Kent · England
Boxley Sand Mastic
Sand mastic for Boxley and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Failed mastic on an exposed elevation
- A silicone bead on a sash window that spoils the look
- Cracked mastic round a front door frame
Quotes for sand mastic in Boxley
Every job gets its own quote. This is what makes a difference:
- The size of the job
- Whether old sealant or filler has to be cut out
- Mould in or behind the old joints
- How many rooms, windows or areas are involved
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. The price is agreed before we begin.
What to tell us for a quote
When you contact us, it’s useful to know:
- The type of property
- The address or postcode of the job
- Pictures of the joints, sent by email
- The problem you’ve noticed
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
About our sand mastic in Boxley
Sand mastic skins over fairly quickly but full hardening takes longer. Traditionally, sand mastic is left unpainted, so ask us before you decorate. If you have gaps where the frame meets the masonry and modern sealant on a period surround, we can help, on sash and case windows, brick reveals and period & listed homes alike.
Outdoor sealant needs dry, clean surfaces, so work on frames around Boxley is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
We stand behind the work with a 12-month guarantee.
- Where
- Boxley (ME14)
- Region
- Kent
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near Boxley
Also in Boxley
What we can’t put right
In fairness, some problems need a different trade:
- Sash cords, weights and draught-proofing of the sashes
- Planning or listed building consent (your local planning authority decides)
- Crumbling stone or brickwork round the window
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Surfaces we seal
- Sash and case windows
- Stone surrounds
- Brick reveals
- Timber door frames
- Period & listed homes
- Tenement windows
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Do not run silicone over sand mastic
- Look over the window mastic once a year
- Plan mastic work ahead of painting
- Go gently near the mastic when preparing windows
Leave the new mastic unpainted, as traditional guidance advises. If you’re redecorating, ask us first.
Sound mastic protects the frame. Failed mastic lets water reach the timber and timber that stays wet can rot.
What happens if it’s left?
If you are redecorating, renew the mastic first. Painting over failed mastic does not seal it and traditional guidance is to leave the new mastic unpainted. Around Boxley, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re unsure, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why choose Mr Mastic in Boxley
- 4.9 on Google from 180+ five-star reviews
- Domestic, commercial and hotel work
- Sanitary silicone with an anti-fungal additive in wet areas
- More than 20 years in sealant work
Take a look at what affects the cost or what customers say.
Boxley homes and the weather
Historic houses like Stoneacre (about 4 miles south) are a reminder that the area around Boxley has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
Homes close to St Mary's and All Saints Church include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in. For site and facilities teams at buildings such as Sandling Primary School, larger buildings have plenty of frames, and the mastic around each one ages. Letting a property close to Maidstone East station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Boxley is about 3 miles north of Maidstone, in Kent. Every kind of property in Boxley is covered for sand mastic. The work is guaranteed for a year. Our Kent coverage runs to 922 places, Boxley among them. We also work in Chelmsford, about 30 miles from Boxley.
Every address in ME14 is covered for sand mastic. We cover properties on The Street, Styles Lane and Pilgrims Way and the roads around them. Nearby, we also carry out sand mastic in 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). Larger places within reach include 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
Around Boxley, our work takes us to homes and buildings near Valley Park School, The King's Arms and The Larches, among other places. The closest station to Boxley is Maidstone East station, roughly 2.2 miles south-west. 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.
FAQs for Boxley
Can you do sand mastic in Boxley?
Yes, Boxley is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
I let a flat near Maidstone East station. Can you help?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or email us with the details for a clear quote.
Does someone need to be in?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
Is sand mastic better than silicone for my windows?
That depends on your windows. On many period windows, sand mastic looks right and suits the building and newer frames normally get a flexible sealant.
Do I need permission for sand mastic on a listed building?
Yes, it’s worth checking. Ask your local planning authority whether consent is needed for work on a listed home or in a conservation area.
How long will you be here?
It depends on the size of the job, but most jobs take a few hours per window, depending on the condition of the joints. We’ll give you a better idea when we quote.
What guarantee comes with the work?
All our work has a 12-month guarantee, and we are fully insured.
Where are you based?
We are a Crawley-based firm. We work across South East England, London and Scotland.
Landlords, agents and businesses in Boxley
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we are fully insured for the work.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Should I try it myself first?
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.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
What happens on the day
Most of a good job is in the preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it normally takes a few hours per window, depending on the condition of the joints. In a small place like Boxley, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Tell us if parking is tricky
- Mention any tricky access
- Tell us about any previous sealing or DIY attempts
Getting a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.