Hampshire · England
Sand mastic for sash & case windows in Heathfield, Hampshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Heathfield, backed by a one-year guarantee. Ask us for a quote.
- A silicone bead on a sash window that spoils the look
- Draughts and rain around sash boxes
- Mastic round period door frames that has failed
Sand mastic in Heathfield
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. We work on tenement windows, sash and case windows and stone surrounds, and common reasons people get in touch are cement or filler used on old window joints that has cracked and tired mastic found when preparing windows for paint.
Many houses in smaller places like Heathfield have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Heathfield (PO15, PO14)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Keeping the joints in good condition
So the new joints stay in good condition:
- Get any rot dealt with first
- Keep sills and gutters clear so water drains away
- Look over the window mastic once a year
- Keep modern sealant off the mastic
Don’t touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
Towns and villages near Heathfield
What else we do in Heathfield
What happens on the day
There’s no need to move everything out, only the area right around the joints. Everything nearby is protected, and the work takes anything from a few hours to a full day, depending on how many windows in most cases. Parking around Heathfield is generally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Clear items away from the joints we’re working on
- Tell us about any water getting in
- For business premises, tell us about site rules or sign-in
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved.
Advice
What sealant work can’t fix
A few problems are outside what sealant work can do:
- Masonry that needs repairing
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sashes that rattle, stick or will not open
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Joints and surfaces we work on
- Brick reveals
- Sash and case windows
- Tenement windows
- Timber door frames
- Stone surrounds
- Period & listed homes
How we quote for sand mastic
The price is agreed before any work begins. It’s based on:
- Any working-time requirements on site
- How many rooms, windows or areas are involved
- The size of the job
- The type of sealant required
Leaving a failed joint usually makes the job bigger, not smaller. If you’re not sure whether it needs doing, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
Asking for a quote
To help us quote quickly, please include:
- Where the job is, and your postcode
- Roughly how big the job is
- Any previous sealing or DIY work
- A few photos by email, if you can
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Surface by surface
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Questions from Heathfield
Do you cover smaller places like Heathfield?
Yes. Heathfield is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is sand mastic in a coastal place like Heathfield any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Is it possible to take out silicone and use sand mastic instead?
In most cases. We remove the silicone and clean the joint, then point it with sand mastic.
Do you offer different sealant colours?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.
What should I tell you?
A short description and the location, plus pictures if you have them. We will ask anything else we need to know.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Can tenants book the work?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Heathfield homes and the weather
Heathfield is within about 3 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Homes close to St Columba include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you look after a building such as Ranvilles Infant School, larger buildings have plenty of frames, and the mastic around each one ages.
Heathfield is about 1 mile west of Fareham, in Hampshire. We carry out sand mastic for homes and businesses in Heathfield. Heathfield is one of 683 towns and villages in Hampshire we cover. We also work in Portsmouth, around 7 miles away.
Postcode districts we cover here for sand mastic: PO15 and PO14. Whether your property is on Oak Road, Peak Lane and The Avenue or a nearby road, we can help. Nearby, we also carry out sand mastic in Catisfield (1 mile west), Titchfield (1 mile west), Funtley (1 mile north), Titchfield Park (2 miles north-west) and Little Posbrook (2 miles south-west). Larger places within reach include Winchester (15 miles north), Gosport (4 miles south-east), Havant (10 miles east), Eastleigh (10 miles north-west), Horndean (10 miles north-east) and Totton (14 miles west).
Landmarks near Heathfield
Around Heathfield, our work takes us to homes and buildings near Fishermans Arms and The Henry Cort Community College. Heathfield’s nearest station is Fareham station, about 0.9 miles east. Other landmarks nearby include Fareham Shopping Centre (1.6 miles east) and Carron Row Farm Museum (1 mile north-west). For a walk, there’s Portsdown Hill and Swanwick Lakes.
When to call us in Heathfield
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
Keep an eye out for these signs:
- Failed mastic on an exposed elevation
- Draughts and rain around sash boxes
- Gaps between timber frames and stone or brick
- Gaps round a timber door in stone or brick
For landlords with property near Fareham station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Questions to ask before you book
- How the joint is cleaned and prepared
- The length of the guarantee
- What insurance they hold
- How much experience the applicator has