Kent · England
Greenhithe Window Mastic
Mastic around window and door frames, sills and patio doors for Greenhithe, backed by a one-year guarantee. Ask us for a quote.
- Draughts coming in around windows and doors
- Rain getting in at the frame or under the sill
- Hard, cracked sealant around windows
About our window mastic in Greenhithe
The new joint does not have to be white. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. We work on composite doors, uPVC windows and aluminium frames, and people most often call us about a bead that doesn’t match the frame and gaps between the frame and the inside reveal.
In a smaller place like Greenhithe, some walls face open ground and catch the full force of the weather. The mastic around frames on those walls tends to age faster.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Greenhithe (DA9, DA10)
- Region
- Kent
- Cover
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A tidy bead in anthracite grey, black or a matching colour keeps the clean look.
Window sills
Sills catch the water running down the glass, so the joints at each end and underneath matter. They’re cut out and resealed with exterior sealant.
Questions from Greenhithe
Will you come out to Greenhithe?
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.
I let a flat near Greenhithe for Bluewater station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can be quoted together. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Which products do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Do you remove the old sealant?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Can new window sealant be painted?
Not usually, if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
Will it make a mess?
We keep the work tidy. Nearby surfaces are protected, and the area is left clean when we finish.
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Wash the frames with mild soapy water
- Wipe condensation off the frames
- Do not paint over the silicone
- Keep drainage slots and sill grooves clear
Try not to touch the new joint while it cures, following the cure time we give you. Do not point a pressure washer at the joints.
Leaks normally show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
How we quote for window mastic
Every job gets its own quote. These are the things that affect it:
- Which sealant suits the joint
- Any mould that needs treating
- The number of rooms or windows
- How easy the joints are to reach
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
What to tell us for a quote
What to tell us when you ask for a quote:
- If it’s domestic, commercial or a hotel
- Whether it has been sealed before
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. Whenever you’re ready, ring 0345 464 0079 or send us an email.
Landlord and commercial work in Greenhithe
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
For anyone letting property in or around Greenhithe, several properties can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Greenhithe homes and the weather
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Greenhithe for Bluewater station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. Schools such as Knockhall Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Homes close to Church of St Mary include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Greenhithe is about 3 miles east of Dartford, in Kent. Anywhere in DA9, we can carry out window mastic at your property. Greenhithe is one of 922 places in Kent we cover for window mastic. For nearby work, see our London page (17 miles or so).
All of DA9 and DA10 is covered for window mastic. We cover properties on Bean Road, The Avenue and Abbey Road. Greenhithe sits on or near the A206, which makes travel easy. Neighbouring places we cover for window mastic include Swanscombe (1 mile south-east), Stone (1 mile south-west), Bean (2 miles south), West Thurrock (2 miles north) and Darenth (2 miles south-west). Further out, we also cover Dartford (3 miles west), Sevenoaks (12 miles south), Gravesend (4 miles east), Northfleet (3 miles south-east), Swanley (6 miles south-west) and Kings Hill (13 miles south-east).
What’s near Greenhithe
In Greenhithe, that means homes and buildings near Castle Hill Park, The Ebbsfleet Academy and The White Hart Public House and the streets around them. There’s a railway station in Greenhithe itself: Greenhithe for Bluewater station. Nearby you’ll also find Darent Valley Hospital (1.5 miles south-west) and Stone Museum of Geology (1.8 miles west). The countryside around Greenhithe includes Chafford Gorges Nature Park and Sawyers Lake.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Why it’s worth doing now in Greenhithe
Redecorating is a good moment to renew the mastic. Fresh joints finish the job neatly. Homes in smaller places like Greenhithe can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or email us and we’ll talk you through it.
Why choose Mr Mastic in Greenhithe
- Homes, businesses and hotels
- Fully insured
- Old sealant always removed completely
- A 12-month guarantee on all work
Also near Greenhithe
What else we do in Greenhithe
What happens on the day
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes a morning for a couple of windows and a door and we leave things clean and tidy. A visit to Greenhithe is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Mention any tricky access
- Move anything stored near the joints
- Tell us about any previous sealing or DIY attempts
Getting a quote
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or email us with the details.