Greater London · England
New Build Mastic in Balham
Specialist new build mastic for Balham: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Messy sealant that spoils new finishes
- Leaking shower tray seals in a new home
- Gaps behind new kitchen upstands
How we handle new build mastic in Balham
Developers send us the plot schedule and we work through it. We seal bathrooms, kitchens, windows, doors and skirting so plots are ready to hand over with a sealant suited to each area. We work on bathrooms & en suites, skirting & floors and plot handovers, and the jobs we see most are skirting joints opening in the first winter and kitchen sealant that has pulled off the wall.
Across London, commercial floors have movement joints that break down under heavy foot traffic, while new homes need a neat, sound finish around frames, baths and kitchens before handover.
There’s a 12-month guarantee on every job.
- Place
- Balham (SW12, SW17, SW4)
- Region
- Greater London
- Cover
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Don’t seal over failed sealant yourself
- Don’t wait for the house to settle if water is getting through
- Put sealant faults on your snagging list early
- Look at the sealant regularly in the first couple of years
Clean the sealant with a mild detergent and a soft cloth. Avoid abrasive pads and strong solvents.
A seal that splits early is often a sign of movement. Have it resealed, and the tray or bath checked, before it gets worse.
Nearby places to Balham
Other services in Balham
Quotes for new build mastic in Balham
There’s no set price list, because jobs vary so much. The quote depends on:
- Any working-time requirements on site
- The type of sealant required
- Any mould that needs treating
- Whether the work is at height
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
What to tell us for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Access, such as stairs, a lift or height
- The problem you’ve noticed
- The type of property
- Any previous sealing or DIY work
If you are in Balham and need new build mastic, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before we start.
Why act early in Balham
Sealant done properly at handover means fewer callbacks. Snagging visits for failed sealant cost time on every plot. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Balham, the repair is bigger than a sealant job.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why choose Mr Mastic in Balham
- White, clear, grey or another colour, product permitting
- 180+ five-star Google reviews
- Full insurance on every job
- 20+ years of sealant experience
Take a look at what affects the cost and what customers say.
Landlords, agents and businesses in Balham
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
How the visit works
When we arrive, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before we start. Most jobs take anything from a few hours to several days, depending on the number of plots. 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.
- We clean out the dust and grit left from the build.
- 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.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- On commercial sites, let us know about site rules
- Let us know if you’ve seen damp or leaks
Get a quote
Want a quote for new build mastic? Please phone 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Advice
What new build mastic looks like in Balham
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.
If you’ve bought a new home near Balham station, the sealant around baths, showers and frames is worth checking in the first year or two. Balham is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Balham is about 2 miles south-west of Stockwell, in Greater London. Every kind of property in Balham can book us for new build mastic. The work is guaranteed for a year. Balham is one of 764 places in Greater London where we work.
Work in SW12, SW17 and SW4 works the same way as everywhere else we cover. New build mastic is available to properties on Lynn Road, Weir Road and Byrne Road and the roads around them. Nearby, we also carry out new build mastic in Grange Mills (1 mile north-east), Hyde farm estate (1 mile east), Clapham Park (1 mile north-east), Streatham Park (1 mile south-east) and Tooting Bec (1 mile south-west). Within a short drive, we also cover London (5 miles north-east), City of Westminster (5 miles north), Marylebone (5 miles north), Kensington (4 miles north-west), St Pancras (6 miles north) and Shoreditch (7 miles north-east).
Near you in Balham
In Balham, that means homes and buildings near Oak Lodge School, Wandsworth Common and The Bedford pub and the streets around them. There’s a railway station in Balham itself: Balham station. Nearby you will also find St James' Hospital (0.5 miles west) and London Sewing Machine Museum (0.6 miles south-west). The countryside around Balham includes Knight's Hill and Battersea Park Lake.
Your questions about new build mastic in Balham
I let a flat near Balham station. Can you help?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Is Balham in your area for new build mastic?
Yes. Our work covers London and the South East, and Balham is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear quote.
Will you just run a new bead over the existing one?
No. We always remove the existing bead, then clean and prime the joint, before resealing.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.
Are you an approved applicator?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
When is the best time to reseal in a new build?
Where water is getting through, do not wait. Small gaps that are just cosmetic can be resealed once movement has slowed.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
What the job involves on each surface
Kitchens
Sink joints are wet all the time. We use a sealant suited to kitchens suited to the job.
Bathrooms and en suites
En suite showers are a common source of leaks into the room below. Resealing properly keeps water where it belongs.
Can I do it myself?
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 doesn’t work out, we can still put it right.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.