Kent · England
Sand mastic for sash & case windows in Speed Gate, Kent
Window and door surrounds in Speed Gate need attention? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- A silicone bead on a sash window that spoils the look
- Tired mastic found when preparing windows for paint
- Gaps where the frame meets the masonry
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Speed Gate and across Kent. We can quote a run of properties together, and we are fully insured.
Letting agents and landlords in Speed Gate can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
Sand mastic for homes and businesses in Speed Gate
If your home is listed or in a conservation area, check with your local planning authority whether consent is needed for work to windows. Sand mastic is often favoured as a like-for-like material. We work on period & listed homes, timber door frames and stone surrounds, and common reasons people get in touch are old sand mastic that has cracked, crumbled or fallen out and draughts and rain around sash boxes.
Outdoor sealant needs dry, clean surfaces, so work on frames around Speed Gate is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
All our work is covered by our one-year guarantee, wherever you are in Kent.
- Where
- Speed Gate (DA3)
- Region
- Kent
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How it works
You don’t need to clear the whole room or building, just the space around the work. Everything nearby is protected, and the job takes a few hours for a single window, longer for several for a typical job. Somewhere like Speed Gate needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Before we arrive
- Move anything stored near the joints
- For indoor joints, keep the area dry beforehand if you can
- Let us know if you’ve seen damp or leaks
Get a quote
Every job is quoted individually. Just phone 0345 464 0079 or drop us an email with the details and send pictures if you have them.
Related advice
DIY sealant or a professional job?
If you’re 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 doesn’t work out, we can still put it right.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
Also near Speed Gate
More services for Speed Gate
Different surfaces, different methods
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
Sand mastic in Speed Gate: local notes
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Lullingstone Castle (about 3.2 miles west) nearby, there’s older building stock in the area around Speed Gate as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For site and facilities teams at buildings such as Longfield Academy, larger buildings have plenty of frames, and the mastic around each one ages. Historic houses such as Lullingstone Castle, about 3.2 miles west, show how far back building around Speed Gate goes, and older homes nearby need a sealant that suits their walls.
Speed Gate is about 5 miles south of Dartford, in Kent. Whether you’re in the middle of Speed Gate or further out, we cover sand mastic for every kind of property. 922 places in Kent are on our list. For nearby work, see our London page (18 miles or so).
Postcode districts we cover here for sand mastic: DA3. If you are just outside Speed Gate, we cover Fawkham Green (1 mile south-east), West Yoke (1 mile east), Ash (1 mile south-east), Maplescombe (2 miles south-west) and West Kingsdown (2 miles south). Within a short drive, we also cover Maidstone (13 miles south-east), Dartford (5 miles north), Sevenoaks (7 miles south-west), Gravesend (6 miles north-east), Tonbridge (12 miles south) and Northfleet (5 miles north-east).
What’s near Speed Gate
Typical jobs here are in homes near The Rising Sun pub and the streets around them. For rail, the closest station is Longfield station, roughly 2.3 miles north-east of the centre. Other landmarks nearby include Darent Valley Hospital (4.5 miles north) and Eynsford Castle (2.4 miles west).
Speed Gate questions
Do you cover smaller places like Speed Gate?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Speed Gate for sand mastic?
Yes. We work across London and the South East, and Speed Gate is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Can old silicone round a sash window be swapped for sand mastic?
Normally, yes. With the silicone removed and the joint cleaned we point it with sand mastic.
How much does sand mastic cost in Speed Gate?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Should I use sand mastic or silicone?
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.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
What guarantee comes with the work?
Our one-year guarantee covers every job.
Why act early in Speed Gate
An open joint round the frame lets weather in. Left, water can reach the timber and the wall so renewing it early protects the window. Older cottages and farmhouses around Speed Gate can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
What you pay reflects the work, not guesswork. That is why we ask about the job first and agree the price before starting.
Why book with us
- A 12-month guarantee on all work
- Quality sealants from Arbo and Everbuild
- Old sealant always removed completely
- 4.9 on Google from 180+ five-star reviews
Take a look at how sealant jobs are priced and our reviews.
Aftercare tips
After the cure time, these simple habits help:
- Ask the planning authority about consent for listed or conservation-area homes
- Sort the mastic before the decorators arrive
- Ask us before painting near the mastic
- Take care around the mastic when scraping paint
Leave the new mastic alone while it firms up. It forms a skin fairly soon, but takes longer to harden fully.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
Do you need sand mastic in Speed Gate?
Shallow joints are a common cause. A thin layer doesn’t hold well, which is why we pack deep voids first and get the depth right.
Keep an eye out for any of the following:
- Cracked mastic round a front door frame
- Modern sealant on a period surround
- Cement or filler used on old window joints that has cracked
- Draughts and rain around sash boxes
Rented homes near Longfield station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Before booking anyone
- Whether VAT is included
- How the surfaces are prepared before sealing
- When the joint can take water or movement
- Whether they seal over old material or remove it