Hampshire · England
Sand mastic for sash & case windows in Blackmoor, Hampshire
Specialist sand mastic for Blackmoor: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Old cement repairs round a window that have failed
- Open joints round the window box
- A silicone bead on a sash window that spoils the look
Sand mastic in Blackmoor
Across Blackmoor, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand, finished to suit the masonry. If you have a silicone bead on a sash window that spoils the look and window mastic to renew ahead of painting, we can put it right.
In a village or hamlet like Blackmoor, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
We stand behind the work with a one-year guarantee.
- Where
- Blackmoor (GU33)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
The process
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes a few hours for a single window, longer for several, including the tidy-up. Somewhere like Blackmoor needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Clear the area around the work
- On commercial sites, let us know about site rules
- Tell us if parking is tricky
Ask for a quote
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we will explain what’s involved before giving you a price.
Related advice
Windows and doors in Blackmoor
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.
If you let a flat or house near Liss station, older sash windows in a rental need their mastic kept sound to keep the weather out. For an older house near a landmark such as St Matthew's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Blackmoor is about 5 miles south-east of Alton, in Hampshire. From the centre of Blackmoor to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across Hampshire, we cover 683 places, and Blackmoor is one of them. For nearby work, see our Portsmouth page, about 21 miles away.
Our applicators cover all of GU33 for sand mastic and the streets around it. Streets in the area include Blackmoor Road and Sotherington Lane, and we cover them all. Neighbouring places we cover for sand mastic include Woolmer (1 mile south-east), Greatham (1 mile south), Longmoor (2 miles south-east), Passfield (2 miles east) and Weavers Down (3 miles south-east). Further out, we also cover Basingstoke (15 miles north-west), Farnborough (15 miles north), Fleet (13 miles north), Horndean (14 miles south-west), Aldershot (12 miles north-east) and Alton (5 miles north-west).
Near you in Blackmoor
In Blackmoor, that means homes and buildings near Mill Chase Academy, among other places. For rail, the closest station is Liss station, about 3.5 miles south. Well-known places in the area include The Romany Museum (2.3 miles west) and Chase Community Hospital (1.4 miles north-east). For a walk, there’s Selborne Hill and Deadwater Valley.
What we’re called out for in Blackmoor
Previous repairs in cement or silicone often trap water or crack away. They do not move with the timber and we normally remove them.
People usually contact us when they notice one of these:
- Window mastic to renew ahead of painting
- Draughts and rain around sash boxes
- Open joints round the window box
- Silicone on a period window that looks wrong
For site and facilities teams at buildings such as St Matthew's Church of England Aided Primary School, the mastic around its windows and doors needs looking after like any other building’s.
What to look for in a quote
- The length of the guarantee
- Which sealant they’ll use, and why
- Which colour the sealant will be
- How much experience the applicator has
What the job involves on each surface
Period and listed homes
On a listed home or in a conservation area, the right material matters. Like-for-like sand mastic is normally favoured.
Sash and case windows
Sash windows are where we do most sand mastic work. Each joint round the box is raked out and renewed.
Honest limits
Sealant is not the answer to every problem, and we will tell you before we start. It won’t solve:
- Decisions on consent for listed homes
- Damaged stone surrounds
- Putty and glazing repairs
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Brick reveals
- Stone surrounds
- Period & listed homes
- Sash and case windows
- Tenement windows
- Timber door frames
Can I do it myself?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Also in Blackmoor
Keeping the joints in good condition
A little care helps the new joints last. Our advice:
- Look over the window mastic once a year
- Sort the mastic before the decorators arrive
- Make sure water runs off the sill
- Avoid patching sand mastic with silicone
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
Leave it or put it right?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic will not stop the gaps and traditional guidance is to leave the new mastic unpainted. In a small place like Blackmoor, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Combining jobs into one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear price for the lot.
Why book with us
- Trusted Arbo and Everbuild sealants
- We are fully insured
- Sanitary silicone with an anti-fungal additive in wet areas
- A 12-month guarantee on all work
Take a look at what affects the cost or customer reviews.
FAQs for Blackmoor
Is Blackmoor within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you work for landlords with property near Liss station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can go on one quote. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear quote.
Can I choose the sealant colour?
We will suggest a colour to suit the surroundings, from white and clear to greys and other shades. The product needed can limit the range.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done.
Where do you work from?
We’re based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Is it OK to seal over old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
How much does sand mastic cost in Blackmoor?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.