Greater London · England
New Build Mastic in Herne Hill
Specialist new build mastic for Herne Hill: careful preparation, the right product and tidy work. Call for a quick quote.
- Smeared, uneven beads picked up at snagging
- Sealant work across a run of new homes
- Gaps between new skirting and floors
New build mastic for homes and businesses in Herne Hill
For builders and developers, we work through plots to the schedule you give us. Bathrooms, en suites, kitchens, frames and skirting are sealed ready for handover. We’re often asked to deal with smeared, uneven beads picked up at snagging and cracked caulk along new skirting, on skirting & floors, bathrooms & en suites and show homes.
From brand-new flats to converted terraces with new flooring, London has every kind of floor. Wherever a floor meets a wall, a skirting or a threshold, the joint has to allow for movement, in Herne Hill as anywhere.
The work is covered for a year after we finish. If anything is not right with it, call 0345 464 0079 or drop us an email.
- Place
- Herne Hill (SE22, SW2, SE24)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Work for landlords, hotels and businesses
We work for letting agents and landlords as well as homeowners. Resealing between tenancies keeps a property looking cared for.
If you manage several properties in or around Herne Hill, several properties can go on one quote. Just tell us the addresses and what each one needs.
Places near Herne Hill
Other services in Herne Hill
Why act early in Herne Hill
If you are still in the builder’s snagging or warranty period, ask them to put it right first. If it keeps failing or isn’t dealt with, we can reseal it properly. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Herne Hill, the repair is bigger than the sealant job would have been.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
Why choose Mr Mastic in Herne Hill
- ARBOMaster approved applicator
- 20+ years of sealant experience
- Anti-fungal sanitary silicone in wet areas
- White, clear, grey or coloured to suit, where the product allows
Take a look at what affects the cost or customer reviews.
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Resist patching a failed seal with a tube from the DIY shop
- Report sealant problems to your builder during the snagging period
- Watch for new gaps as the house dries out
- Wait for the cure time before using a resealed shower
Keep pictures 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. Getting it resealed properly, and any movement checked, stops it recurring.
Different surfaces, different methods
Skirting and floors
Floors and skirting move as the house dries and the heating runs. Caulk cracks; a flexible sealant moves with it in a colour to suit.
Show homes
In a show home, the sealant is on display. Every bead is neat and coloured to suit the room.
Herne Hill: your questions answered
I let a flat near North Dulwich station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Is parking an issue for new build mastic in Herne Hill?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
When is the best time to reseal in a new build?
Any seal that’s leaking should be redone straight away. Cosmetic gaps can wait until the first year or two of movement has passed.
Can you work from my snagging list?
Yes. Photos of each sealant item help us quote. If something is not sealant, we’ll say so.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
What should I tell you?
Tell us what needs doing and where, plus photos if you have them. If we need more, we’ll ask.
Where is Mr Mastic based?
Our base is in Crawley, and we work across South East England, London and Scotland.
Can I add another job to the visit?
Yes. Just list everything you need and you’ll get one quote.
Do you need new build mastic in Herne Hill?
The first winter with the heating on dries a new home quickly. Gaps open along skirting, frames and worktops and cracked sealant shows up.
Common reasons people contact us include:
- Frame joints opening as the plaster dries
- Gaps behind new kitchen upstands
- Smeared, uneven beads picked up at snagging
- Joints pulling apart as timber shrinks
If you’ve bought a new home near North Dulwich station, the sealant around baths, showers and frames is worth checking in the first year or two.
Before booking anyone
- Whether they seal over old material or remove it
- How much experience the applicator has
- Whether they’re fully insured
- What guarantee comes with the work
New build mastic around Herne Hill
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. Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent.
Herne Hill is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Herne Hill is about 3 miles south of London, in Greater London. We provide new build mastic to householders, landlords and businesses in Herne Hill and the surrounding area, as part of our work across Greater London. We cover 764 towns and villages across Greater London, from the larger towns to small villages.
Our applicators cover all of the SE22, SW2 and SE24 postcode area for new build mastic and the streets around it. If you need new build mastic at a property on Jelf Road, Dewey Lane and Talma Road or anywhere close by, our applicators can take on the job. You’ll find Herne Hill on the A204 and A2214, so it’s easy for us to get to. Other places close to Herne Hill include Dulwich Village (1 mile south-east), East Dulwich (1 mile north-east), Dulwich (1 mile south-east), Denmark Hill (1 mile north) and Camberwell (1 mile north). We also work in nearby towns such as London (3 miles north), City of Westminster (5 miles north-west), Marylebone (5 miles north-west), Kensington (6 miles north-west), St Pancras (5 miles north) and Shoreditch (5 miles north).
Around Herne Hill
We work in homes and buildings around The Charter School, Half Moon pub and Belair Park and the streets around them. Herne Hill has its own railway station: North Dulwich station. Well-known places in the area include Surrey Quays Shopping Centre (3.5 miles north-east) and House of Dreams Museum (0.7 miles north-east). The countryside around Herne Hill includes Battersea Park Lake and Knight's Hill.
The process
We bring everything the job needs with us, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. Most jobs take a few hours for most snagging lists, longer for a run of plots. For a job in Herne Hill, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- 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 down to clean surfaces.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- We tool every joint neatly and tell you when each area can be used.
Preparing for the visit
- Tell us about any water getting in
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about earlier repairs to the joints
How to get a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.