Greater London · England
Gipsy Hill External Mastic
Our applicators work in Gipsy Hill on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Sealant that has lost its bond to the brick or render
- Old sealant gone brittle and cracked
- Cracked joints where brick meets render or frames
Your questions about external mastic in Gipsy Hill
Is Gipsy Hill in your area for external mastic?
Yes. Our work covers London and the South East, and Gipsy Hill is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Can you help a landlord with a rental near Gipsy Hill station?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
How long before the joint can be used?
Cure times vary by product and the conditions. Before we leave, we’ll tell you the cure time.
Do you use backing rod?
Backing rod goes into deeper joints as a matter of course. It sets the sealant depth and prevents three-sided bonding.
Are you insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Can you quote for more than one area?
Yes. Just list everything you need and we will quote it together.
Can you match the colour of my brickwork?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render so it does not stand out.
How long does external mastic last?
It depends on the exposure, the movement and the product. Sealant is a maintenance item, so check the joints once a year.
About our external mastic in Gipsy Hill
For buildings in Gipsy Hill, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean joint faces and the right depth. Common call-outs are for cracked joints where brick meets render or frames and damp patches traced to an open external joint, on brickwork movement joints, render & cladding joints and copings & trims.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. In Gipsy Hill, joints up high may need ladders or other access, which is worth talking through when you book.
Every job comes with our 12-month guarantee, wherever you are in Greater London.
- Place
- Gipsy Hill (SE19, SE27, SE21)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Quotes for external mastic in Gipsy Hill
There’s no set price list. What we look at:
- How many areas need sealing
- Any mould that needs treating
- Any working-time requirements on site
- The number and length of the joints
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
When you call or email, it’s useful to know:
- A few photos by email, if you can
- How many joints, rooms or windows are involved
- What’s wrong with the joints now
- Whether it has been sealed before
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. Whenever you are ready, ring 0345 464 0079 or send us an email.
Signs you need external mastic in Gipsy Hill
If plants are growing out of a joint, the sealant has normally failed or was never there. Roots and dirt hold water against the wall.
Common reasons people contact us include:
- Rain getting behind render or cladding at a joint
- Brick movement joints where the sealant has split
- Gaps where render, brick and frames meet
- Movement joints filled with mortar instead of sealant
As a London address, Gipsy Hill can be tricky for parking: let us know about parking bays, permits or a driveway.
Comparing quotes
- How the colour is chosen
- What the cure time is
- What the quote includes, VAT included or not
- What guarantee comes with the work
What happens if it’s left?
Running new sealant over the old bead rarely lasts. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Gipsy Hill, the repair is bigger than a sealant job.
The cost depends on the amount of work, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins, so you know where you stand.
What you get with us
- Sanitary silicone with an anti-fungal additive in wet areas
- Sealant colour chosen to suit
- Trusted Arbo and Everbuild sealants
- Domestic, commercial and hotel work
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep high-pressure jets off the joints
- Fix overflowing gutters above sealed joints
- Tell anyone working on the walls about the movement joints
- Have failed joints looked at early
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Once a joint cannot move, the wall finds another way, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
When something else is needed
Before you book, it’s worth knowing the limits:
- Movement that is more than a sealant joint can take
- Cracking across the wall rather than at a joint
- Adding movement joints to masonry that has none
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
What we seal
- Façade panels
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
What we do, step by step
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the work takes a few hours for a handful of joints, longer for a whole elevation for a typical job. For a job in Gipsy Hill, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Let us know about stairs, lifts or work at height
- Mention if the joints have been sealed before
- Mention any sign-in or site rules at work premises
How to get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved and send you a clear quote.
Read more
Walls and rooflines in Gipsy Hill
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Gipsy Hill station? Then split movement joints are easy to miss on a rental until damp shows inside. For site and facilities teams at buildings such as Paxton Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Gipsy Hill is about 3 miles south-east of Stockwell, in Greater London. Whether you are in the middle of Gipsy Hill or further out, we cover external mastic for every kind of property. 764 places in Greater London are on our list.
We work across SE19, SE27 and SE21 for external mastic and the streets around it. If you need external mastic at a property on Dover Road, Gipsy Road and Berry Lane or a nearby road, our applicators can take on the job. We also cover Upper Norwood (1 mile south-west), Norwood New Town (1 mile south-west), West Norwood (1 mile north-west), Crystal Palace (1 mile east) and West Dulwich (1 mile north). Further out, we also cover London (5 miles north), City of Westminster (7 miles north-west), Marylebone (7 miles north), Kensington (7 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Landmarks near Gipsy Hill
We work in homes and buildings around Gipsy Hill Tavern, Hillcrest and Virgo Fidelis Convent Senior School, among other places. There’s a railway station in Gipsy Hill itself: Gipsy Hill station. Nearby you’ll also find Whitgift Centre (3.3 miles south) and St Christopher's Hospice (1.2 miles east). Not far away are Knight's Hill and Dulwich Upper Wood.
Places near Gipsy Hill
Other services in Gipsy Hill
Can I do it myself?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
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.