Kent · England
Sand mastic for sash & case windows in Larkfield, Kent
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Larkfield. Fully insured, ARBOMaster approved and guaranteed for a year.
- Old sand mastic that has cracked, crumbled or fallen out
- Silicone on a period window that looks wrong
- Patchy fillers round a sash window
Surface by surface
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Sand mastic in Larkfield, done properly
A silicone bead around a sash window can look out of place and isn’t always the right material. Sand mastic is the traditional choice and we can swap the silicone for it. We work on tenement windows, stone surrounds and sash and case windows, and people most often call us about mastic that needs renewing before redecorating and cracked mastic round a front door frame.
Homes in small places like Larkfield often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or email us.
- Where
- Larkfield (ME20, ME19)
- Region
- Kent
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Larkfield
There’s no set price list, because jobs vary so much. What we look at:
- The number and length of the joints
- How many rooms, windows or areas are involved
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- Any access issues, like height or stairs
- Where the property is
- The type of property
- What the problem is, such as mould, gaps, leaks or cracking
If you’re in Larkfield and need sand mastic, 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.
Larkfield questions
I let a flat near New Hythe station. Can you help?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Do you cover smaller places like Larkfield?
Yes, Larkfield is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
How long does sand mastic take to go off?
It skins over fairly quickly but takes longer to harden fully. We will explain what to expect before we leave.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Will there be a smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
What do you put in the joint?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Do you offer different sealant colours?
Yes. Sealants come in white, clear, grey and other colours, and we agree the colour with you before any work starts.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
What we are called out for in Larkfield
Water gets into small cracks in the mastic and loosens it further. Exposed elevations usually fail first.
Common reasons people contact us include:
- Gaps between timber frames and stone or brick
- Old cement repairs round a window that have failed
- Mastic dropping out of the joint
- Draughty sash windows at the surround
In the older streets around Church of the Holy Trinity, the joint between an old wall and a newer frame is normally the first place rain gets in.
Comparing quotes
- What the quote includes, VAT included or not
- When the joint can take water or movement
- How long the guarantee is
- Whether they’re fully insured
Leave it or put it right?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic suits the building and finishes neatly against the masonry. Where a wall is exposed, as many are in small places like Larkfield, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email.
Why choose Mr Mastic in Larkfield
- Any old sealant cut out fully, not covered over
- 12-month guarantee on every job
- Fully insured
- Neat joints and a tidy finish
Take a look at how sealant jobs are priced or customer reviews.
DIY versus a professional finish
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
Frames and glazing around Larkfield
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. Historic houses like Starkey Castle (about 4.3 miles north) are a reminder that the area around Larkfield 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.
Schools such as Brookfield Junior School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Rented homes near New Hythe station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Larkfield is about 4 miles north-west of Maidstone, in Kent. Anywhere in ME20, we can carry out sand mastic at your property. Larkfield is one of 922 towns and villages in Kent we cover. London is on our list too, about 27 miles from Larkfield.
All of ME20 and ME19 is within our area for sand mastic. We cover properties on Martin Square, London Road and New Hythe Lane and the roads around them. We also cover the places around Larkfield: Lunsford (1 mile north), Leybourne (1 mile west), New Hythe (1 mile north-east), Birling (2 miles north-west) and Snodland (2 miles north). Further out, we also cover Maidstone (4 miles south-east), Sittingbourne (13 miles east), Dartford (14 miles north-west), Sevenoaks (11 miles west), Royal Tunbridge Wells (14 miles south-west) and Gravesend (9 miles north).
Local landmarks in Larkfield
Locally, jobs take us to homes and businesses close to The Malling School, The Malling School and Leybourne Lakes Country Park. Larkfield’s nearest station is New Hythe station, about 1 mile north-east. Nearby you’ll also find Fremlin Walk (3.9 miles south-east) and Leybourne Castle (0.9 miles west). For a walk, there’s Burham Down and Blue Bell Hill.
How to look after the new joints
Looking after new joints is easy:
- Check with your local planning authority if your home is listed
- Avoid heavy scraping on the mastic joint
- Do not paint over the new mastic
- Clear gutters so water doesn’t pour onto the windows
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
More services for Larkfield
How the visit works
You do not need to clear the whole room or building, just the space around the work. Everything nearby is protected, and the work takes a few hours per window, depending on the condition of the joints for a typical job. Somewhere as small as Larkfield, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Clear items away from the joints we are working on
- Keep pets and children clear of the area while we work
How to get a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.