Kent · England
Otford Sand Mastic
Specialist sand mastic for Otford: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Cracked mastic round a front door frame
- Modern sealant on a period surround
- Draughts and rain around sash boxes
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Timber that has rotted
- Damaged stone surrounds
- Putty and glazing repairs
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Period & listed homes
- Sash and case windows
- Timber door frames
- Tenement windows
- Brick reveals
- Stone surrounds
Sand mastic in Otford
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. If you have patchy fillers round a sash window and window mastic to renew ahead of painting, we can help, whatever the surface.
Around Otford, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Otford (TN14)
- Wider area
- Kent
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How the job changes by surface
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
Stone surrounds
Stone openings are rarely perfectly straight, so the gap is not the same all the way round. Sand mastic is shaped by hand to suit.
What we do, step by step
The work is kept neat and contained to the joints we are treating, so you can get on with your day. Expect the work to take a few hours per window, depending on the condition of the joints. Parking around Otford is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Let us know about stairs, lifts or work at height
- Tell us about any water getting in
- Mention any sign-in or site rules at work premises
Get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Advice
Towns and villages near Otford
More services for Otford
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Don’t run silicone over sand mastic
- Get any rot dealt with first
- Check with your local planning authority if your home is listed
- Plan mastic work ahead of painting
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
For landlords and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Frames and glazing around Otford
With historic houses such as Knole House (about 3.2 miles south) nearby, there’s older building stock in the area around Otford as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you let a flat or house near Otford station, older sash windows in a rental need their mastic kept sound to keep the weather out. If you look after a building such as Otford Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Otford is about 2 miles north of Sevenoaks, in Kent. Whether you are in the middle of Otford or further out, sand mastic is available for homes and businesses alike. Our Kent coverage runs to 922 places, Otford among them. Our London page covers work nearby, about 18 miles away.
Jobs for sand mastic in TN14 works the same way as everywhere else we cover. Sand mastic is available to properties on Station Road, High Street and Bubblestone Road. Neighbouring places we cover for sand mastic include Twitton (1 mile west), Shoreham (2 miles north), Sepham Heath (2 miles north-west), Halstead (3 miles north-west) and Badgers Mount (3 miles north-west). Within a short drive, we also cover Maidstone (15 miles east), Dartford (9 miles north), Royal Tunbridge Wells (13 miles south), Gravesend (12 miles north-east), Tonbridge (9 miles south-east) and Northfleet (11 miles north-east).
Landmarks near Otford
Typical jobs here are in homes near Knole Academy, The Woodman pub and Fackenden Down, among other places. There’s a railway station in Otford itself: Otford station. Other landmarks nearby include Kemsing Castle Bank (1.7 miles east) and Otford Heritage Centre (within half a mile south-east). Green spaces nearby include Dryhill Nature Reserve.
What we’re called out for in Otford
Previous repairs in cement or silicone often trap water or crack away. They do not suit the joint, and they generally need raking out.
Look out for these signs:
- Old sand mastic that has cracked, crumbled or fallen out
- Failed mastic on an exposed elevation
- Open joints round the window box
- Cracked mastic round a front door frame
If you live in an older home near Church of St Bartholomew, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Before you book anyone
- What product goes in the joint
- What insurance they hold
- What the cure time is
- Is the old sealant removed completely?
Otford questions
Can you help a landlord with a rental near Otford station?
Yes. We work for letting agents and landlords as well as householders, and several properties can go on one quote. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Can you do sand mastic in Otford?
Yes, Otford is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and let us know what needs doing.
How long does sand mastic take to go off?
The surface skins quite quickly, then hardens over a longer period. Timing depends on the weather and the joint.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Should I use sand mastic or silicone?
Sand mastic usually suits period timber windows best. Modern frames normally suit a flexible sealant, and we’ll explain why.
Can you replace silicone on a period window with sand mastic?
Usually, yes. With the silicone removed and the joint cleaned we point it with sand mastic.
Do I need permission for sand mastic on a listed building?
Your local planning authority is the one to ask. They’ll tell you if consent is needed for work to your windows.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.