Kent · England
Sand mastic for sash & case windows in Kennington, Kent
Window and door surrounds in Kennington need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Old sand mastic that has cracked, crumbled or fallen out
- Draughty sash windows at the surround
- Mastic worn away on windows facing the weather
Sand mastic in Kennington, done properly
Sand mastic doesn’t last for ever, leaving gaps round the window. Renewing it closes the gap and tidies the surround. We work on timber door frames, tenement windows and sash and case windows, and common reasons people get in touch are cement or filler used on old window joints that has cracked and gaps between timber frames and stone or brick.
Around Kennington, 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.
Our work is backed for twelve months.
- Where
- Kennington (TN24, TN25)
- Wider area
- Kent
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Kennington: your questions answered
Do you cover Kennington for sand mastic?
Yes. Our work covers London and the South East, and Kennington is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
I let a flat near Ashford International station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
How long does sand mastic take to go off?
It skins over fairly quickly but takes longer to harden fully. We’ll explain what to expect before we leave.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Is it possible to take out silicone and use sand mastic instead?
Generally, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
Should I use sand mastic or silicone?
We’ll talk it through with you. Sand mastic suits many period homes, and modern sealants suit newer frames.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Is the work guaranteed?
There’s a 12-month guarantee on every job.
When something else is needed
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant will not put right:
- Cracked or broken glass
- Sash cords, weights and draught-proofing of the sashes
- Masonry that needs repairing
If you are not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
Where we work in Kennington
- Brick reveals
- Stone surrounds
- Sash and case windows
- Period & listed homes
- Tenement windows
- Timber door frames
How the job changes by surface
Sash and case windows
Most of our sand mastic work is on sash windows. We renew the mastic round each box.
Timber door frames
Sand mastic is used round timber door frames too. The method is the same as for windows.
Nearby places to Kennington
Other services in Kennington
Sand mastic in Kennington: local notes
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Godinton House (about 2.3 miles west) are a reminder that the area around Kennington has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
In the older streets around Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Schools such as Kennington Church of England Academy are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Kennington is about 2 miles north-east of Ashford, in Kent. If you need sand mastic in Kennington, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We are based in Crawley and cover Kent, Kennington included. Our Kent coverage runs to 922 places, Kennington among them. We also work in Chelmsford, about 43 miles from Kennington.
Work in TN24 and TN25 works the same way as everywhere else we cover. If you need sand mastic at a property on Park Road, York Road and Ball Lane or a nearby road, our applicators can take on the job. You’ll find Kennington on the A28, so it’s easy for us to get to. If you are just outside Kennington, we cover Bockhanger (1 mile south-west), Potters Corner (1 mile west), Boughton Lees (2 miles north), Godinton (2 miles south-west) and Willesborough (2 miles south). Within a short drive, we also cover Canterbury (12 miles north-east), Sittingbourne (14 miles north-west), Folkestone (13 miles south-east), Whitstable (14 miles north-east), Faversham (10 miles north) and Hythe (11 miles south-east).
Local landmarks in Kennington
Locally, jobs take us to homes and businesses close to Towers School and Sixth Form Centre, Conningbrook Lakes Country Park and The Rose Inn. The closest station to Kennington is Ashford International station, roughly 1.7 miles south. Nearby you’ll also find County Square (1.4 miles south-west) and William Harvey Hospital (2.1 miles south-east). Open spaces near Kennington include Hatch Park.
Quotes for sand mastic in Kennington
The quote reflects the job in front of us. We look at:
- Access and height
- Whether old sealant or filler has to be cut out
- When we can work, for business premises
- How many rooms, windows or areas are involved
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What we need to know
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- The problem you’ve noticed
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
- A few pictures by email, if you can
There’s no standard price list. Instead, we give you a clear quote for your job. To get started, call 0345 464 0079 or email us.
Should I try it myself first?
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. All the old material has to come out first.
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
Do you need sand mastic in Kennington?
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint.
If you can see any of these, it’s time to have the joints looked at:
- Mastic dropping out of the joint
- Cement or filler used on old window joints that has cracked
- Mastic that needs renewing before redecorating
- Draughts and rain around sash boxes
If you let a flat or house near Ashford International station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Comparing quotes
- Who turns up on the day
- When the joint can take water or movement
- What preparation is included
- Which colour the sealant will be
What we do, step by step
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours per window, depending on the condition of the joints. Parking around Kennington is generally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Let us know about parking restrictions
- Mention any sign-in or site rules at work premises
- Mention if the joints have been sealed before
Ask for 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 talk you through the work and send you a clear quote.
Read more
What happens if it’s left?
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. In a smaller place like Kennington, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Why Kennington clients choose us
- Anti-fungal silicone where joints get wet
- Rated 4.9 stars on Google
- Any old sealant cut out fully, not covered over
- Neat joints and a tidy finish