West Sussex · England
Window & door mastic in Hammerwood, West Sussex
Window mastic in Hammerwood from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- White mastic on grey or black frames
- Untidy mastic left by window fitters
- Rain getting in at the frame or under the sill
Should I try it myself first?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Window mastic for homes and businesses in Hammerwood
Most frames have an outside joint and an inside one. Outside, the mastic keeps rain out; inside, the joint between frame and plaster stops draughts and tidies the reveal. We seal one or both, depending on what’s needed. We work on patio & French doors, window sills and composite doors, and the jobs we see most are leaking joints at the ends of sills and white mastic on grey or black frames.
Around Hammerwood, 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.
You are covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or send us an email.
- Location
- Hammerwood (RH19)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Honest limits
Before you book, it’s worth knowing the limits too:
- Penetrating damp from a failed cavity tray or render
- Rotten timber, which needs a joiner first
- Draughts through the window seals rather than the frame
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Composite doors
- uPVC windows
- Patio & French doors
- Timber windows & doors
- Aluminium frames
- Window sills
Towns and villages near Hammerwood
Other services in Hammerwood
What affects the cost of window mastic
We don’t publish a price list, because no two jobs are the same. What we look at:
- The amount of work
- Whether old sealant or filler has to be cut out
- The number of rooms or windows
- Which sealant suits the joint
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we will go through it with you.
Helping us quote
What to tell us when you ask for a quote:
- The type of property
- Photos by email, if that is easy
- Where the property is
- How we’d reach the joints
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or send us an email.
Landlord and commercial work in Hammerwood
If you manage several properties in or around Hammerwood, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
Window mastic in Hammerwood: local notes
Historic houses like Hammerwood Park (about 0.8 miles south-east) are a reminder that the area around Hammerwood has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. 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.
Homes close to Church of St Stephen include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Letting a property close to Dormans station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. If you look after a building such as Sackville School, the mastic around its windows and doors needs looking after like any other building’s.
Hammerwood is about 3 miles east of East Grinstead, in West Sussex. Homes, rented property, offices and hotels in Hammerwood is covered for window mastic, old or new, large or small. The work is guaranteed for a year. Hammerwood is one of 371 places in West Sussex where we work for window mastic. You can also see our page for Crawley, roughly 10 miles from Hammerwood.
Here we cover the RH19 postcode area for window mastic. We also cover Ashurst Wood (2 miles south-west), Cowden (2 miles east), Dormansland (2 miles north-west), Dormans Park (2 miles west) and East Grinstead (3 miles west). Larger places within reach include Crawley (10 miles west), Haywards Heath (11 miles south-west), Burgess Hill (15 miles south-west), Broadfield (11 miles west), Bewbush (12 miles west) and Southgate (10 miles west).
What’s near Hammerwood
The closest station to Hammerwood is Dormans station, about 2.4 miles north-west. Nearby you’ll also find Bolebroke Castle (2.9 miles south-east) and East Grinstead Museum (2.4 miles south-west). The countryside around Hammerwood includes Hedgecourt Lake.
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Keep solvents and bleach off the sealant
- Air rooms to keep condensation down around windows
- Paint up to the joint, not over it
- Clean frames with a soft cloth and soapy water
Most silicone sealants will not take paint, so if you’re planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. Any of these is worth a call.
What the job involves on each surface
Window sills
Sills catch the water running down the glass, so the joints at each end and underneath matter. Each is cleaned out and resealed.
Composite doors
Front doors take the weather head on, and the top and bottom corners tend to fail first. Those corners get the most care.
Hammerwood questions
Do you work for landlords with property near Dormans station?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Do you cover smaller places like Hammerwood?
Yes. Hammerwood is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We will give you the cure time for the product we used before we leave.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
How long will my window job take?
Allow a morning for a couple of windows and a door. Access and the amount of old mastic make the biggest difference.
How do I get a quote for window mastic in Hammerwood?
We don’t publish prices, because the cost 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.
Do you work on first-floor windows?
Yes, in most cases. We plan safe access before the job.
What should I tell you?
The location, the problem and the rough size of the job. If you can, email a few pictures.
The process
All our tools and materials come with us in the van. Once we’ve agreed what’s being done, the area is protected and the work begins. Most jobs take a few hours for a handful of frames, longer for a whole house. Somewhere as small as Hammerwood, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Tell us about access, such as stairs, a lift or high-level joints
- Keep children and pets away from the work area
Ask for a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work before giving you a price.