Greater London · England
External Mastic in Perry Vale
External mastic across Perry Vale and nearby, with old sealant always removed completely.
- Weeds or debris growing in open joints
- Sealant pulling away from one side of the joint
- Damp patches traced to an open external joint
Different surfaces, different methods
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joint sealant has to cope with frequent movement. We choose the product to suit.
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
External mastic for homes and businesses in Perry Vale
For buildings in Perry Vale, 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. Typical jobs include cracked joints where brick meets render or frames and weathered mastic that no longer stretches, on copings & trims, façade panels and brickwork movement joints.
Outside work in London starts with access: side passages, upper floors and where to park. In Perry Vale, joints up high may need ladders or other access, which is worth talking through when you book.
Whatever the size of the job, you get the same one-year guarantee.
- Place
- Perry Vale (SE23, SE26, SE6)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near Perry Vale
More services for Perry Vale
Walls and rooflines in Perry Vale
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. Historic houses like Kingswood House (about 1.7 miles west) are a reminder that the area around Perry Vale has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
Schools such as Perrymount Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Perry Vale is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Perry Vale is about 3 miles south of New Cross, in Greater London. Whether you’re in the middle of Perry Vale or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, and Perry Vale is one of them.
Work in SE23, SE26 and SE6 is quoted and booked the same way as anywhere else. You’ll find streets such as Como Road, Mayow Road and South Road. If you are just outside Perry Vale, we cover Bell Green (1 mile south-east), Sydenham (1 mile south-west), Bellingham (1 mile east), Southend (1 mile east) and Forest Hill (1 mile north-west). We also work in nearby towns such as London (5 miles north-west), City of Westminster (7 miles north-west), Marylebone (7 miles north-west), Kensington (8 miles north-west), St Pancras (7 miles north-west) and Shoreditch (6 miles north).
Near you in Perry Vale
Typical jobs here are in homes near Mayow Park, Capitol Cinema pub and Forest Hill School and the streets around them. For rail, the closest station is Forest Hill station, about 0.5 miles north-west of the centre. Well-known places in the area include Lewisham Shopping Centre (2.3 miles north-east) and Greenwich Castle (3.5 miles north-east). For a walk, there’s Dacres Wood and Knight's Hill.
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Act on the first splits you see
- Deal with leaking gutters that soak the joints below
- Ask before painting over external sealant
- Point out the joints to other trades
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
Quotes for external mastic in Perry Vale
Every job gets its own quote. These are the things that affect it:
- The product the joint needs
- Access and height
- How many areas need sealing
- Any working-time requirements on site
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Ask us for a quote and we will go through it with you.
Asking for a quote
You do not need to know the technical terms. It helps if you can tell us:
- Where the job is, and your postcode
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it’s a home or a business
- If someone has resealed it before
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
Perry Vale questions
Is parking an issue for external mastic in Perry Vale?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
I let a flat near Forest Hill station. Can you help?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
How long does the job take?
Most jobs take anything from a few hours to several days, depending on the building. Your quote will say how long we expect yours to take.
Where do you work from?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Can you seal joints between render and window frames?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces with primer where required.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose, and the wall may crack nearby. We will reseal it with a flexible sealant.
When to call us in Perry Vale
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
Most people get in touch when they notice something like this:
- Gaps where render, brick and frames meet
- Weathered mastic that no longer stretches
- Sealant that has lost its bond to the brick or render
- Panel joints letting water in
For an older house near a landmark such as Christ Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Questions to ask before you book
- What insurance they hold
- How the colour is chosen
- How long the guarantee is
- Whether VAT is included
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Landlords, agents and businesses in Perry Vale
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
The process
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours to a few days, depending on the length of joint and the access. For a job in Perry Vale, 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.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
- Mention if the joints have been sealed before
How to get a quote
There’s no standard price list. Instead, we give you a clear price for your job. To arrange one, ring 0345 464 0079 or email us.