Greater London · England
Balham Gutter Sealing
Gutter sealing in Balham from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Garage door frames letting rain in
- Drips from gutter joints and end caps
- Old gutter sealant that has let go
What we are called out for in Balham
Leaves and moss hold water in the gutter. Standing water finds the weakest joint and drips through.
These are the problems we’re asked about most:
- Streaks down the brickwork from a leaking joint
- Gaps along fascia and soffit joints
- Drips from gutter joints and end caps
- Damp patches inside below a leaking gutter
If you live in an older home near Church of St Mary, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Questions to ask before you book
- Which sealant they’ll use, and why
- Whether all the old sealant comes out first
- What insurance they hold
- What preparation is included
Gutter sealing for homes and businesses in Balham
Failed sealant round a garage door frame lets rain blow in. The frame joint is cut out and resealed with an exterior sealant. Typical jobs include gaps along fascia and soffit joints and internal damp traced to a gutter joint, on uPVC fascias, soffit joints and roofline trims.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
Every job comes with our 12-month guarantee.
- Where
- Balham (SW12, SW17, SW4)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Your questions about gutter sealing in Balham
Is Balham in your area for gutter sealing?
Yes, Balham is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we will give you a clear quote.
Can parking be tricky for a visit in Balham?
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.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Will sealing fix a sagging gutter?
Sealant won’t hold a sagging gutter. The gutter needs refixing by a gutter installer, and we will tell you if that’s what we find.
Is the work guaranteed?
There’s a 12-month guarantee on every job, gutter and fascia work included.
Can you fit new guttering?
We do not replace gutters or fascias. We will tell you if the gutter needs replacing.
Where is Mr Mastic based?
We’re a Crawley-based firm. We work across South East England, London and Scotland.
What affects the quote in Balham
There’s no set price list, because jobs vary so much. The quote depends on:
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
- Whether the work is at height
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What to tell us for a quote
To make quoting easier, please include:
- Any previous sealing or DIY work
- The rough size of the job
- Photos by email, if that is easy
- What the problem is, such as mould, gaps, leaks or cracking
Every job is quoted individually, so the first step is telling us about yours. Just phone 0345 464 0079 or email us with the details, and pictures are welcome.
What we do, step by step
The work is kept neat and contained to the joints we’re treating, so you can carry on as normal. The job usually takes a few hours, depending on the number of joints and the access, and we explain the cure time before we leave. In Balham, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- First we trace the drip and check the gutter is not damaged.
- The old sealant and dirt are cleaned out of the joint.
- We dry the joint so the new sealant can bond.
- We seal the joint with a sealant made for gutters.
- We check the run and clear debris near the joints.
Preparing for the visit
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or send us an email.
Related advice
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
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.
Balham buildings and the weather
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. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
Managing a site like Ravenstone Primary School? Then its movement joints, gutters and trims need looking after like any other building’s. Balham is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Balham is about 2 miles south-west of Stockwell, in Greater London. From the centre of Balham to the outskirts, we cover gutter sealing for every kind of property. We cover 764 towns and villages across Greater London, from the larger towns to small villages.
Postcode districts we cover here for gutter sealing: SW12, SW17 and SW4. We cover properties on Lynn Road, Weir Road and Byrne Road and the roads around them. We also cover the places around Balham: 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). Larger places within reach include 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).
What’s near Balham
Typical jobs here are in homes near Oak Lodge School, Wandsworth Common and The Bedford pub. There’s a railway station in Balham itself: Balham station. Other landmarks nearby include St James' Hospital (0.5 miles west) and London Sewing Machine Museum (0.6 miles south-west). Open spaces near Balham include Knight's Hill and Battersea Park Lake.
What we cannot put right
We will not take on work that will not last, so here’s what sealant cannot put right:
- Guttering that needs replacing
- Gutters that have dropped or pulled away
- Leaks from the roof rather than a joint
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Roofline trims
- Gutter joints
- Gutter end caps
- Garage door frames
- uPVC fascias
- Soffit joints
Towns and villages near Balham
What else we do in Balham
How the job changes by surface
Gutter end caps
Drips from a stop end run down the brickwork. It’s a quick reseal.
Gutter joints
Joints between gutter lengths are the most common leak point. We clean, dry and reseal them.