West Sussex · England
Hammerwood Sand Mastic
Problem with your window and door surrounds in Hammerwood? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Gaps between timber frames and stone or brick
- Window mastic to renew ahead of painting
- Wind and rain getting in round a sash window
Why it’s worth doing now in Hammerwood
New sash windows are a major, costly change and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Around Hammerwood, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Hammerwood
- Trusted Arbo and Everbuild sealants
- Domestic, commercial and hotel work
- Full insurance on every job
- Every job guaranteed for a year
Sand mastic in Hammerwood, done properly
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 tenement windows, timber door frames and stone surrounds, and the jobs we see most are window mastic to renew ahead of painting and draughty sash windows at the surround.
Homes in small places like Hammerwood often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
You get a one-year guarantee, the same in Hammerwood as everywhere else we work.
- Location
- Hammerwood (RH19)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Hammerwood
What else we do in Hammerwood
Common questions in Hammerwood
Is Hammerwood in your area for sand mastic?
Yes. Our work covers London and the South East, and Hammerwood is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
Can you help a landlord with a rental near Dormans station?
Yes. We work for landlords and letting agents as well as householders. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
When will the new mastic be hard?
A skin forms quite soon, but full hardening takes longer. We’ll explain what to expect before we leave.
What’s sand mastic made of?
It’s sand mixed with a linseed-oil-based binder, used between timber frames and stone or brick.
What information do you need?
Let us know what needs doing and where, plus pictures if you have them. We’ll ask anything else we need to know.
What does sand mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Do you have insurance?
Yes. Full insurance covers our work.
Different surfaces, different methods
Brick reveals
Sand mastic is also used where timber frames meet brick. It suits older brickwork.
Tenement and terrace windows
Where a building is shared, window work may involve neighbours so it’s worth checking responsibilities.
Landlords, agents and businesses in Hammerwood
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Housing providers, facilities teams and property managers book us too in Hammerwood and across West Sussex. Several sites can go on one quote.
How we quote for sand mastic
We quote each job individually. These are the things that affect it:
- Working hours on commercial sites
- The number of rooms or windows
- Mould in or behind the old joints
- How much there is to do
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and agree the price before starting.
Asking for a quote
When you contact us, these details help:
- Roughly how big the job is
- Any previous sealing or DIY work
- Pictures of the joints, sent by email
- What the problem is, such as mould, gaps, leaks or cracking
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you’re ready, phone 0345 464 0079 or send us an email.
Frames and glazing around Hammerwood
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 is traditional sand mastic. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Letting a property close to Dormans station? Then any sash windows need sound mastic to keep draughts and rain out. Homes close to Church of St Stephen include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. For site and facilities teams at buildings such as Sackville School, its window and door frames need their mastic kept sound, just like a home’s.
Hammerwood is about 3 miles east of East Grinstead, in West Sussex. For sand mastic in and around Hammerwood, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We cover West Sussex from our Crawley base, Hammerwood included. Our West Sussex coverage runs to 371 places, Hammerwood among them. You can also see our page for Crawley, about 10 miles away.
We cover every part of RH19 for sand mastic. Close by, we work in 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). Within a short drive, we also cover 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 nearest railway station is Dormans station, roughly 2.4 miles north-west of the centre. Well-known places in the area include Bolebroke Castle (2.9 miles south-east) and East Grinstead Museum (2.4 miles south-west). For a walk, there’s Hedgecourt Lake.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Sash cords, weights and draught-proofing of the sashes
- Decayed frames that need repair
- Crumbling stone or brickwork round the window
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer before booking.
What we seal
- Period & listed homes
- Sash and case windows
- Brick reveals
- Tenement windows
- Stone surrounds
- Timber door frames
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Leave the new mastic unpainted
- Take care around the mastic when scraping paint
- Ask a joiner to look at soft timber first
- Inspect the joints round the windows every year or so
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
How the visit works
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take a few hours per window, depending on the condition of the joints. For a village or hamlet like Hammerwood, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check the window surrounds and agree which joints need renewing.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Mention any tricky access
- Mention if the joints have been sealed before
Getting a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.