Wokingham · England
Window Mastic in Waltham St Lawrence
Window mastic for Waltham St Lawrence and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- A bead that does not match the frame
- Gaps left after new windows were fitted
- Whistling draughts around closed windows
How the visit works
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes a few hours for a handful of frames, longer for a whole house, including the tidy-up. Somewhere as small as Waltham St Lawrence, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Tell us about any water getting in
- Let us know about earlier repairs to the joints
Get a quote
Need a quote? Please ring 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Advice
Window mastic in Waltham St Lawrence, done properly
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. If you’re dealing with cracked sealant at the sill ends and damp patches on the reveal after heavy rain, we can help.
Mastic can only go onto a dry, clean joint, so window work in Waltham St Lawrence is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Big or small, it’s backed by our 12-month guarantee.
- Location
- Waltham St Lawrence (RG10)
- Wider area
- Wokingham
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Windows and doors in Waltham St Lawrence
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Harleyford Manor (about 4.7 miles north) are a reminder that the area around Waltham St Lawrence has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For an older house near a landmark such as Church of St Lawrence, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Letting a property close to Twyford station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Waltham St Lawrence is about 4 miles south-west of Maidenhead, in Wokingham. Our applicators cover window mastic for homes and businesses in Waltham St Lawrence. 35 places in Wokingham are on our list, from the larger towns to small villages. For nearby work, see our Reading page, about 8 miles away.
All of RG10 is covered for window mastic, from the main roads to the quietest streets. Streets in the area include The Street, Halls Lane and Broadmoor Road, all of which we cover. Nearby, we also carry out window mastic in Kiln Green (1 mile north-west), Shurlock Row (1 mile south), Hungerford (1 mile south), The Holt (2 miles north-west) and Hare Hatch (2 miles west). Within a short drive, we also cover Reading (8 miles west), Wokingham (6 miles south), Woodley (4 miles south-west), Earley (7 miles south-west), Crowthorne (8 miles south) and Lower Earley (6 miles south-west).
Local landmarks in Waltham St Lawrence
Waltham St Lawrence’s nearest station is Twyford station, roughly 2.6 miles west. A little further out are St Mark's Hospital (3.8 miles north-east). The countryside around Waltham St Lawrence includes Hurley Chalk Pit and Weycock Hill.
Your questions about window mastic in Waltham St Lawrence
Do you cover Waltham St Lawrence for window mastic?
Yes, Waltham St Lawrence is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear quote.
Can you help a landlord with a rental near Twyford station?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Do you work on first-floor windows?
Yes, where they can be reached safely. Tell us about access when you get in touch so we can plan the job.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses and we’re fully insured.
What should I tell you?
A short description and the location. We’ll ask anything else we need to know.
Where is Mr Mastic based?
We are based in Crawley, and we cover South East England, London and all of Scotland.
Different surfaces, different methods
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it without cracking.
Window sills
Sills catch the water running down the glass, so the joints at each end and underneath matter. Each is cleaned out and resealed.
Towns and villages near Waltham St Lawrence
Other services in Waltham St Lawrence
Quotes for window mastic in Waltham St Lawrence
The quote reflects the job in front of us. We take into account:
- How much old sealant there is and how hard it is to remove
- How many areas need sealing
- The amount of work
- When we can work, for business premises
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first.
Asking for a quote
You do not need to know the technical terms. It helps if you can tell us:
- If it’s domestic, commercial or a hotel
- Access, such as stairs, a lift or height
- Where the property is
- The rough size of the job
For a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. You will have a clear quote before work begins.
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep paint off silicone joints
- Keep paint and stain on wooden frames in good order
- Walk round the house once a year and look at the joints
- Wipe condensation off the frames
Have a look at the joints once a year, ideally after winter. Cracks and lifting edges are easy to spot early, and if anything looks wrong, just ring 0345 464 0079 or drop us an email.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Common problems we fix in Waltham St Lawrence
Joint shape matters as much as the product. A thin smear across a wide gap has nothing to it, while a joint packed solid cannot stretch. That’s what backing rod is for.
If you can see any of these, it’s time to have the joints looked at:
- Cracked internal joints between frame and plaster
- Mastic that has split away from the wall
- Rushed sealant from a window installation
- Rain getting in at the frame or under the sill
If you look after a building such as Waltham St Lawrence Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- What the cure time is
- How the surfaces are prepared before sealing
- How long the guarantee is
- Who does the work, and how experienced they are