Kent · England
External Mastic in Boxley
Sealing brickwork movement joints, render, cladding and façade joints for Boxley, backed by a 12-month guarantee. Call for a quick quote.
- Old sealant gone brittle and cracked
- Movement joints filled with mortar instead of sealant
- Failed seals between different materials
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
External mastic in Boxley
For buildings in Boxley, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. We work on façade panels, brickwork movement joints and joints between brick and frames, and the jobs we see most are joints where the bead has come unstuck and moss and dirt in joints with no sealant left.
Older homes in small places like Boxley may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water generally gets in.
There’s a 12-month guarantee on every job.
- Location
- Boxley (ME14)
- Region
- Kent
- Cover
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of external mastic
The price is agreed before any work begins. It takes into account:
- The type of sealant required
- Any mould that needs treating
- Working hours on commercial sites
- How many areas need sealing
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
What to tell us for a quote
When you contact us, these details help:
- Whether it has been sealed before
- How we’d reach the joints
- Where the job is, and your postcode
- The type of property
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will come back to you with a quote.
Landlords, agents and businesses in Boxley
We work for letting agents and landlords as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
How the visit works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take anything from a few hours to several days, depending on the building. In a small place like Boxley, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about parking restrictions
How to get a quote
We quote each job on its own. Simply phone 0345 464 0079 or drop us an email and describe the job.
Related advice
Nearby places to Boxley
Other services in Boxley
When something else is needed
To be straight with you, some problems need a different trade:
- Loose or hollow render, which needs re-rendering
- Cracked brickwork or render that needs a builder or plasterer
- Adding movement joints to masonry that has none
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
Where we work in Boxley
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
- Copings & trims
- Façade panels
Outside joints around Boxley
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Stoneacre (about 4 miles south) nearby, there’s older building stock in the area around Boxley as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
For site and facilities teams at buildings such as Sandling Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. If you live in an older home near St Mary's and All Saints Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. For landlords with property near Maidstone East station, outside joints that have cracked can let damp into a rental, so check them between lets.
Boxley is about 3 miles north of Maidstone, in Kent. Anywhere in ME14, our applicators can take on external mastic. Boxley is one of 922 towns and villages in Kent we cover for external mastic. You can also see our page for Chelmsford, about 30 miles away.
Postcode districts we cover here for external mastic: ME14. That includes homes and businesses on The Street, Styles Lane and Pilgrims Way. We also cover Dunn Street (2 miles north-east), Lidsing (2 miles north-east), Kit's Coty (2 miles north-west), Lordswood (2 miles north) and Scragged Oak (2 miles north-east). We also work in nearby towns such as Maidstone (3 miles south), Sittingbourne (9 miles east), Gravesend (11 miles north-west), Tonbridge (14 miles south-west), Faversham (15 miles east) and Northfleet (12 miles north-west).
What’s near Boxley
We work in homes and buildings around Valley Park School, The King's Arms and The Larches. For rail, the closest station is Maidstone East station, about 2.2 miles south-west of the centre. A little further out are KIMS hospital (1.4 miles south) and Allington Castle (1.6 miles south-west). Open spaces near Boxley include Burham Down and Boxley Hills.
How the job changes by surface
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind.
Questions from Boxley
Is Boxley in your area for external mastic?
Yes. Our work covers London and the South East, and Boxley is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
Will you come out to Boxley?
Yes, Boxley is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Boxley.
I’m a tenant. Can you help?
Of course. Check with your landlord; we can send the quote to them too.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Can a movement joint be filled with mortar?
No. A mortar-filled joint can’t move, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
Do you have insurance?
Yes. Mr Mastic is fully insured.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin, matched as closely as the range allows.
Why deal with it now?
Sealing over the top of old mastic does not hold for long. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. In a small place like Boxley, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first.
Why us?
- We never seal over old sealant
- A 12-month guarantee on all work
- Domestic, commercial and hotel work
- White, clear, grey or coloured to suit, where the product allows
Read our cost guide or what customers say.