Greater London · England
External & façade joints in Grove Park, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Grove Park. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Leaking joints around cladding and façade panels
- Joints where the bead has come unstuck
- Joints pointed up with cement by mistake
External mastic in Grove Park: local notes
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. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
In the older streets around St Augustine's Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Letting a property close to Grove Park station? Then split movement joints are easy to miss on a rental until damp shows inside. If you look after a building such as Haberdashers' Aske's Knights Academy, its movement joints, gutters and trims need looking after like any other building’s.
Grove Park is about 2 miles south-west of Eltham, in Greater London. Whether you’re in the middle of Grove Park or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Grove Park is one of 764 towns and villages in Greater London where we work for external mastic. For nearby work, see our London page.
Every address in BR1, SE12 and SE9 is within our area for external mastic. If you need external mastic at a property on Shaw Road, Camlan Road and Baring Road or anywhere close by, our applicators can take on the job. Grove Park sits on or near the A2212. We also cover the places around Grove Park: Chinbrook (1 mile east), Mottingham (1 mile east), Downham (1 mile south-west), Plaistow (1 mile south-west) and Sundridge (1 mile south). Further out, we also cover London (7 miles north-west), City of Westminster (9 miles north-west), Marylebone (9 miles north-west), Kensington (11 miles north-west), St Pancras (9 miles north-west) and Shoreditch (8 miles north-west).
Near you in Grove Park
We work in homes and buildings around Cooper's Lane Primary School, Chinbrook Meadows and Colfe's School and the streets around them. Grove Park has its own railway station: Grove Park station. A little further out are The Glades (1.9 miles south) and Eltham Community Hospital (1.9 miles north-east). For a walk, there’s Downham Woodland Walk and Summer Hill.
How we handle external mastic in Grove Park
For buildings in Grove Park, 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. We work on render & cladding joints, copings & trims and concrete & block, and people most often call us about joints with sealant missing in places and sealant pulling away from one side of the joint.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall, and both kinds of building are found across London.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or send us an email.
- Place
- Grove Park (BR1, SE12, SE9)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What the job involves on each surface
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
What else we do in Grove Park
What happens if it’s left?
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. 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. Dealing with it early is far simpler for homes in Grove Park.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
What you get with us
- You choose the colour before work begins
- Approved under the ARBOMaster scheme
- We are fully insured
- Rated 4.9 stars on Google
Take a look at how sealant jobs are priced or what customers say.
How it works
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take a few hours for a handful of joints, longer for a whole elevation. In Grove Park, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Mention any parking rules near the property
- Mention if the joints have been sealed before
- Move anything stored near the joints
How to get a quote
Need a quote? Please call 0345 464 0079 or email us and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
Your questions about external mastic in Grove Park
Can parking be tricky for a visit in Grove Park?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Can you help a landlord with a rental near Grove Park station?
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’ll give you a clear quote.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used before we leave.
How long does external mastic take?
Typically it takes a few hours for a handful of joints, longer for a whole elevation. Larger jobs naturally take longer.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Can a movement joint be filled with mortar?
No. Cement or mortar cannot stretch and the joint fails. Where a joint has been mortared, it can often be raked out and sealed properly.
Will the old sealant be removed?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
For landlords and businesses
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Can I do it myself?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
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.
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Deal with leaking gutters that soak the joints below
- Look over the joints every year, ideally after winter
- Show decorators and builders where the movement joints are
- Do not let climbing plants root in the sealant
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
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.
What affects the cost of external mastic
For a quick quote, just ask. What matters most is:
- The amount of work
- Mould in or behind the old joints
- When we can work, for business premises
- Access and height
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
Helping us quote
What to tell us when you ask for a quote:
- Whether it has been sealed before
- Where the property is
- What the problem is, such as mould, gaps, leaks or cracking
- Photos by email, if that’s easy
If you are in Grove Park and need external mastic, call 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.