Hampshire · England
Sand mastic for sash & case windows in Fleet, Hampshire
Sand mastic in Fleet from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Wind and rain getting in round a sash window
- Open joints round the window box
- Silicone on a period window that looks wrong
How we handle sand mastic in Fleet
We work across Fleet renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand, finished to suit the masonry. If you’re dealing with modern sealant on a period surround and mastic that needs renewing before redecorating, we can put it right.
Plenty of homes in a town like Fleet have had conservatories, patio doors or new windows added over the years. Each one adds more joints to look after, and those joints age at different rates. Sills, frame heads and glazing joints are where leaks usually start.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Fleet (GU51, GU52, GU10)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Windows and doors in Fleet
With historic houses such as Farnham Castle (about 4.1 miles south) nearby, there’s older building stock in the area around Fleet as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Heatherside Junior School, its window and door frames need their mastic kept sound, just like a home’s. For landlords with property near Fleet station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Fleet is about 13 miles south-east of Reading, in Hampshire. Whether you’re in the middle of Fleet or further out, sand mastic is available for homes and businesses alike. Fleet is one of 683 places in Hampshire where we work for sand mastic. You can also see our page for Reading, roughly 13 miles from Fleet.
We cover every part of the GU51, GU52 and GU10 postcode area for sand mastic. Whether your property is on Church Road, Durnsford Avenue and Hankins Court or anywhere close by, our applicators can take on the job. Being close to the A323 and A3013, Fleet is simple for us to get to. We also cover Church Crookham (1 mile south-east), Crookham Village (1 mile west), Elvetham Heath (1 mile north-west), Dogmersfield (2 miles west) and Elvetham (2 miles north-west). Further out, we also cover Basingstoke (11 miles west), Farnborough (3 miles north-east), Aldershot (4 miles south-east), Alton (10 miles south-west), Yateley (4 miles north) and Tadley (14 miles north-west). Being one of Hampshire’s larger places, Fleet has every kind of property, from flats to offices.
Around Fleet
Typical jobs here are in homes near Court Moor School, The Prince of Wales pub and School, among other places. Fleet’s nearest station is Fleet station, roughly 1.2 miles north of the centre. Nearby you will also find Royal Army Dental Corps Historical Museum (3.9 miles east) and Fleet Community Hospital (1 mile north-west). Open spaces near Fleet include Fleet Pond Nature Reserve and Hitches Hill.
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
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.
Places near Fleet
Also in Fleet
What we’re called out for in Fleet
Most of it is simply age. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
It’s worth asking for a quote if you see:
- Modern sealant on a period surround
- Mastic worn away on windows facing the weather
- Gaps where the frame meets the masonry
- Draughty sash windows at the surround
If you live in an older home near Fleet Methodist Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What to look for in a quote
- Who turns up on the day
- Are they insured?
- Whether VAT is included
- How the colour is chosen
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
If you manage several properties in or around Fleet, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
Fleet: your questions answered
Is sand mastic in Fleet guaranteed?
Every job comes with our one-year guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Do you work for landlords with property near Fleet station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Do you come to Fleet?
Yes. We are based in Crawley and work across South East England, London and Scotland.
Do you offer different sealant colours?
In most cases you can choose. We will explain which colours are available.
Which is right for my windows, sand mastic or modern sealant?
Sand mastic normally suits period timber windows best. On modern frames, we’d normally use a flexible sealant.
Should I check with the council before work on a listed or conservation-area home?
Check with your local planning authority. They decide whether consent is needed.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages to suit the site.
The process
There is not much for you to do on the day. Point us to the joints and we will get on with it. The work itself takes a few hours per window, depending on the condition of the joints from start to finish. A visit in Fleet needs access to the work and a place to park close by. If the job is outside, mention gates, side access and anything above ground floor.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- Clear the area around the work
- Tell us about any previous sealing or DIY attempts
Getting a quote
For a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Advice
When something else is needed
In fairness, some problems need a different trade:
- Damaged stone surrounds
- Sashes that rattle, stick or will not open
- Cracked or broken glass
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Sash and case windows
- Brick reveals
- Tenement windows
- Period & listed homes
- Timber door frames
- Stone surrounds
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Clear gutters so water does not pour onto the windows
- Sort the mastic before the decorators arrive
- Do not run silicone over sand mastic
- Check the mastic when you check the paintwork
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
What affects the cost of sand mastic
For a quick quote, just ask. The main things that affect it are:
- How much there is to do
- Mould in or behind the old joints
- The old material and how stubborn it is
- Access and height
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What to tell us for a quote
There’s no need for technical detail. It helps if you can tell us:
- Pictures of the joints, sent by email
- What’s wrong with the joints now
- Where the job is, and your postcode
- How we’d reach the joints
There’s no standard price list. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or drop us an email.