Kent · England
Sand mastic for sash & case windows in Green Street Green, Kent
Problem with your window and door surrounds in Green Street Green? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Wind and rain getting in round a sash window
- A silicone bead on a sash window that spoils the look
- Weathered mastic on the most exposed windows
Common questions in Green Street Green
Can you do sand mastic in Green Street Green?
Yes, Green Street Green is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Will you come out to Green Street Green?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can I paint the new mastic?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
I’m a tenant. Can you help?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
How do I get a quote for sand mastic in Green Street Green?
Size, access and the old material all affect the cost. Call for a quick quote.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
How long does sand mastic take to go off?
It forms a skin fairly soon, then hardens over a longer period. Timing depends on the weather and the joint.
Sand mastic for homes and businesses in Green Street Green
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 are often asked to deal with gaps where the frame meets the masonry and crumbling sand mastic round a window, across timber door frames, sash and case windows and tenement windows.
Around Green Street Green, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Your job is guaranteed for a year, as with all our work.
- Place
- Green Street Green (DA2)
- Wider area
- Kent
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Cracked or broken glass
- Whether work needs listed building consent
- Masonry that needs repairing
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Surfaces we seal
- Timber door frames
- Stone surrounds
- Brick reveals
- Sash and case windows
- Tenement windows
- Period & listed homes
How we quote for sand mastic
We do not publish a price list. The quote depends on:
- The product the joint needs
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- Any working-time requirements on site
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we will go through it with you.
Helping us quote
Photos help, but a description is a good start. Please mention:
- A few photos by email, if you can
- If it’s domestic, commercial or a hotel
- Access, such as stairs, a lift or height
- If someone has resealed it before
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, ring 0345 464 0079 or drop us an email.
Why act early in Green Street Green
Not every filler suits an old window surround. Sand mastic matches what was there and that can be important for listed homes. Older cottages and farmhouses around Green Street Green can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Why Green Street Green clients choose us
- Full insurance on every job
- More than 20 years in sealant work
- Any old sealant cut out fully, not covered over
- ARBOMaster approved applicator
See our cost guide and what customers say.
How the job changes by surface
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. We rake it out and renew it.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Don’t paint over the new mastic
- Check with your local planning authority if your home is listed
- Keep sills and gutters clear so water drains away
- Take care around the mastic when scraping paint
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
What we do, step by step
At the end, we look at the finished work together and tell you how long to leave it. The visit itself normally takes a few hours per window, depending on the condition of the joints, depending on how much there is to do. In a small place like Green Street Green, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Try not to wet indoor joints just before the visit
- Keep children and pets away from the work area
- Tell us about any previous sealing or DIY attempts
Getting a quote
We do not publish a price list. Instead, we give you a clear quote for your job. To get started, ring 0345 464 0079 or send us an email.
Related advice
Nearby places to Green Street Green
Other services in Green Street Green
What sand mastic looks like in Green Street Green
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.
Managing a site like Greenlands Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. For landlords with property near Longfield station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Green Street Green is about 3 miles south-east of Dartford, in Kent. For sand mastic in and around Green Street Green, please phone 0345 464 0079 or send us an email for a quick quote. We cover Kent from our Crawley base. Across Kent, we cover 922 places, and Green Street Green is one of them. London is on our list too, around 17 miles away.
Jobs for sand mastic in DA2 works the same way as everywhere else we cover. We also cover the places around Green Street Green: Grubb Street (1 mile south), Westwood (1 mile east), St Margarets (1 mile west), Bean (1 mile north) and Darenth (1 mile north-west). Within a short drive, we also cover Maidstone (15 miles south-east), Dartford (3 miles north-west), Sevenoaks (10 miles south-west), Gravesend (5 miles east), Tonbridge (15 miles south) and Northfleet (3 miles north-east).
Landmarks near Green Street Green
Typical jobs here are in homes near Beacon Wood Country Park, Longfield Academy and The Black Horse pub and the streets around them. The nearest railway station is Longfield station, about 1.5 miles south-east. Other landmarks nearby include Bluewater (1.8 miles north) and Stone Castle (2.1 miles north). Green spaces nearby include Wansunt Pit and Sawyers Lake.