West Sussex · England
Sand mastic for sash & case windows in Brook Street, West Sussex
Sand mastic for Brook Street, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weathered mastic on the most exposed windows
- A silicone bead on a sash window that spoils the look
- Gaps between timber frames and stone or brick
Sand mastic in Brook Street, done properly
Silicone on a period window often looks wrong and does not suit the building. Sand mastic is the traditional choice, and we can replace one with the other. We work on sash and case windows, stone surrounds and brick reveals, and the jobs we see most are mastic worn away on windows facing the weather and draughts and rain around sash boxes.
In a village or hamlet like Brook Street, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Brook Street (RH17)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we are fully insured.
Common problems we fix in Brook Street
Timber frames move with the seasons. That movement opens up the mastic joint little by little.
Common reasons people contact us include:
- Gaps where the frame meets the masonry
- Crumbling sand mastic round a window
- Gaps round a timber door in stone or brick
- Modern sealant on a period surround
Schools such as Holy Trinity Church of England Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before you book
- How long the guarantee is
- Which colour the sealant will be
- What the cure time is
- Who does the work, and how experienced they are
The process
We keep the work tidy and contained to the joints we are treating, so you can get on with your day. The job usually takes anything from a few hours to a full day, depending on how many windows, and we explain the cure time before we leave. Somewhere as small as Brook Street, access is often the only tricky part. 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.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- 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.
Before we arrive
- Clear the area around the work
- Let us know about earlier repairs to the joints
- Keep children and pets away from the work area
How to get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Advice
How the job changes by surface
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.
How we quote for sand mastic
You will get a clear quote before work begins. It takes into account:
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
- Any mould that needs treating
- The number of rooms or windows
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
What to tell us for a quote
To make quoting easier, let us know:
- Whether it’s a home or a business
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
- Any access issues, like height or stairs
Getting a quote is simple: tell us what needs doing and where and its rough size. A few photos by email make the job easier to understand, and we will come back to you with a quote.
Also near Brook Street
Other services in Brook Street
Common questions in Brook Street
Can you do sand mastic in Brook Street?
Yes. Our work covers London and the South East, and Brook Street is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we will send you a clear quote.
Is Brook Street within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
What’s sand mastic made of?
It’s sand mixed with a linseed-oil-based binder for the joint between timber frames and masonry.
Can you match the sealant colour?
Generally, yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before we start.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Can sand mastic be painted?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Is the work guaranteed?
Every job comes with our 12-month guarantee, and we are fully insured.
How long does sand mastic take?
It depends on the size of the job, but most jobs take anything from a few hours to a full day, depending on how many windows. We will give you a better idea when we quote.
How to look after the new joints
Simple care keeps the joints in good condition. Our advice:
- Take care around the mastic when scraping paint
- Keep sills and gutters clear so water drains away
- Ask us before painting near the mastic
- Renew mastic before redecorating the windows
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Brook Street homes and the weather
With historic houses such as Ockenden Manor (about 1.3 miles south) nearby, there’s older building stock in the area around Brook Street as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Ockenden Manor, about 1.3 miles south, is one of the historic houses in the wider area around Brook Street. If you let a flat or house near Haywards Heath station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Brook Street is about 3 miles north-west of Haywards Heath, in West Sussex. From the centre of Brook Street to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Brook Street is one of 371 towns and villages in West Sussex where we work. Our Crawley page covers work nearby (6 miles or so).
We cover every part of the RH17 postcode area for sand mastic and the streets around it. Neighbouring places we cover for sand mastic include Whitemans Green (1 mile south), Cuckfield (1 mile south), Slough Green (1 mile west), Staplefield (2 miles north-west) and Balcombe (2 miles north). Within a short drive, we also cover Crawley (6 miles north), Horsham (8 miles west), Haywards Heath (3 miles south-east), Burgess Hill (5 miles south), East Grinstead (9 miles north-east) and Shoreham-by-Sea (14 miles south-west).
Local landmarks in Brook Street
Around Brook Street, our work takes us to homes and buildings near Warden Park School and Warden Park School. Brook Street’s nearest station is Haywards Heath station, about 2 miles south-east of the centre. A little further out are Cuckfield Museum (1.2 miles south) and Waterbury Castle (4.6 miles east). Green spaces nearby include Blunts Wood and Paiges Meadow.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.