Kent · England
Hockenden Sand Mastic
Sand mastic for Hockenden, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Cracked mastic round a front door frame
- Mastic dropping out of the joint
- Gaps between timber frames and stone or brick
Sand mastic in Hockenden
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. Common call-outs are for mastic worn away on windows facing the weather and open joints round the window box, across timber door frames, sash and case windows and stone surrounds.
Around Hockenden, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Every job comes with a one-year guarantee, wherever you are in Kent.
- Where
- Hockenden (BR8)
- Region
- Kent
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What we cannot put right
A few problems are outside what sealant work can do:
- Sashes that need overhauling
- Broken panes
- Timber that has rotted
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
Joints and surfaces we work on
- Sash and case windows
- Tenement windows
- Stone surrounds
- Period & listed homes
- Timber door frames
- Brick reveals
What we are called out for in Hockenden
Shallow joints are a common cause. Mastic that is too thin cracks and drops out so we make sure the new mastic is the right thickness.
Signs it’s time to call us include:
- Gaps between timber frames and stone or brick
- Crumbling sand mastic round a window
- Draughty sash windows at the surround
- Modern sealant on a period surround
In the older streets around St Mary the Virgin, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
What to look for in a quote
- How much experience the applicator has
- Are they insured?
- How long to leave it before use
- Is VAT in the price?
Hockenden: your questions answered
Is Hockenden within the area you cover?
Yes, Hockenden is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
I let a flat near Swanley station. Can you help?
Yes. We work for landlords and agents as well as householders. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll send you a clear quote.
Is consent needed for window work on a listed home?
Check with your local planning authority. They’ll tell you if consent is needed for work to your windows.
Is it possible to take out silicone and use sand mastic instead?
Yes, it’s a common request. All the old silicone is removed first so the mastic beds in well.
Do you guarantee sand mastic work?
Our 12-month guarantee covers every job.
What’s sand mastic made of?
It’s sand mixed with a linseed-oil-based binder for the joint between timber frames and masonry.
Is sand mastic better than silicone for my windows?
For period timber windows in stone or brick, sand mastic is often the better fit. On modern frames, we’d normally use a flexible sealant, and we will explain why.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Frames and glazing around Hockenden
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Hall Place and Gardens (about 3.2 miles north) nearby, there’s older building stock in the area around Hockenden as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
If you let a flat or house near Swanley station, older sash windows in a rental need their mastic kept sound to keep the weather out. Schools such as Horizon Primary Academy are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Hockenden is about 2 miles north-east of Orpington, in Kent. Jobs in Hockenden get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 922 towns and villages across Kent, from the larger towns to small villages. You can also see our page for London, roughly 13 miles from Hockenden.
Postcode districts we cover here for sand mastic: BR8. Close by, we work in Upper Ruxley (1 mile north-west), Stonehill Green (1 mile north-east), Ruxley (1 mile north-west), Puddledock (2 miles north-east) and Hextable (2 miles north-east). Larger places within reach include Dartford (4 miles north-east), Sevenoaks (8 miles south), Gravesend (10 miles east), Tonbridge (15 miles south), Northfleet (9 miles east) and Kings Hill (14 miles south-east).
Local landmarks in Hockenden
Locally, jobs take us to homes and businesses close to Orchards Academy and Foots Cray Meadows and the streets around them. The nearest railway station is Swanley station, about 1 mile south-east of the centre. Nearby you’ll also find London Borough of Bromley Museum (2.6 miles south-west) and Eynsford Castle (3.4 miles south-east). The countryside around Hockenden includes The Warren and Summer Hill.
What happens if it’s left?
Not every filler suits an old window surround. Sand mastic matches what was there and that can be important for listed homes. Around Hockenden, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Why book with us
- A 12-month guarantee on all work
- Sanitary silicone with an anti-fungal additive in wet areas
- Full insurance on every job
- Tidy, careful work
Read our cost guide and our reviews.
How the visit works
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes a few hours per window, depending on the condition of the joints, depending on the size of the job. Somewhere as small as Hockenden, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any previous sealing or DIY attempts
- Plan for the work area to be out of bounds to pets and children
How to get a quote
If you are in Hockenden and need sand mastic, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Related advice
Also near Hockenden
Also in Hockenden
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Take care around the mastic when scraping paint
- Inspect the joints round the windows every year or so
- Plan mastic work ahead of painting
- Ask us before painting near the mastic
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
Can I do it myself?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
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.
Different surfaces, different methods
Stone surrounds
The stone is treated with care when the old mastic comes out.
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.