Greater London · England
Gutter Sealing in Streatham
Sealing leaking gutter joints, end caps, fascias, soffits and roofline trims for Streatham, backed by a one-year guarantee. Call for a quick quote.
- Wet patches on the wall under a gutter joint
- Earlier gutter repairs that have peeled off
- Damp patches inside below a leaking gutter
Gutter sealing in Streatham, done properly
Gaps along uPVC fascias and soffits look untidy and can let in water and draughts. We seal them in a colour to suit where possible. If you have cracked sealant along roofline trims and end caps that drip every time it rains, we can put it right.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in Streatham, check the lease for who looks after the outside.
Every job comes with a one-year guarantee.
- Where
- Streatham (SW16, SW2, CR4, SW12)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Roofline trims
We seal the trims, not the roof. A roofer deals with the roof itself.
Gutter end caps
We seal end caps from the inside where we can reach, after cleaning and drying.
Quotes for gutter sealing in Streatham
Every job gets its own quote. These are the things that affect it:
- The size of the job
- Any mould that needs treating
- Any working-time requirements on site
- Access and height
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What to tell us for a quote
What to tell us when you ask for a quote:
- If someone has resealed it before
- The problem you’ve noticed
- Where the job is, and your postcode
- Access, such as stairs, a lift or height
If you’re in Streatham and need gutter sealing, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before work begins.
Nearby places to Streatham
What else we do in Streatham
What we can’t put right
Before you book, it’s worth knowing the limits:
- Guttering that needs replacing
- Roof leaks, slipped tiles or failed flashing (a roofer’s job)
- Sagging gutters or broken brackets
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
What we seal
- Gutter joints
- uPVC fascias
- Roofline trims
- Gutter end caps
- Garage door frames
- Soffit joints
Outside joints around Streatham
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. With historic houses such as Kingswood House (about 2 miles east) nearby, there’s older building stock in the area around Streatham as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Streatham is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Managing a site like St Andrew's Catholic Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
Streatham is about 5 miles south of London, in Greater London. We carry out gutter sealing for homes and businesses in Streatham, as part of our work across Greater London. We cover 764 towns and villages across Greater London, from the larger towns to small villages.
All of SW16, SW2, CR4 and SW12 is within our area for gutter sealing. Gutter sealing is available to properties on Stanthorpe Road, Gleneagle Mews and Madeira Road and the roads around them. You’ll find Streatham on the A205 and A216, so it’s easy for us to get to. If you are just outside Streatham, we cover Streatham Park (1 mile west), Furzedown (1 mile west), Streatham Hill (1 mile north), Hyde farm estate (1 mile north) and Grange Mills (1 mile north-west). Larger places within reach include London (5 miles north), City of Westminster (6 miles north), Marylebone (6 miles north), Kensington (6 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Local landmarks in Streatham
Locally, jobs take us to homes and businesses close to Bishop Thomas Grant Catholic Secondary School, Streatham Common and Waldorf School of South West London, among other places. There’s a railway station in Streatham itself: Streatham station. Nearby you will also find Clockworks Museum (1.1 miles east) and Southside Wandsworth (3.3 miles north-west). Open spaces near Streatham include Knight's Hill and Battersea Park Lake.
Streatham questions
Can parking be tricky for a visit in Streatham?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Do you work for landlords with property near Streatham station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Is sealing fascia joints something you do?
We do. We seal the joints, not replace the boards and we’ll let you know if a board has failed.
Where is Mr Mastic based?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
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.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We will tell you how long to leave the joint.
How long will you be here?
Typically it takes a few hours, depending on the number of joints and the access. Bigger jobs take longer.
What we do, step by step
On the day, we look over the joints with you first, so you know exactly what we are doing. We protect the surfaces around the joints before any work begins. Most jobs take a few hours, depending on the number of joints and the access. In a London area like Streatham, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We find where the water is coming from and check the gutter is sound.
- 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.
- The gutter is checked and debris around the joints cleared.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Keep pets and children clear of the area while we work
- Tell us about any previous sealing or DIY attempts
Get a quote
We quote each job on its own. Simply ring 0345 464 0079 or send us an email and describe the job.
Related advice
Aftercare tips
To keep the joints looking good and working properly:
- Look at the gutters while it’s raining
- Deal with a drip before winter
- Clean out the gutters once or twice a year
- Check that water runs out of the downpipes
Make sure downpipes aren’t blocked, so water can get away. A blocked pipe backs water up to the joints.
The sooner a gutter leak is sealed, the less water reaches the wall. We will let you know if the gutter needs more than sealant.
Signs you need gutter sealing in Streatham
Stop ends take pressure from water running along the gutter. Once the seal behind them fails, they drip.
These are the problems we are asked about most:
- Drips from gutter joints and end caps
- Failed sealant on a garage door frame
- Earlier gutter repairs that have peeled off
- Damp patches inside below a leaking gutter
If you let a flat or house near Streatham station, leaking gutter joints on a rental are best caught before they stain the walls.
Comparing quotes
- Whether all the old sealant comes out first
- Is VAT in the price?
- How long to leave it before use
- How long the guarantee is
What happens if it’s left?
Sealing over a dirty, wet joint is a quick fix that rarely lasts but it tends to peel off. Proper preparation is the difference. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in Streatham.
Doing several joints on one visit is usually more efficient than separate visits. We will give you a clear quote for the lot.
What you get with us
- We agree the colour with you first
- Tidy, careful work
- Old sealant always removed completely
- More than 20 years in sealant work
Take a look at how sealant jobs are priced and our reviews.