
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Helping us quote
To help us quote quickly, let us know:
- The type of property
- How many joints, rooms or windows are involved
- If someone has resealed it before
- How we’d reach the joints
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we’ll explain what’s involved.
Landlords, agents and businesses in Brockley
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
For anyone letting property in or around Brockley, several properties can go on one quote. Send us the addresses and the work at each.
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Use the extractor fan every time you shower
- Don’t seal over failed sealant yourself
- Record problems with dated pictures
- Don’t wait for the house to settle if water is getting through
Wipe the sealant with warm soapy water. Keep scourers and harsh chemicals off it as they wear the bead.
Early snagging is easier snagging. Small faults turn into leaks if left over time.
Why deal with it now?
For developers, getting the sealant right first time saves return visits. Every return visit for a failed seal takes time. 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. Dealing with it early is far simpler for homes in Brockley.
What it costs depends on the amount of work, how much old material has to come out and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
Why choose Mr Mastic in Brockley
- White, clear, grey or coloured to suit, where the product allows
- Full insurance on every job
- ARBOMaster approved applicator
- One-year guarantee on every job
Your questions about new build mastic in Brockley
Can you do new build mastic in Brockley?
Yes. Our work covers London and the South East, and Brockley is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
I let a flat near Crofton Park station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
What should I tell you?
Just the basics: where it is, what you’ve noticed and how we reach it. After that, simply phone 0345 464 0079 or email us.
Do you do commercial work?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
What colour sealant will you use?
The colour is chosen to suit the tiles, worktop or frame. Let us know your preference when you ask for a quote.
How long will you be here?
That depends on the amount of work, but most jobs take a few hours for most snagging lists, longer for a run of plots. We will tell you when we quote.
Do you work through snagging lists?
Yes. Send the list and a few photos of the sealant items. We will tell you if anything on it is not a sealant job.
Why does sealant fail so quickly in new builds?
A new house dries and settles for a year or two, and sealant is often applied quickly onto dusty surfaces. Either can make it fail early.
What new build mastic looks like in Brockley
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. Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent.
As a London address, Brockley can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Brockley is about 1 mile south of New Cross, in Greater London. From the centre of Brockley to the outskirts, we cover new build mastic for every kind of property, from flats and houses to offices and hotels. We cover 764 towns and villages across Greater London.
Our applicators cover all of the SE4, SE23 and SE6 postcode area for new build mastic. You will find streets such as Ivy Road, Nash Road and Lindal Road, all of which we cover. Nearby, we also carry out new build mastic in Crofton Park (1 mile south-east), Honor Oak (1 mile west), Ladywell (1 mile east), Forest Hill (1 mile south-west) and Nunhead (1 mile north-west). We also work in nearby towns such as London (4 miles north-west), City of Westminster (7 miles north-west), Marylebone (7 miles north-west), Kensington (8 miles north-west), St Pancras (6 miles north-west) and Shoreditch (5 miles north).
Near you in Brockley
Locally, jobs take us to homes and businesses close to Blythe Hill Tavern, Allenby Tutorial Trust and Blythe Hill Fields. Brockley has its own railway station: Crofton Park station. Other landmarks nearby include Horniman Museum and Gardens (1.4 miles south-west) and University Hospital Lewisham (0.7 miles east). For a walk, there’s One Tree Hill and Knight's Hill.