West Sussex · England
Midhurst Sand Mastic
Window and door surrounds in Midhurst need attention? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Old sand mastic that has cracked, crumbled or fallen out
- A silicone bead on a sash window that spoils the look
- Gaps between timber frames and stone or brick
How we handle sand mastic in Midhurst
Sand mastic doesn’t last for ever, leaving gaps round the window. Renewing it closes the gap so the surround looks right again. We work on sash and case windows, brick reveals and timber door frames, and people most often call us about silicone on a period window that looks wrong and mastic round period door frames that has failed.
Many houses in smaller places like Midhurst have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows.
There’s a 12-month guarantee on every job, large or small.
- Place
- Midhurst (GU29)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What happens on the day
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes a few hours for a single window, longer for several, depending on how much there is to do. A visit to Midhurst is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- 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.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any parking rules near the property
- Clear the area around the work
How to get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. Whenever you’re ready, phone 0345 464 0079 or email us.
Read more
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Get any rot dealt with first
- Make sure water runs off the sill
- Take care around the mastic when scraping paint
- Check with your local planning authority if your home is listed
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
Why act early in Midhurst
Filling over old, loose mastic does not last. We remove the loose material first so the new mastic stays put. Homes in smaller places like Midhurst can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or email us for an honest opinion and a quote.
Why us?
- Quality sealants from Arbo and Everbuild
- Anti-fungal silicone where joints get wet
- Any old sealant cut out fully, not covered over
- Tidy, careful work
Read what affects the cost or customer reviews.
Midhurst: your questions answered
Is sand mastic in Midhurst guaranteed?
All our work, in Midhurst and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Can you do sand mastic in Midhurst?
Yes. We work across London and the South East, and Midhurst is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.
How long does sand mastic take?
That depends on the amount of work, but as a guide it takes a few hours for a single window, longer for several. We will tell you when we quote.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
What do you put in the joint?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Can old silicone round a sash window be swapped for sand mastic?
In most cases. The silicone is cut out and the joint cleaned before the sand mastic goes in.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures.
Where is Mr Mastic based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Landlords, agents and businesses in Midhurst
For anyone letting property in or around Midhurst, several properties can go on one quote. Send us the addresses and the work at each.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
DIY sealant or a professional job?
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, then guaranteed for a year.
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.
Midhurst homes and the weather
Historic houses like Cowdray House (about 0.6 miles north-east) are a reminder that the area around Midhurst has older buildings as well as new. In older buildings, 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like Midhurst CofE Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Midhurst is about 8 miles east of Petersfield, in West Sussex. Homes, rented property, offices and hotels in Midhurst is covered for sand mastic. Every job comes with our one-year guarantee. Our West Sussex coverage runs to 371 places, Midhurst among them. We also work in Portsmouth, around 19 miles away.
We work across the GU29 postcode area for sand mastic and the streets around it. Local streets include Station Road, Edinburgh Square and Pretoria Avenue. You will find Midhurst on the A272 and A286, so it’s easy for us to get to. Neighbouring places we cover for sand mastic include Bepton Common (1 mile south-west), West Lavington (1 mile east), Cocking Causeway (1 mile south), Easebourne (1 mile north-east) and Woolbeding (1 mile north-west). Larger places within reach include Bognor Regis (14 miles south), Chichester (10 miles south), Littlehampton (15 miles south-east), Emsworth (12 miles south-west), Storrington (14 miles east) and Billingshurst (13 miles east).
Landmarks near Midhurst
Locally, jobs take us to homes and businesses close to The Egmont Public House, Midhurst Rother College and St Margaret's Convent and the streets around them. Nearby you will also find Midhurst Community Hospital (0.8 miles north-east) and Lodsworth Castle (3.2 miles east). Green spaces nearby include Levin Down and Iping and Stedham Commons.
Other services in Midhurst
When it isn’t the sealant
It helps to know what we can’t do:
- Broken panes
- Sash cords, weights and draught-proofing of the sashes
- Decayed frames that need repair
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Where we work in Midhurst
- Brick reveals
- Tenement windows
- Timber door frames
- Stone surrounds
- Period & listed homes
- Sash and case windows
Do you need sand mastic in Midhurst?
Rain on the window surround works into any crack and loosens it further. Exposed elevations normally fail first.
Most people get in touch when they notice something like this:
- Mastic round period door frames that has failed
- Mastic worn away on windows facing the weather
- Gaps where the frame meets the masonry
- Modern sealant on a period surround
Homes close to Roman Catholic Church of Divine Motherhood include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in.
What your quote should include
- How hidden problems are handled
- The length of the guarantee
- Which colour the sealant will be
- What the quote includes, VAT included or not