Greater London · England
New-build mastic & snagging in Forest Hill, Greater London
Specialist new build mastic for Forest Hill: careful preparation, the right product and tidy work. Call for a quick quote.
- Gaps opening as the house dries out and settles
- Messy sealant that spoils new finishes
- Beads laid onto grit and dust from the build
What we cannot put right
In fairness, some problems need a different trade:
- Disputes or warranty claims with your builder
- Movement caused by a poorly fitted tray or bath
- Plumbing faults behind the sealant
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think.
Where we work in Forest Hill
- Windows & doors
- Kitchens
- Plot handovers
- Bathrooms & en suites
- Skirting & floors
- Show homes
New build mastic for homes and businesses in Forest Hill
New homes move as they dry out. Timber shrinks, plaster dries and baths and trays bed down, so sealant that was laid quickly before handover often cracks. If you have cracked caulk along new skirting and smeared, uneven beads picked up at snagging, we can put it right.
London homes range from new-build flats to period conversions with new floors laid over old boards. Wherever a floor meets a wall, a skirting or a threshold, the joint has to allow for movement, in Forest Hill as anywhere.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Forest Hill (SE23, SE22, SE26)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Common problems we fix in Forest Hill
Not every new-build joint gets the right sealant: decorators’ caulk in a wet area, or a stiff sealant where there’s movement. Neither lasts long.
The problems people normally mention when they call include:
- Plot mastic for developers ahead of handover
- Beads laid onto grit and dust from the build
- Joints pulling apart as timber shrinks
- Gaps behind new kitchen upstands
If you’ve bought a new home near Honor Oak Park station, the sealant around baths, showers and frames is worth checking in the first year or two.
What your quote should include
- How much experience the applicator has
- Which sealant they’ll use, and why
- The length of the guarantee
- Whether they’re fully insured
What we do, step by step
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for most snagging lists, longer for a run of plots, and the area is left clean. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- The failed sealant is removed completely down to clean surfaces.
- Joints are vacuumed and cleaned of building dust.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
How to prepare
- For business premises, tell us about site rules or sign-in
- For indoor joints, keep the area dry beforehand if you can
- Move anything stored near the joints
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Read more
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Record problems with dated pictures
- Look at the sealant regularly in the first couple of years
- 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’s useful if you need to raise other issues later.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Early resealing keeps the job small and protects the rest of the house.
What new build mastic looks like in Forest Hill
The South East is one of 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 snags may need reporting through the developer or the managing agent.
Forest Hill is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Forest Hill is about 2 miles south-east of East Dulwich, in Greater London. Whether you’re in the middle of Forest Hill or further out, new build mastic is available for homes and businesses alike. Across Greater London, we cover 764 places, and Forest Hill is one of them.
Our applicators cover all of SE23, SE22 and SE26 for new build mastic. Whether your property is on Ewart Road, London Road and Rojack Road or a nearby road, our applicators can take on the job. Neighbouring places we cover for new build mastic include Honor Oak (1 mile north), Perry Vale (1 mile south-east), Brockley (1 mile north-east), Crofton Park (1 mile north-east) and Dulwich (1 mile west). Further out, we also cover London (4 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles north-west), St Pancras (6 miles north-west) and Shoreditch (6 miles north).
What’s near Forest Hill
Around Forest Hill, our work takes us to homes and buildings near Allenby Tutorial Trust, Capitol Cinema pub and Harris Girls' Academy East Dulwich. Forest Hill’s nearest station is Honor Oak Park station, about 0.5 miles north-east. Other landmarks nearby include Greenwich Castle (3.1 miles north-east) and Horniman Museum and Gardens (0.5 miles south-west). Not far away are One Tree Hill and Knight's Hill.
Towns and villages near Forest Hill
What else we do in Forest Hill
Landlord and commercial work in Forest Hill
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
We work for landlords and letting agents as well as householders. Resealing between tenancies keeps a property looking cared for.
How the job changes by surface
Skirting and floors
Where the floor meets a bath panel or kitchen plinth, the joint keeps mop water out. We seal them with a sealant suited to wet areas.
Show homes
Bathrooms, kitchens and frames in show homes are sealed or resealed to a neat finish to a tidy standard. Tell us when the home is open so we can plan around it.
Forest Hill: your questions answered
Do you work for landlords with property near Honor Oak Park station?
Yes, we work for landlords and letting agents. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Can you do new build mastic in Forest Hill?
Yes, Forest Hill is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Can you work from my snagging list?
Yes. Snagging lists are a common starting point for us. We’ll go through the sealant items and agree what we’ll do.
Do you have insurance?
Yes. Full insurance covers our work.
What should I tell you?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply phone 0345 464 0079 or email us.
Can new sealant go on top of the old bead?
No. We always remove the existing bead, the joint cleaned and primed where needed, before resealing.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator.
What colour sealant will you use?
It depends on the joint: white or clear for most sanitary joints, colours for worktops, floors and frames. We agree the colour before any work starts.
What affects the cost of new build mastic
There’s no set price list, because jobs vary so much. What we look at:
- When we can work, for business premises
- How many rooms, windows or areas are involved
- The type of sealant required
- The size of the job
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
Asking for a quote
You don’t need to know the technical terms. Just tell us:
- Any access issues, like height or stairs
- How many joints, rooms or windows are involved
- Photos by email, if that is easy
- Whether it’s a home or a business
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 will explain what’s involved before giving you a price.