Buckinghamshire · England
Sand mastic for sash & case windows in Uxbridge, Buckinghamshire
Our applicators work in Uxbridge 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 12-month guarantee.
- Patchy fillers round a sash window
- Window mastic to renew ahead of painting
- Draughty sash windows at the surround
How we handle sand mastic in Uxbridge
Sand mastic doesn’t last for ever, leaving gaps round the window. Renewing it closes the gap so the surround looks right again. If you have failed mastic on an exposed elevation and mastic round period door frames that has failed, we can put it right, on brick reveals, tenement windows and stone surrounds alike.
In a smaller place like Uxbridge, some walls face open ground and catch the full force of the weather. That is hard on the mastic around frames and sills.
We stand behind the work with a one-year guarantee.
- Location
- Uxbridge (UB8, UB10, UB9)
- Region
- Buckinghamshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
When to call us in Uxbridge
Timber swells and shrinks with the weather. The movement cracks the mastic little by little.
Signs it’s time to call us include:
- Mastic that needs renewing before redecorating
- A silicone bead on a sash window that spoils the look
- Open joints round the window box
- Mastic round period door frames that has failed
If you look after a building such as Whitehall Junior School, larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before booking
- Is VAT in the price?
- What guarantee comes with the work
- How much experience the applicator has
- What the cure time is
Surface by surface
Tenement and terrace windows
Windows above ground floor need the right access. Let us know the floor and we’ll confirm access.
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
DIY versus a professional finish
If you’re 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 fails, we can still redo it.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Why deal with it now?
Draughts round a sash window aren’t always the sashes. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. In a smaller place like Uxbridge, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Why Uxbridge clients choose us
- A 12-month guarantee on all work
- Rated 4.9 stars on Google
- Neat joints and a tidy finish
- Any old sealant cut out fully, not covered over
Take a look at how sealant jobs are priced and customer reviews.
How the visit works
The work is kept neat and contained to the joints we are treating, so you can carry on as normal. The job normally takes anything from a few hours to a full day, depending on how many windows, and we explain the cure time before we leave. For a job in Uxbridge, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First we agree which joints need doing.
- 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.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
- For business premises, tell us about site rules or sign-in
Ask for a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we’ll explain what’s involved and give you a clear price.
Read more
Quotes for sand mastic in Uxbridge
The price is agreed before any work begins. It’s based on:
- The type of sealant required
- When we can work, for business premises
- The old material and how stubborn it is
- The number and length of the joints
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
Helping us quote
Photos help, but a description is a good start. Please mention:
- Pictures of the joints, sent by email
- How we’d reach the joints
- The type of property
- Any previous sealing or DIY work
We quote each job on its own, so the first step is telling us about yours. Just call 0345 464 0079 or drop us an email with the details and send pictures if you have them.
Windows and doors in Uxbridge
With historic houses such as Ickenham Hall (about 2.2 miles north-east) nearby, there’s older building stock in the area around Uxbridge as well as newer homes. 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near West Drayton station, any sash windows need sound mastic to keep draughts and rain out. If you live in an older home near Church of St Andrew, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Uxbridge is about 3 miles north-west of Hayes, in Buckinghamshire. Uxbridge gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 263 towns and villages across Buckinghamshire, from the larger towns to small villages. You can also see our page for London, roughly 17 miles from Uxbridge.
All of UB8, UB10 and UB9 is within our area for sand mastic. Sand mastic is available to properties on York Road, Lawn Road and How's Road. You will find Uxbridge on the A4007, which makes it straightforward to reach. We also cover the places around Uxbridge: Cowley (1 mile south), New Denham (1 mile north-west), Hillingdon (1 mile east), Ickenham (2 miles north-east) and Yiewsley (2 miles south). Larger places within reach include High Wycombe (13 miles north-west), Chesham (13 miles north-west), Marlow (13 miles west), Amersham (11 miles north-west), Beaconsfield (9 miles north-west) and Chalfont St Peter (6 miles north-west).
Landmarks near Uxbridge
Typical jobs here are in homes near Uxbridge High School, West Middlesex College and Three Tuns pub. The nearest railway station is West Drayton station, roughly 2.1 miles south. Well-known places in the area include The Chimes (under half a mile north) and Hillingdon Hospital (1.2 miles south-east). For a walk, there’s Northala Fields and Uxbridge Moor.
Aftercare tips
Looking after new joints is easy:
- Check with your local planning authority if your home is listed
- Sort the mastic before the decorators arrive
- Leave the new mastic unpainted
- Avoid heavy scraping on the mastic joint
Leave the new mastic unpainted, which is the traditional advice. Ask us before any decorating around it.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
Uxbridge questions
Will you come out to Uxbridge?
Yes. Uxbridge is within the area we cover, which takes in towns, villages and rural addresses. 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 West Drayton station?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Uxbridge, along with the rest of our area.
How long will you be here?
A typical job takes anything from a few hours to a full day, depending on how many windows, including preparation and clearing up. Your quote will say how long we expect yours to take.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and we will quote it together.
Can you work on commercial sites?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.