Greater London · England
Streatham Hill New Build Mastic
Problem with your new-build sealant joints in Streatham Hill? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- New-build shower sealant that has already split
- Sealant that never bonded to the surface
- Cracks appearing as a new home settles
New build mastic in Streatham Hill, done properly
A new build should have a neat, sound bead at every joint. When the finish is smeared, patchy or already cracking, it’s worth putting right early, before water gets into the floor or walls. We work on windows & doors, kitchens and plot handovers, and common reasons people get in touch are cracks appearing as a new home settles and gaps behind new kitchen upstands.
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.
You get a 12-month guarantee, the same in Streatham Hill as everywhere else we work.
- Place
- Streatham Hill (SW2, SW16, SW12)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common problems we fix in Streatham Hill
Not every new-build joint gets the right sealant: caulk where water collects, or a rigid product on a moving joint. Both fail early.
If you can see any of these, it’s time to have the joints looked at:
- Internal frame sealant that has split
- Kitchen sealant that has pulled off the wall
- Second-fix sealing on new plots
- Shower seals failing in the first year or two
For new homes near Streatham Hill station, it’s worth checking the sealant early, while snags are still fresh.
Comparing quotes
- How much experience the applicator has
- How hidden problems are handled
- Whether the sealant suits the joint
- How long to leave it before use
Also near Streatham Hill
Also in Streatham Hill
Why act early in Streatham Hill
DIY kits don’t solve the main problems with new-build sealant: grit, unprimed surfaces and old layers underneath. Proper removal and preparation are what make it last. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in Streatham Hill.
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Why book with us
- Colour picked to suit the job
- Trusted Arbo and Everbuild sealants
- Tidy, careful work
- Every job guaranteed for a year
Read what affects the cost or our reviews.
The process
The work is kept neat and contained to the area we’re working on. Expect the work to take a few hours for most snagging lists, longer for a run of plots, and we tell you how long to leave it before we go. For a job in Streatham Hill, 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.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- The failed sealant is removed completely.
- Joints are vacuumed and cleaned of building dust.
- Primer goes on where the surface and product need it, then the new sealant.
- We tool every joint neatly and tell you when each area can be used.
Getting ready for the visit
- Mention any tricky access
- Where the joints are inside, avoid wetting them before we arrive
- On commercial sites, let us know about site rules
Ask for a quote
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To get started, phone 0345 464 0079 or drop us an email.
Advice
Common questions in Streatham Hill
Can parking be tricky for a visit in Streatham Hill?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Do you cover Streatham Hill for new build mastic?
Yes. We work across London and the South East, and Streatham Hill is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll send you a clear quote.
Why has my new-build shower seal failed already?
There are generally two causes: the house moving as it dries, and sealant that never bonded properly. Cutting it out and resealing properly fixes both.
Is it messy?
We keep the work tidy. Nearby surfaces are protected, and the area is left clean when we finish.
How do I get a quote for new build mastic in Streatham Hill?
Size, access and the old material all affect the cost. Call for a quick quote.
I’m a tenant. Can you help?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Are you insured?
Yes, we are fully insured.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
What affects the cost of new build mastic
For a quick quote, just ask. What matters most is:
- How easy the joints are to reach
- Which sealant suits the joint
- Mould in or behind the old joints
- Working hours on commercial sites
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Asking for a quote
To help us quote quickly, let us know:
- If someone has resealed it before
- What the problem is, such as mould, gaps, leaks or cracking
- How we’d reach the joints
- The type of property
For a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
For landlords and businesses
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Keep photos and emails about snagging items
- Resist patching a failed seal with a tube from the DIY shop
- Act quickly if a seal starts to leak
- Look at the sealant regularly in the first couple of years
Keep an eye on the joints over the first couple of years. Small gaps can appear as the house dries and can be resealed later.
Do not let the snagging period run out with sealant problems unreported. Once it ends, the repair may be down to you.
What new build mastic looks like in Streatham Hill
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent.
Streatham Hill is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Streatham Hill is about 2 miles south of Stockwell, in Greater London. For new build mastic in and around Streatham Hill, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We’re based in Crawley and cover Greater London. Across Greater London, we cover 764 places, and Streatham Hill is one of them.
Postcode districts we cover here for new build mastic: SW2, SW16 and SW12. Whether your property is on Keymer Road, Romeyn Road and Palace Road or a nearby road, our applicators can take on the job. Main roads around Streatham Hill include the A205, so getting to you is simple. Other places close to Streatham Hill include Tulse Hill (1 mile north-east), Hyde farm estate (1 mile west), Streatham (1 mile south), Grange Mills (1 mile west) and Clapham Park (1 mile north-west). Within a short drive, we also cover London (4 miles north), City of Westminster (5 miles north), Marylebone (5 miles north), Kensington (5 miles north-west), St Pancras (6 miles north) and Shoreditch (6 miles north).
Near you in Streatham Hill
Locally, jobs take us to homes and businesses close to City Heights E-ACT Academy, Streatham Common and The Holland Tringham pub. There’s a railway station in Streatham Hill itself: Streatham Hill station. Well-known places in the area include Tooting Bec Hospital (1.4 miles south-west) and Southside Wandsworth (3.2 miles west). Not far away are Battersea Park Lake and Knight's Hill.
DIY sealant or a professional job?
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.
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 fails, we can still redo it.