Hampshire · England
Window & door mastic in Sprat's Down, Hampshire
Our applicators work in Sprat's Down on mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly.
- White mastic on grey or black frames
- Mastic that is falling out in pieces
- Untidy mastic left by window fitters
About our window mastic in Sprat's Down
Homes in Sprat's Down have every kind of window: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. If you are dealing with cracked internal joints between frame and plaster and black, perished sealant on frames, we can put it right, whatever the surface.
Homes in small places like Sprat's Down often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
Every job comes with a 12-month guarantee, wherever you are in Hampshire.
- Place
- Sprat's Down (SO45)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in Sprat's Down
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Windows and doors in Sprat's Down
Sprat's Down is close to 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 window and door frames, which can dry out and crack sooner where a building faces the weather. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you look after a building such as Fawley Infant School, its window and door frames need their mastic kept sound, just like a home’s. If you live in an older home near St George, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Rented homes near Hamble station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Sprat's Down is about 4 miles north of Cowes, in Hampshire. Homes, rented property, offices and hotels in Sprat's Down can book us for window mastic, old or new, large or small. The work is guaranteed for a year. Sprat's Down is one of 683 towns and villages in Hampshire we cover for window mastic. Southampton is on our list too, around 8 miles away.
Work in SO45 works the same way as everywhere else we cover. We also cover the places around Sprat's Down: Calshot (1 mile east), Stonehills (1 mile north), Stanswood (1 mile south), Hillhead (1 mile east) and Ashlett (1 mile north). We also work in nearby towns such as Gosport (8 miles east), Eastleigh (11 miles north), Fareham (7 miles north-east), Totton (10 miles north-west), Chandler's Ford (12 miles north) and Hedge End (7 miles north).
Landmarks near Sprat's Down
Typical jobs here are in homes near Falcon Hotel and the streets around them. The nearest railway station is Hamble station, about 4 miles north. A little further out are Calshot Castle (1.6 miles east) and Sir Max Aitken Museum (3.9 miles south-east). Open spaces near Sprat's Down include Mercury Marshes and Mill Hill.
Leave it or put it right?
Failed mastic is not a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that is needed. Problems with the glass or gaskets are for a window company, and we’ll say so. In a small place like Sprat's Down, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Why choose Mr Mastic in Sprat's Down
- An ARBOMaster approved applicator
- A 12-month guarantee on all work
- Anti-fungal sanitary silicone in wet areas
- 20+ years of sealant experience
Read what affects the cost and our reviews.
How we quote for window mastic
Every job gets its own quote. These are the things that affect it:
- The product the joint needs
- Access and height
- How much old sealant there is and how hard it is to remove
- The size of the job
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- Where the property is
- The problem you’ve noticed
- If someone has resealed it before
- The rough size of the job
For a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
Common questions in Sprat's Down
Is Sprat's Down within the area you cover?
Yes. Sprat's Down 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.
Can you help a landlord with a rental near Hamble station?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we will send you a clear quote.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Do you seal inside as well as outside?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We do one or both.
Can you do upstairs windows?
Yes, if safe access is possible. Higher or awkward frames may need extra access, and we will confirm what’s needed.
Can I paint over the new sealant?
Not usually, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
How long should I leave it?
Cure times vary by product and the conditions. Before we leave, we’ll tell you the cure time.
How the job changes by surface
Patio & French doors
Water at the foot of a door frame is not always the mastic: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We check before we reseal.
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Make sure the drainage slots aren’t blocked
- Paint up to the joint, not over it
- Check the mastic once a year
- Avoid harsh chemicals near the mastic
Check the drainage slots in the frames are not blocked, so water can run away instead of sitting against the joint.
Signs to watch for: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. If you notice one, it’s time to get the joint looked at.
Also in Sprat's Down
When it is not the sealant
It helps to know what we cannot do:
- Condensation trapped between the panes
- Broken hinges, locks or handles
- Penetrating damp from a failed cavity tray or render
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
Surfaces we seal
- Window sills
- Aluminium frames
- Patio & French doors
- Timber windows & doors
- Composite doors
- uPVC windows
What happens on the day
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and clear up. It normally takes most of a day for a typical house, less for a few frames. Somewhere as small as Sprat's Down, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
How to prepare
- Clear the area around the work
- Try not to wet indoor joints just before the visit
- Mention any parking rules near the property
Get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or send us an email.