West Sussex · England
Sand Mastic in Cowfold
We cover Cowfold for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Failed mastic on an exposed elevation
- Modern sealant on a period surround
- Cracked mastic round a front door frame
What affects the cost of sand mastic
There’s no set price list. What we look at:
- Mould in or behind the old joints
- The amount of work
- How many areas need sealing
- Access and height
Combining jobs into one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
What we need to know
When you contact us, these details help:
- How we’d reach the joints
- How many joints, rooms or windows are involved
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work.
About our sand mastic in Cowfold
We renew sand mastic around sash windows and doors in stone and brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. If you’re dealing with mastic worn away on windows facing the weather and gaps where the frame meets the masonry, we can put it right, whatever the surface.
Outdoor sealant needs dry, clean surfaces, so work on frames around Cowfold is planned for dry weather. 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 isn’t right with it, call 0345 464 0079 or send us an email.
- Place
- Cowfold (RH13)
- Region
- West Sussex
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Also near Cowfold
Also in Cowfold
DIY sealant or a professional job?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
What we do, step by step
You don’t need to clear the whole room or building before we come, just the space around the work. Everything nearby is protected, and the job takes a few hours for a single window, longer for several in most cases. For a village or hamlet like Cowfold, 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 each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- Clear items away from the joints we’re working on
- Tell us about any previous sealing or DIY attempts
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.
Advice
Honest limits
We’ll always be straight with you, so here’s what new sealant won’t do:
- Crumbling stone or brickwork round the window
- Sashes that rattle, stick or won’t open
- Decisions on consent for listed homes
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Surfaces we seal
- Tenement windows
- Period & listed homes
- Sash and case windows
- Stone surrounds
- Timber door frames
- Brick reveals
Signs you need sand mastic in Cowfold
Most of it is simply age. Sand mastic is a maintenance item like any pointing, depending on exposure and upkeep.
Common reasons people contact us are:
- Open joints round the window box
- Gaps round a timber door in stone or brick
- Cement or filler used on old window joints that has cracked
- Mastic dropping out of the joint
Managing a site like St Peter's CofE (Aided) Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- Whether they’re fully insured
- What product goes in the joint
- Whether VAT is included
- How long the guarantee is
What the job involves on each surface
Timber door frames
Doors face weather and wear, so their mastic can fail sooner. We rake it out and renew it.
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
What happens if it’s left?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad and new mastic seals them. Around Cowfold, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why book with us
- Arbo and Everbuild products
- ARBOMaster approved applicator
- Rated 4.9 stars on Google
- Anti-fungal sanitary silicone in wet areas
Take a look at our cost guide and customer reviews.
Common questions in Cowfold
Is sand mastic in Cowfold guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Do you cover smaller places like Cowfold?
Yes, Cowfold is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
What does sand mastic cost?
Every job is different, so each one gets its own quote. To get one, phone 0345 464 0079 or drop us an email and let us know what needs doing and where.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Cowfold and the rest of West Sussex.
What’s sand mastic made of?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Do I need permission for sand mastic on a listed building?
Check with your local planning authority. They decide whether consent is needed.
Cowfold homes and the weather
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as Church of St Peter, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Cowfold is about 6 miles south of Horsham, in West Sussex. If you need sand mastic in Cowfold, please phone 0345 464 0079 or send us an email for a quick quote. We cover West Sussex from our Crawley base. Our West Sussex coverage runs to 371 places, Cowfold among them. Crawley is on our list too, about 9 miles from Cowfold.
We work across RH13 for sand mastic. You will find streets such as Oakfield Road, Acorn Avenue and Holm Oaks, all of which we cover. Nearby, we also carry out sand mastic in Kent Street (1 mile south-east), Wineham (2 miles south-east), Shermanbury (2 miles south), Crosspost (3 miles east) and Twineham Green (3 miles south-east). Larger places within reach include Crawley (9 miles north-east), Horsham (6 miles north), Worthing (13 miles south-west), Haywards Heath (8 miles east), Burgess Hill (7 miles east) and East Grinstead (15 miles north-east).
Near you in Cowfold
Nearby you’ll also find The Dene Hospital (4.9 miles east). Open spaces near Cowfold include Knepp Wildland.