Hampshire · England
Sand Mastic in Havant
Our applicators work in Havant on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- Old sand mastic that has cracked, crumbled or fallen out
- Draughts and rain around sash boxes
- Modern sealant on a period surround
Sand mastic in Havant
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. Common call-outs are for draughts and rain around sash boxes and mastic round period door frames that has failed, on brick reveals, stone surrounds and period & listed homes.
Around Havant, many houses have gained conservatories, French doors or replacement windows over time. Every addition brings more joints, each wearing at its own pace. Sills, frame heads and glazing joints are where leaks normally start.
A 12-month guarantee comes as standard, so you are covered after we have gone.
- Where
- Havant (PO9, PO11, PO7)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Should I try it myself first?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Quotes for sand mastic in Havant
Jobs vary more than people expect. What affects the quote:
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- When we can work, for business premises
- The product the joint needs
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Ask us for a quote and we will explain what it covers.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
Getting a quote is simple: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we will take it from there.
Questions from Havant
Does the coastal weather in Havant affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you cover Havant for sand mastic?
Yes, Havant is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Is it messy?
Very little: the area around the joints is protected first, and we tidy up before we go.
Can I paint the new mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Can I choose the sealant colour?
We help you choose a colour that suits, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Can you quote for more than one area?
Yes, we can. More than one area can go on one quote.
What does sand mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Why act early in Havant
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic will not stop the gaps, and the new mastic is traditionally left unpainted. Draughts from a gap round a frame, damp under a sill or water behind a bath panel all start small, and they’re far easier to fix early.
Combining jobs into one visit is normally more efficient than separate visits. We’ll give you a clear quote for the lot.
Why choose Mr Mastic in Havant
- Full insurance on every job
- Neat joints and a tidy finish
- More than 20 years in sealant work
- We never seal over old sealant
More services for Havant
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Renew mastic before redecorating the windows
- Do not run silicone over sand mastic
- Inspect the joints round the windows every year or so
- Avoid heavy scraping on the mastic joint
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
How the visit works
We bring everything the job needs with us, so you do not need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. It normally takes a few hours for a single window, longer for several. Parking in a town like Havant is normally straightforward, but tell us if there’s a driveway or any restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- 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 is not too thick.
- 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
- For business premises, tell us about site rules or sign-in
- Clear items away from the joints we’re working on
- Let us know about stairs, lifts or work at height
Get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Read more
Frames and glazing around Havant
Havant is within about 2 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. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around St Francis, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Schools such as Trosnant Infant School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Havant station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Havant is about 18 miles east of Southampton, in Hampshire. For sand mastic in and around Havant, please ring 0345 464 0079 or drop us an email for a quick quote. We cover Hampshire from our Crawley base, Havant included. Across Hampshire, we cover 683 places, Havant among them.
Every address in PO9, PO11 and PO7 is covered for sand mastic, from the main roads to the quietest streets. Whether your property is on Colemore Square, Market Parade and Juniper Square or anywhere close by, we can help. Havant is on the A27 and A3(M), which makes it straightforward to reach with everything needed for sand mastic. Nearby, we also carry out sand mastic in Leigh Park (1 mile north), Denvilles (1 mile south-east), Durrants (2 miles north-east), Langstone (2 miles south) and Warblington (2 miles south-east). Further out, we also cover Gosport (8 miles south-west), Fareham (9 miles west), Horndean (3 miles north), Hedge End (14 miles west), Petersfield (10 miles north) and Locks Heath (12 miles west). Being one of Hampshire’s larger places, Havant has every kind of property, from flats to offices.
Landmarks near Havant
Around Havant, our work takes us to homes and buildings near The Perseverance pub, St Albans Church and Havant College, among other places. The closest station to Havant is Havant station, about 0.6 miles south. Nearby you will also find Havant War Memorial Hospital (0.6 miles south) and Havant Museum (0.9 miles south-east). Green spaces nearby include Southmoor Nature Reserve.
When something else is needed
We’ll always be straight with you, so here’s what sealant can’t fix:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sash cords, weights and draught-proofing of the sashes
- Whether work needs listed building consent
If you are not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
Where we work in Havant
- Timber door frames
- Period & listed homes
- Sash and case windows
- Stone surrounds
- Brick reveals
- Tenement windows
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
We work for letting agents and landlords as well as householders. Sealant work between tenants is a simple way to keep a property in good order.