Greater London · England
South Hampstead New Build Mastic
New build mastic for South Hampstead and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Second-fix sealing on new plots
- Shower seals failing in the first year or two
- Sealant that never bonded to the surface
What affects the quote in South Hampstead
The price is agreed before any work begins. It’s based on:
- Whether the work is at height
- How much there is to do
- The number of rooms or windows
- Whether there’s mould to deal with
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Call for a quick quote and we will explain what it covers.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- The address or postcode of the job
- How many joints, rooms or windows are involved
- How we’d reach the joints
- Photos by email, if that’s easy
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we will explain what’s involved and give you a clear price.
New build mastic in South Hampstead, done properly
Snagging sealant properly means taking the failed bead out completely. Fresh silicone can’t bond to the old layer, so the joint is cut out, cleaned, dried and resealed. We’re often asked to deal with internal frame sealant that has split and joints pulling apart as timber shrinks, on show homes, windows & doors and kitchens.
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, in South Hampstead as anywhere.
Each job carries a 12-month guarantee.
- Location
- South Hampstead (NW3, NW8, NW6)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
When it isn’t the sealant
We will not take on work that will not last, so these are the limits:
- Structural cracks in walls or ceilings
- Broken tiles or a split tray
- Leaks from pipes, valves or wastes, which need a plumber
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think.
Joints and surfaces we work on
- Show homes
- Windows & doors
- Bathrooms & en suites
- Plot handovers
- Skirting & floors
- Kitchens
Why it’s worth doing now in South Hampstead
For developers, getting the sealant right first time saves return visits. Every return visit for a failed seal takes time. 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 South Hampstead, the repair is bigger than the sealant job would have been.
Leaving a failed joint normally makes the job bigger, not smaller. If you’re unsure, call 0345 464 0079 or email us for an honest opinion and a quote.
Why us?
- Fully insured
- Homes, businesses and hotels
- A sealant colour to suit the surroundings
- Rated 4.9 stars on Google
See what affects the cost or our reviews.
Can I do it myself?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
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.
When to call us in South Hampstead
Sealant is often one of the last jobs before handover. Joints aren’t always cleaned of dust or primed, and the sealant sits on grit instead of the surface.
Any of these means the joints need attention:
- Skirting joints opening in the first winter
- Cracks appearing as a new home settles
- Cracked sealant around new window and door frames
- Messy sealant that spoils new finishes
If you’ve bought a new home near South Hampstead station, the sealant around baths, showers and frames is worth checking in the first year or two.
What your quote should include
- When the joint can take water or movement
- How the colour is chosen
- Who turns up on the day
- How long the guarantee is
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes a few hours for most snagging lists, longer for a run of plots. For a job in South Hampstead, 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.
- Each joint is checked for movement before we start.
- 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
- Where the joints are inside, avoid wetting them before we arrive
- On commercial sites, let us know about site rules
- Keep children and pets away from the work area
Ask for a quote
Every job is quoted individually. Simply call 0345 464 0079 or send us an email and describe the job.
Advice
What new build mastic looks like in South Hampstead
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Much of London’s new housing is flats in larger developments, where snags may need reporting through the developer or the managing agent.
South Hampstead is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
South Hampstead is about 1 mile south of Hampstead, in Greater London. From the centre of South Hampstead to the outskirts, new build mastic is available for homes and businesses alike. We cover 764 towns and villages across Greater London, from the larger towns to small villages.
Here we cover the NW3, NW8 and NW6 postcode area for new build mastic. We cover properties on Avenue Road, Acacia Road and Harben Road and the roads around them. If you are just outside South Hampstead, we cover Swiss Cottage (1 mile north), St John's Wood (1 mile south), Haverstock (1 mile east), Belsize Park (1 mile east) and Primrose Hill (1 mile east). Further out, we also cover London (4 miles south-east), Kensington (3 miles south-west), St Pancras (3 miles south-east), Shoreditch (4 miles east), Walthamstow (7 miles north-east) and Hoxton (4 miles east).
Landmarks near South Hampstead
In South Hampstead, that means homes and buildings near Cafe Med pub, St. Mary's Town and Country School and Holy Trinity CofE Primary School and the streets around them. Also close by are Cecil Sharp House (1.1 miles east) and Primrose Hill (0.6 miles east). There’s a railway station in South Hampstead itself: South Hampstead station. Well-known places in the area include Isokon Gallery (0.8 miles north-east) and O2 Centre (0.5 miles north-west). Not far away are Adelaide Nature Reserve and The Long Water.
Places near South Hampstead
Also in South Hampstead
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Follow the cure time we give you
- Open a window or run the fan after bathing
- Resist patching a failed seal with a tube from the DIY shop
- Act quickly if a seal starts to leak
Photograph failed sealant before it’s redone and keep the builder’s replies. It helps if anything else comes up during the warranty period.
Report failed sealant to the builder while you are in the snagging period. Once it ends, the repair may be down to you.
FAQs for South Hampstead
Can you help a landlord with a rental near South Hampstead station?
Yes. We work for landlords and agents as well as householders. Just call 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Is parking a problem for a job in South Hampstead?
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.
What sealant do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Why does sealant fail so quickly in new builds?
Lots of new homes see sealant crack early as timber and plaster dry out. Rushed application on dusty surfaces makes it worse.
Do you work through snagging lists?
Yes. Send us the sealant items on the list, with pictures if you can, and we will quote. We will flag anything that needs another trade.
Do you work for developers?
Yes. We seal plots to the developer’s programme. Tell us the plots and the joints involved and we will quote.
Can you do several jobs on one visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Do you cover South Hampstead?
Yes, we do. Our applicators work in South Hampstead.