Hampshire · England
Crowdhill Sand Mastic
Sand mastic in Crowdhill from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Silicone on a period window that looks wrong
- Draughty sash windows at the surround
- Patchy fillers round a sash window
Sand mastic in Crowdhill
A silicone bead around a sash window can look out of place and does not suit the building. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. We work on period & listed homes, brick reveals and stone surrounds, and people most often call us about mastic dropping out of the joint and window mastic to renew ahead of painting.
Around Crowdhill, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
You get a 12-month guarantee, the same in Crowdhill as everywhere else we work.
- Where
- Crowdhill (SO50)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
FAQs for Crowdhill
Can you help a landlord with a rental near Eastleigh station?
Yes. We work for landlords and letting agents as well as householders. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Can you do sand mastic in Crowdhill?
Yes, Crowdhill is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and let us know what needs doing, and we will send you a clear quote.
Should I try DIY first?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
How do I get a quote for sand mastic in Crowdhill?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
How long will you be here?
As a guide, most jobs take anything from a few hours to a full day, depending on how many windows. Bigger jobs take longer.
How long does sand mastic take to harden?
The surface skins quite quickly, then hardens over a longer period. Timing depends on the weather and the joint.
Is it possible to paint over sand mastic?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
What happens if it’s left?
If you’re redecorating, renew the mastic first. Paint over cracked mastic will not stop the gaps, and the new mastic is traditionally left unpainted. Where a wall is exposed, as many are in small places like Crowdhill, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are not sure whether it needs doing, call 0345 464 0079 or email us and we will give you an honest view and a quote.
Why book with us
- Anti-fungal sanitary silicone in wet areas
- Approved under the ARBOMaster scheme
- 4.9 on Google from 180+ five-star reviews
- Neat joints and a tidy finish
See our cost guide or customer reviews.
Surface by surface
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. The gap round it is pointed with sand mastic.
Brick reveals
We rake out the old mastic and pack deep voids before pointing.
Landlord and commercial work in Crowdhill
We work for landlords and agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Nearby places to Crowdhill
Also in Crowdhill
What sealant work cannot fix
Before you book, it’s worth knowing the limits too:
- Planning or listed building consent (your local planning authority decides)
- Decayed frames that need repair
- Cracked or broken glass
If you’re not sure, just call 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Timber door frames
- Period & listed homes
- Sash and case windows
- Stone surrounds
- Tenement windows
- Brick reveals
Crowdhill homes and the weather
Historic houses like South Stoneham House (about 4.4 miles south-west) are a reminder that the area around Crowdhill has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
Letting a property close to Eastleigh station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. If you look after a building such as Wyvern Technology College, its window and door frames need their mastic kept sound, just like a home’s. In the older streets around Church of the Holy Trinity, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Crowdhill is about 2 miles north-east of Eastleigh, in Hampshire. Homes, rented property, offices and hotels in Crowdhill can book us for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. Across Hampshire, we cover 683 places, Crowdhill among them. You can also see our page for Southampton, about 6 miles away.
Jobs for sand mastic in SO50 is quoted and booked the same way as anywhere else. If you need sand mastic at a property on Chestnut Drive and Winchester Road or anywhere close by, our applicators can take on the job. If you are just outside Crowdhill, we cover Fisher's Pond (1 mile north), Nob's Crook (1 mile north-west), Colden Common (1 mile north-west), Lord's Wood (1 mile north-west) and Bishopstoke (1 mile south-west). Further out, we also cover Winchester (6 miles north), Gosport (14 miles south-east), Fareham (10 miles south-east), Horndean (14 miles east), Totton (10 miles south-west) and Chandler's Ford (4 miles west).
Near you in Crowdhill
Typical jobs here are in homes near The King's School Senior and The Fox & Hounds pub and the streets around them. For rail, the closest station is Eastleigh station, roughly 2.2 miles west. Other landmarks nearby include Eastleigh Museum (2.3 miles west) and Moorgreen Hospital (3.6 miles south). Green spaces nearby include Twyford Down and Shawford Down.
How to look after the new joints
After the cure time, these simple habits help:
- Plan mastic work ahead of painting
- Ask us before painting near the mastic
- Make sure water runs off the sill
- Check the mastic when you check the paintwork
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
The process
We keep the work tidy and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take anything from a few hours to a full day, depending on how many windows. Somewhere like Crowdhill needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- Each surround is checked first.
- 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.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any previous sealing or DIY attempts
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and give you a clear price before any work starts.