Greater London · England
External Mastic in Biggin Hill
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Biggin Hill and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Rain getting behind render or cladding at a joint
- Brick movement joints where the sealant has split
- Old sealant gone brittle and cracked
External mastic in Biggin Hill
A movement joint is a deliberate break that lets a wall expand and contract. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. We work on brickwork movement joints, render & cladding joints and façade panels, and the jobs we see most are movement joints with cracked, split or missing sealant and panel joints letting water in.
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.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- Biggin Hill (TN16, BR6)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Landlord and commercial work in Biggin Hill
If you manage several properties in or around Biggin Hill, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
What we can’t put right
We will always be straight with you, so here’s what sealant cannot fix:
- Adding movement joints to masonry that has none
- Render that’s blown, hollow or coming away
- Cracking across the wall rather than at a joint
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before you book.
Joints and surfaces we work on
- Concrete & block
- Joints between brick and frames
- Façade panels
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
What the job involves on each surface
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. The movement joint takes that up, so its sealant has to stay flexible.
Why it’s worth doing now in Biggin Hill
A failed movement joint lets water into the wall and can run behind render or cladding. Resealing early keeps the job to the joint itself, rather than the wall around it. 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 Biggin Hill.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll explain what it covers.
Why choose Mr Mastic in Biggin Hill
- Quality sealants from Arbo and Everbuild
- We leave the area clean and tidy
- 20+ years of sealant experience
- An ARBOMaster approved applicator
Walls and rooflines in Biggin Hill
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. With historic houses such as Down House (about 1.7 miles north-east) nearby, there’s older building stock in the area around Biggin Hill as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you look after a building such as Oaklands Primary Academy, larger buildings have long runs of movement joint that eventually need resealing. Letting a property close to Woldingham station? Then split movement joints are easy to miss on a rental until damp shows inside. Biggin Hill is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Biggin Hill is about 6 miles east of Caterham, in Greater London. From the centre of Biggin Hill to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Biggin Hill is one of 764 towns and villages in Greater London we cover for external mastic. Our London page covers work nearby.
Work in TN16 and BR6 is quoted and booked the same way as anywhere else. You will find streets such as Rushdene Walk, Mount Pleasant and Stock Hill, and we cover them all. With the A233 close by, Biggin Hill is easy for our applicators to reach for external mastic. Neighbouring places we cover for external mastic include Aperfield (1 mile south-east), Luxted (1 mile north-east), Berry's Green (1 mile east), Single Street (1 mile east) and Leaves Green (2 miles north). Within a short drive, we also cover London (14 miles north-west), Whitechapel (15 miles north), Brompton (15 miles north-west), Stockwell (13 miles north-west), Orpington (6 miles north-east) and Wimbledon (13 miles north-west).
Near you in Biggin Hill
Typical jobs here are in homes near Charles Darwin School and the streets around them. For rail, the closest station is Woldingham station, roughly 3.8 miles south-west. Other landmarks nearby include Warlingham Park Hospital (2.7 miles west). Green spaces nearby include Betsom's Hill and West Kent Golf Course nature reserve.
Also near Biggin Hill
Also in Biggin Hill
What affects the quote in Biggin Hill
We do not publish a price list. What we look at:
- Access and height
- The amount of work
- Whether there’s mould to deal with
- When we can work, for business premises
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you’re unsure, call 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- A few pictures by email, if you can
- Where the property is
- Access, such as stairs, a lift or height
- Whether it’s a home or a business
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
Biggin Hill: your questions answered
Is parking a problem for a job in Biggin Hill?
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 Woldingham station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll send you a clear quote.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Will you leave a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Is the work guaranteed?
Yes. All our work carries a 12-month guarantee.
When will the joints need doing again?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year and reseal when it splits.
The process
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to several days, depending on the building. In Biggin Hill, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- On commercial sites, let us know about site rules
- Mention any leaks or damp you’ve noticed
How to get a quote
Every job is quoted individually, so the first step is telling us about yours. Just call 0345 464 0079 or send us an email with the details and send pictures if you have them.
Read more
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Leave the joints unpainted unless we have said otherwise
- Tell anyone working on the walls about the movement joints
- Act on the first splits you see
- Look over the joints every year, ideally after winter
Do not paint over the new sealant unless we’ve said the product is paintable. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.