Greater London · England
Sand Mastic in Roxeth
Professional sand mastic in and around Roxeth, with every bit of old sealant taken out first and a 12-month guarantee.
- Silicone on a period window that looks wrong
- Draughts and rain around sash boxes
- Gaps between timber frames and stone or brick
About our sand mastic in Roxeth
Sand mastic doesn’t last for ever and gaps open up round the frame. Renewing it closes the gap and tidies the surround. We work on tenement windows, sash and case windows and period & listed homes, and common reasons people get in touch are gaps where the frame meets the masonry and patchy fillers round a sash window.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- Roxeth (HA2, HA1, UB5)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Roxeth
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint.
People normally contact us when they notice something like this:
- Mastic dropping out of the joint
- Mastic round period door frames that has failed
- Silicone on a period window that looks wrong
- Draughty sash windows at the surround
Homes close to Christ Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Comparing quotes
- Whether you can choose the colour
- How long to leave it before use
- What happens if the job turns out different
- Is the old sealant removed completely?
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Leave the new mastic unpainted
- Renew mastic before redecorating the windows
- Go gently near the mastic when preparing windows
- Don’t run silicone over sand mastic
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Different surfaces, different methods
Sash and case windows
Sash windows are where we do most sand mastic work. Each joint round the box is raked out and renewed.
Stone surrounds
The stone is treated with care while raking out the old mastic.
The process
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours per window, depending on the condition of the joints. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Roxeth. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The mastic is finished to sit tidily against the stone or brick.
How to prepare
- For business premises, tell us about site rules or sign-in
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us if parking is tricky
Getting a quote
We do not publish a price list. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or send us an email.
Advice
What sand mastic looks like in Roxeth
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. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
As a London address, Roxeth can be tricky for parking: let us know about parking bays, permits or a driveway. Schools such as Roxeth Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Roxeth is about 1 mile south of Harrow, in Greater London. Jobs in Roxeth get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across Greater London, we cover 764 places, Roxeth among them. For nearby work, see our London page.
Jobs for sand mastic in HA2, HA1 and UB5 works the same way as everywhere else we cover. If you need sand mastic at a property on Lower Road, Grange Road and Dudley Road or a nearby road, our applicators can take on the job. Other places close to Roxeth include South Harrow (1 mile south-west), Harrow (1 mile north), Harrow on the Hill (1 mile east), Northwick Park (1 mile north-east) and Rayners Lane (1 mile west). Larger places within reach include London (12 miles south-east), City of Westminster (9 miles south-east), Marylebone (9 miles east), Kensington (8 miles south-east), St Pancras (10 miles east) and Shoreditch (12 miles east).
Landmarks near Roxeth
In Roxeth, that means homes and buildings near The White Horse pub, Orley Farm School and Northwick Park, among other places. For rail, the closest station is Sudbury Hill Harrow station, about 0.8 miles south-east of the centre. Nearby you will also find Clementine Churchill Hospital (0.7 miles east) and Kodak Museum (1.7 miles north). Green spaces nearby include Northala Fields and Perivale Wood.
Also in Roxeth
What sealant work can’t fix
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Damaged stone surrounds
- Timber that has rotted
- Broken panes
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Sash and case windows
- Timber door frames
- Tenement windows
- Period & listed homes
- Brick reveals
- Stone surrounds
Questions from Roxeth
Is parking a problem for a job in Roxeth?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Can you do sand mastic in Roxeth?
Yes, Roxeth is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing.
Are you insured?
Yes. We’re fully insured, and we have been doing sealant work for more than 20 years.
Should I use sand mastic or silicone?
We’ll talk it through with you. Period homes often look best with sand mastic, and modern sealants suit newer frames.
Is it messy?
Very little: the area around the joints is protected first, and we tidy up before we go.
Is it possible to take out silicone and use sand mastic instead?
Yes, we do this often. All the old silicone is removed first so the mastic can sit properly.
How much does sand mastic cost in Roxeth?
Size, access and the old material all affect the cost. Call for a quick quote.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Quotes for sand mastic in Roxeth
We do not publish a price list. The quote depends on:
- How many rooms, windows or areas are involved
- Any working-time requirements on site
- The product the joint needs
- The size of the job
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
What we need to know
When you call or email, these details help:
- If it’s domestic, commercial or a hotel
- Where the job is, and your postcode
- Photos by email, if that is easy
- The rough size of the job
It all starts with a short chat. Describe the problem, the location and the size of the job. Whenever you’re ready, phone 0345 464 0079 or send us an email.
Work for landlords, hotels and businesses
For anyone letting property in or around Roxeth, several properties can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.