West Sussex · England
Sand mastic for sash & case windows in Monk's Gate, West Sussex
Professional sand mastic in and around Monk's Gate, with every bit of old sealant taken out first and a 12-month guarantee.
- Gaps where the frame meets the masonry
- Patchy fillers round a sash window
- Mastic that needs renewing before redecorating
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Sashes that rattle, stick or will not open
- Putty and glazing repairs
- Crumbling stone or brickwork round the window
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly.
Surfaces we seal
- Period & listed homes
- Stone surrounds
- Sash and case windows
- Brick reveals
- Tenement windows
- Timber door frames
How we handle sand mastic in Monk's Gate
For a listed home or one in a conservation area, ask 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 stone surrounds, timber door frames and sash and case windows, and people most often call us about patchy fillers round a sash window and open joints round the window box.
Around Monk's Gate, 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.
- Location
- Monk's Gate (RH13)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Nearby places to Monk's Gate
Other services in Monk's Gate
What affects the cost of sand mastic
We quote each job individually. These are the things that affect it:
- The number and length of the joints
- How many areas need sealing
- The type of sealant required
- Mould in or behind the old joints
Combining jobs into one visit is usually more efficient than separate visits. We’ll give you a clear price for the lot.
Helping us quote
When you contact us, it’s useful to know:
- The address or postcode of the job
- Pictures of the joints, sent by email
- Whether it has been sealed before
- Access, such as stairs, a lift or height
For a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
Your questions about sand mastic in Monk's Gate
Is Monk's Gate in your area for sand mastic?
Yes, Monk's Gate is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
I let a flat near Horsham station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
Are you insured?
Yes. Mr Mastic is fully insured.
Can you seal over the old sealant?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we will agree access with you when we book.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
How long does sand mastic take?
That depends on how much there is to do, but as a guide it takes a few hours per window, depending on the condition of the joints. We will give you a better idea when we quote.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Monk's Gate.
How it works
A visit follows a simple pattern: we check the joints, protect the area around them, do the work and tidy away. Most jobs take anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Monk's Gate, 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 look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Preparing for the visit
- Tell us about any water getting in
- Let us know about parking restrictions
- Keep children and pets away from the work area
How to get a quote
Want a quote for sand mastic? Please call 0345 464 0079 or send us an email and tell us about the job. We will explain what we’d do and give you a clear price before we start.
Read more
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Why it’s worth doing now in Monk's Gate
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. In a small place like Monk's Gate, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why choose Mr Mastic in Monk's Gate
- Trusted Arbo and Everbuild sealants
- We leave the area clean and tidy
- More than 20 years in sealant work
- We’re fully insured
See our cost guide or what customers say.
Keeping the joints in good condition
Simple care keeps the joints in good condition. We recommend:
- Clear gutters so water doesn’t pour onto the windows
- Sort the mastic before the decorators arrive
- Don’t run silicone over sand mastic
- Avoid heavy scraping on the mastic joint
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Sound mastic protects the frame. Failed mastic lets water reach the timber, which can lead to rot.
Sand mastic in Monk's Gate: local notes
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.
If you let a flat or house near Horsham station, any sash windows need sound mastic to keep draughts and rain out. In the older streets around Church of the Good Shepherd, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Monk's Gate is about 3 miles south-east of Horsham, in West Sussex. Monk's Gate gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Monk's Gate is one of 371 places in West Sussex we cover for sand mastic. We also work in Crawley, around 7 miles away.
Every address in RH13 is covered for sand mastic, from the main roads to the quietest streets. We cover properties on Coolhurst Close, Nuthurst Road and Brighton Road. If you’re just outside Monk's Gate, we cover Mannings Heath (1 mile north), Lower Beeding (1 mile east), Crabtree (2 miles south-east), Plummers Plain (2 miles east) and Roffey (3 miles north). Within a short drive, we also cover Crawley (7 miles north-east), Horsham (3 miles north-west), Worthing (15 miles south), Haywards Heath (9 miles east), Burgess Hill (9 miles south-east) and East Grinstead (14 miles north-east).
Around Monk's Gate
We work in homes and buildings around The Dun Horse pub, Newells Preparatory School and The Forest School. The nearest railway station is Horsham station, about 2.6 miles north-west of the centre. A little further out are Christs Hospital School Museum (3.4 miles west) and Horsham Hospital (3 miles north-west). Green spaces nearby include Warnham LNR.
Do you need sand mastic in Monk's Gate?
Most of it is simply age. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
The problems people generally mention when they call are:
- Draughty sash windows at the surround
- Cement or filler used on old window joints that has cracked
- Mastic dropping out of the joint
- Cracked mastic round a front door frame
If you look after a building such as St Andrew's CofE Primary School, the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- How the joint is cleaned and prepared
- How the colour is chosen
- What happens if they find a problem under the old sealant
- What product goes in the joint