West Sussex · England
Sand mastic for sash & case windows in Heyshott, West Sussex
Problem with your window and door surrounds in Heyshott? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Mastic dropping out of the joint
- Mastic round period door frames that has failed
- Modern sealant on a period surround
How we handle sand mastic in Heyshott
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it, so ask us before you decorate. We work on tenement windows, timber door frames and brick reveals, and common reasons people get in touch are weathered mastic on the most exposed windows and mastic round period door frames that has failed.
Mastic can only go onto a dry, clean joint, so window work in Heyshott is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
You’re covered for a year from the day we finish. If anything is not right with it, phone 0345 464 0079 or email us.
- Place
- Heyshott (GU29)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in Heyshott
Gaps round a sash window let in rain and draughts. Left, water can reach the timber and the wall so renewing it early protects the window. Where a wall is exposed, as many are in small places like Heyshott, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What you get with us
- Full insurance on every job
- Trusted Arbo and Everbuild sealants
- Rated 4.9 stars on Google
- Approved under the ARBOMaster scheme
See our cost guide and customer reviews.
Common questions in Heyshott
Is there a guarantee on sand mastic in Heyshott?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Do you cover smaller places like Heyshott?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Should I use sand mastic or silicone?
We will help you decide. Sand mastic suits many period homes and newer frames suit modern sealant.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
What does sand mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we will talk you through it.
Is it messy?
Not at all. The area is protected while we work and cleaned up afterwards.
I’m a tenant. Can you help?
Yes, though it’s best to check with your landlord first. Landlords are often happy for the work to be arranged.
Heyshott homes and the weather
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Cowdray House (about 2.5 miles north) are a reminder that the area around Heyshott 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’s traditional sand mastic.
Around Heyshott, as everywhere, sand mastic is only as good as the preparation behind it.
Heyshott is about 8 miles north of Chichester, in West Sussex. Jobs in Heyshott get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Across West Sussex, we cover 371 places, and Heyshott is one of them. You can also see our page for Portsmouth, about 19 miles away.
Postcode districts we cover here for sand mastic: GU29. We also cover Hoyle (1 mile north-east), Heyshott Green (1 mile north-west), Cocking (1 mile west), Cocking Causeway (2 miles north-west) and West Lavington (2 miles north). Within a short drive, we also cover Bognor Regis (11 miles south), Chichester (8 miles south), Selsey (15 miles south), Littlehampton (13 miles south-east), Emsworth (12 miles south-west) and Rustington (13 miles south-east).
Near you in Heyshott
In Heyshott, that means homes and buildings near Unicorn Inn, among other places. Well-known places in the area include Lodsworth Castle (2.8 miles north-east) and Midhurst Community Hospital (2.9 miles north). Green spaces nearby include Graffham Common and Levin Down.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Get any rot dealt with first
- Look over the window mastic once a year
- Find out about consent before window work on a listed home
- Sort the mastic before the decorators arrive
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Towns and villages near Heyshott
More services for Heyshott
DIY sealant or a professional job?
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.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What affects the quote in Heyshott
Call for a quick quote. The main things that affect it are:
- The number and length of the joints
- How many areas need sealing
- Mould in or behind the old joints
- When we can work, for business premises
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.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- Whether it’s a home or a business
- Where the property is
- Any access issues, like height or stairs
- The problem you’ve noticed
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we’ll come back to you with a quote.
Signs you need sand mastic in Heyshott
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows.
Keep an eye out for these signs:
- Wind and rain getting in round a sash window
- Cracked mastic round a front door frame
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic worn away on windows facing the weather
For an older house near a landmark such as The Parish Church of St James, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before you book
- How the joint is cleaned and prepared
- What happens if the job turns out different
- Which colour the sealant will be
- Whether VAT is included
What happens on the day
You don’t need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the work takes a few hours per window, depending on the condition of the joints for a typical job. In a small place like Heyshott, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Let us know about parking restrictions
- Clear items away from the joints we are working on
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
Want a quote for sand mastic? Please ring 0345 464 0079 or email us and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
Honest limits
New sealant can’t fix everything, and we’d rather say so up front. It won’t solve:
- Sashes that need overhauling
- Decisions on consent for listed homes
- Putty and glazing repairs
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Heyshott
- Tenement windows
- Stone surrounds
- Brick reveals
- Period & listed homes
- Timber door frames
- Sash and case windows