West Sussex · England
Sand Mastic in The Haven
Professional sand mastic in and around The Haven, with every bit of old sealant taken out first and a 12-month guarantee.
- Modern sealant on a period surround
- Tired mastic found when preparing windows for paint
- Cracked mastic round a front door frame
Sand mastic in The Haven
For a listed home or one in a conservation area, ask your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. We work on period & listed homes, timber door frames and stone surrounds, and the jobs we see most are failed mastic on an exposed elevation and gaps between timber frames and stone or brick.
Mastic can only go onto a dry, clean joint, so window work in The Haven is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Whatever the size of the job, it’s backed by our 12-month guarantee in The Haven and across West Sussex.
- Place
- The Haven (RH14)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How it works
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes a few hours for a single window, longer for several. Somewhere like The Haven needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- 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 isn’t too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any water getting in
- Clear the area around the work
Getting a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
Read more
Sand mastic in The Haven: local notes
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.
Letting a property close to Billingshurst station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
The Haven is about 3 miles north of Billingshurst, in West Sussex. Our applicators cover sand mastic for homes and businesses in The Haven and nearby. The Haven is one of 371 places in West Sussex where we work. You can also see our page for Crawley, roughly 12 miles from The Haven.
Our applicators cover all of RH14 for sand mastic and the streets around it. Other places close to The Haven include Five Oaks (1 mile south-east), Bucks Green (2 miles north), Slinfold (2 miles east), Rudgwick (2 miles north) and Tisman's Common (2 miles north-west). Further out, we also cover Crawley (12 miles east), Horsham (5 miles east), Broadfield (11 miles east), Storrington (10 miles south), Billingshurst (3 miles south) and Bewbush (10 miles east).
What’s near The Haven
Around The Haven, our work takes us to homes and buildings near The Blue Ship Public House. The closest station to The Haven is Billingshurst station, about 3.4 miles south. Well-known places in the area include Horsham Hospital (5.3 miles east) and Christs Hospital School Museum (3.9 miles east).
Nearby places to The Haven
More services for The Haven
When it is not the sealant
It helps to know what we can’t do too:
- Whether work needs listed building consent
- Crumbling stone or brickwork round the window
- Sashes that rattle, stick or won’t open
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before booking.
Joints and surfaces we work on
- Sash and case windows
- Tenement windows
- Period & listed homes
- Brick reveals
- Stone surrounds
- Timber door frames
Surface by surface
Period and listed homes
Period homes look their best with traditional materials.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Common questions in The Haven
Can you do sand mastic in The Haven?
Yes, The Haven 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, and we’ll send you a clear quote.
Can you help a landlord with a rental near Billingshurst station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before any work starts.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints.
What do you need from me for a quote?
A short description and the location, with pictures by email if possible. If we need more, we’ll ask.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
What is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
How long does sand mastic take to harden?
It forms a skin fairly soon and it hardens fully over a longer time. The weather and joint depth both affect it.
How we quote for sand mastic
We don’t publish a price list. What we look at:
- How much old sealant there is and how hard it is to remove
- How many areas need sealing
- When we can work, for business premises
- Access and height
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will go through it with you.
What to tell us for a quote
To make quoting easier, let us know:
- How many joints, rooms or windows are involved
- Photos by email, if that’s easy
- The type of property
- What the problem is, such as mould, gaps, leaks or cracking
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we will talk you through the work and give you a clear quote.
Do you need sand mastic in The Haven?
Age is the main cause. Even well-laid mastic needs renewing in time and how long it lasts depends on the weather it faces.
Keep an eye out for any of the following:
- Wind and rain getting in round a sash window
- A silicone bead on a sash window that spoils the look
- Open joints round the window box
- Old sand mastic that has cracked, crumbled or fallen out
Around The Haven, as everywhere, sand mastic is only as good as the preparation behind it.
What your quote should include
- What product goes in the joint
- How the joint is cleaned and prepared
- Is the old sealant removed completely?
- Which colour the sealant will be
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
A careful DIYer can reseal a simple joint, 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.
Leave it or put it right?
New mastic over crumbling mastic will not hold. We remove the loose material first so the new mastic stays put. Where a wall is exposed, as many are in small places like The Haven, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why choose Mr Mastic in The Haven
- Full insurance on every job
- ARBOMaster approved applicator
- Neat joints and a tidy finish
- Every job guaranteed for a year
See what affects the cost and customer reviews.