Surrey · England
Sand Mastic in Chelsham
We cover Chelsham for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Weathered mastic on the most exposed windows
- Wind and rain getting in round a sash window
- Mastic round period door frames that has failed
Chelsham questions
Can you help a landlord with a rental near Woldingham station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear price.
Do you cover Chelsham for sand mastic?
Yes, Chelsham is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or email us with a few details of the job, and we will send you a clear quote.
How long does sand mastic take to go off?
It takes a while. It skins first and hardens fully later, and we’ll tell you what to expect.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
Is it messy?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Do you take out the old sealant first?
Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Are you insured?
Yes. We are fully insured, and we’ve been doing sealant work for more than 20 years.
What exactly is sand mastic?
It’s sand mixed with a linseed-oil-based binder, used between timber frames and stone or brick.
About our sand mastic in Chelsham
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, and new mastic is applied and shaped by hand. Typical jobs include old cement repairs round a window that have failed and mastic dropping out of the joint, across period & listed homes, stone surrounds and timber door frames.
Mastic can only go onto a dry, clean joint, so window work in Chelsham is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Whatever the size of the job, you get the same 12-month guarantee.
- Place
- Chelsham (CR6)
- Wider area
- Surrey
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Also near Chelsham
Other services in Chelsham
Frames and glazing around Chelsham
With historic houses such as Addington Palace (about 3 miles north) nearby, there’s older building stock in the area around Chelsham as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Church of St Mary the Virgin include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For landlords with property near Woldingham station, any sash windows need sound mastic to keep draughts and rain out.
Chelsham is about 3 miles north-east of Caterham, in Surrey. Homes, rented property, offices and hotels in Chelsham is covered for sand mastic. Every job comes with our 12-month guarantee. Across Surrey, we cover 395 places, Chelsham among them. We also work in London, about 13 miles from Chelsham.
Every address in CR6 is within our area for sand mastic. Streets in the area include Chelsham Common and Chelsham Road. If you’re just outside Chelsham, we cover Farleigh (1 mile north), Warlingham (1 mile west), Hamsey Green (1 mile west), Fickleshole (1 mile north-east) and New Addington (2 miles north). Larger places within reach include Epsom (10 miles west), Horley (11 miles south-west), Redhill (8 miles south-west), Ewell (10 miles west), Reigate (9 miles south-west) and Caterham (3 miles south-west).
What’s near Chelsham
We work in homes and buildings around Warlingham School, Ledgers Wood and Hare & Hounds pub, among other places. Chelsham’s nearest station is Woldingham station, roughly 1.9 miles south-west of the centre. Other landmarks nearby include Warlingham Park Hospital (less than half a mile north) and East Surrey Museum (3 miles south-west). Not far away are Hutchinson's Bank and Nore Hill.
Signs you need sand mastic in Chelsham
Shallow joints are a common cause. A thin layer does not hold well so we make sure the new mastic is the right thickness.
Signs it’s time to call us include:
- Mastic dropping out of the joint
- Open joints round the window box
- Cement or filler used on old window joints that has cracked
- Mastic round period door frames that has failed
Managing a site like Warlingham Village Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- How the colour is chosen
- How long to leave it before use
- Whether they seal over old material or remove it
- Whether they’re fully insured
Honest limits
Before booking, it’s worth knowing the limits:
- Whether work needs listed building consent
- Timber that has rotted
- Cracked or broken glass
If you are not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
Joints and surfaces we work on
- Sash and case windows
- Period & listed homes
- Tenement windows
- Stone surrounds
- Brick reveals
- Timber door frames
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Go gently near the mastic when preparing windows
- Make sure water runs off the sill
- Don’t run silicone over sand mastic
- Look over the window mastic once a year
Don’t run silicone over the new mastic. If anything cracks, get it looked at before trying a quick fix.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
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 fails, we can still redo it.
Landlord and commercial work in Chelsham
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
In hotels, rooms out of use cost money, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
What affects the quote in Chelsham
For a quick quote, just ask. What matters most is:
- Access and height
- Whether old sealant or filler has to be cut out
- The number and length of the joints
- Which sealant suits the joint
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Helping us quote
To make quoting easier, let us know:
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- A few photos by email, if you can
- Where the job is, and your postcode
To get a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. You’ll have a clear quote before we start.
What happens on the day
On the day, we start by going over the job with you. Surfaces next to the work are protected before any work begins. Most jobs take a few hours for a single window, longer for several. Somewhere like Chelsham needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check the window surrounds and agree which joints need renewing.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- 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.
Before we arrive
- Mention if the joints have been sealed before
- Let us know about parking restrictions
- Keep children and pets away from the work area
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or drop us an email.