Greater London · England
External & façade joints in Petts Wood, Greater London
External mastic across Petts Wood and nearby, with every bit of old sealant taken out first and a one-year guarantee.
- Damp patches traced to an open external joint
- Cracked joints where brick meets render or frames
- Moss and dirt in joints with no sealant left
Common questions in Petts Wood
Can you help a landlord with a rental near Petts Wood station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Can you do external mastic in Petts Wood?
Yes. Our work covers London and the South East, and Petts Wood is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
Is the work guaranteed?
Yes. All our work carries our one-year guarantee.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
What is a movement joint?
A vertical gap in a long brick wall is generally a movement joint. It lets the bricks expand without cracking.
How much does external mastic cost in Petts Wood?
Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges and have them redone then.
External mastic for homes and businesses in Petts Wood
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a matching colour. If you have plants rooting in failed movement joints and brick movement joints where the sealant has split, we can put it right, on copings & trims, joints between brick and frames and brickwork movement joints alike.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Petts Wood, tell us how high the joints are and how to reach the back of the building.
You get a one-year guarantee, the same in Petts Wood as everywhere else we work.
- Place
- Petts Wood (BR5, BR6, BR2)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How the visit works
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and clear up. Most jobs take anything from a few hours to several days, depending on the building. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Petts Wood. It helps if you can point us to a visitor permit or a bay close to the door.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Tell us if parking is tricky
- Mention any tricky access
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
For external mastic in Petts Wood, call 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
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Leave it or put it right?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render, so the damage spreads beyond the joint. In London conversions, one flat’s bathroom is often above another flat’s ceiling, 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 Petts Wood.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
Why choose Mr Mastic in Petts Wood
- White, clear, grey or another colour, product permitting
- Anti-fungal silicone where joints get wet
- A sealant colour to suit the surroundings
- Every job guaranteed for a year
See our cost guide and our reviews.
What external mastic looks like in Petts Wood
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
Schools such as Crofton Junior School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. For landlords with property near Petts Wood station, split movement joints are easy to miss on a rental until damp shows inside.
Petts Wood is about 1 mile west of Orpington, in Greater London. Whether you are in the middle of Petts Wood or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. 764 places in Greater London are on our list. For nearby work, see our London page.
Work in BR5, BR6 and BR2 is quoted and booked the same way as anywhere else. We cover properties on Tent Peg Lane, Ryecroft Road and Beaumont Road. We also cover the places around Petts Wood: Crofton (1 mile south), Broom Hill (1 mile south-east), Southborough (1 mile west), Locksbottom (1 mile south-west) and Bromley Common (2 miles west). Larger places within reach include London (11 miles north-west), City of Westminster (13 miles north-west), Marylebone (13 miles north-west), Kensington (14 miles north-west), St Pancras (13 miles north-west) and Shoreditch (12 miles north-west).
Near you in Petts Wood
Locally, jobs take us to homes and businesses close to Jubilee Country Park, Bromley High School and Daylight Inn. Petts Wood has its own railway station: Petts Wood station. Other landmarks nearby include Bridgeways Day Hospital (1.5 miles west) and Crofton Roman Villa (1.2 miles south-east). The countryside around Petts Wood includes The Warren and Summer Hill.
Landlord and commercial work in Petts Wood
Landlords and letting agents in Petts Wood can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Towns and villages near Petts Wood
More services for Petts Wood
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Look over the joints every year, ideally after winter
- Leave the joints unpainted unless we’ve said otherwise
- Avoid pressure-washing directly into sealant joints
- Tell anyone working on the walls about the movement joints
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Should I try it myself first?
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.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
What affects the quote in Petts Wood
The price is agreed before any work begins. It’s based on:
- How much old sealant there is and how hard it is to remove
- The type of sealant required
- Whether the work is at height
- The number of rooms or windows
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Call for a quick quote and we will explain what it covers.
What to tell us for a quote
What to tell us when you ask for a quote:
- Roughly how big the job is
- If it’s domestic, commercial or a hotel
- A few photos by email, if you can
- Any previous sealing or DIY work
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll take it from there.
Signs you need external mastic in Petts Wood
Weeds, moss and debris in a joint are a sign the sealant has gone. Dirt and roots then trap moisture in the joint.
Any of these means the joints need attention:
- Rain getting behind render or cladding at a joint
- Movement joints with cracked, split or missing sealant
- Hard, crazed mastic that has stopped moving
- Gaps where render, brick and frames meet
As a London address, Petts Wood can be tricky for parking: let us know about parking bays, permits or a driveway.
Comparing quotes
- How much experience the applicator has
- How the joint is cleaned and prepared
- What happens if they find a problem under the old sealant
- What insurance they hold