Surrey · England
Sand mastic for sash & case windows in Westcott, Surrey
Problem with your window and door surrounds in Westcott? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Modern sealant on a period surround
- Gaps where the frame meets the masonry
- Weathered mastic on the most exposed windows
Sand mastic in Westcott
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we’ll explain which is best for yours. We work on brick reveals, sash and case windows and period & listed homes, and common reasons people get in touch are silicone on a period window that looks wrong and mastic worn away on windows facing the weather.
Around Westcott, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or email us.
- Location
- Westcott (RH4)
- Wider area
- Surrey
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Westcott
Do you work for landlords with property near Dorking West station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before work begins.
Will you come out to Westcott?
Yes, Westcott is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Is it messy?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises. Working times can be discussed when we quote.
Do I need permission for sand mastic on a listed building?
Speak to your local planning authority before work starts. Like-for-like sand mastic is often the preferred finish, but they decide.
Is sand mastic better than silicone for my windows?
That depends on your windows. On many period windows, sand mastic looks right and suits the building, while modern frames normally get a flexible sealant.
Can you replace silicone on a period window with sand mastic?
Normally, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
Also near Westcott
What else we do in Westcott
Why it’s worth doing now in Westcott
An open joint round the frame lets weather in. Left, water can reach the timber and the wall so renewing it early protects the window. Around Westcott, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
Why choose Mr Mastic in Westcott
- Rated 4.9 stars on Google
- An ARBOMaster approved applicator
- We are fully insured
- We never seal over old sealant
Landlords, agents and businesses in Westcott
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
Do you need sand mastic in Westcott?
Most of it is simply age. Even well-laid mastic needs renewing in time and how long it lasts depends on the weather it faces.
Keep an eye out for any of the following:
- Tired mastic found when preparing windows for paint
- Gaps round a timber door in stone or brick
- Cement or filler used on old window joints that has cracked
- Gaps between timber frames and stone or brick
Managing a site like Surrey Hills All Saints Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- What happens if the job turns out different
- Are they insured?
- Whether VAT is included
- What preparation is included
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Frames and glazing around Westcott
Historic houses like Polesden Lacey (about 2.2 miles north) are a reminder that the area around Westcott has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Dorking West station, cracked sand mastic around sash windows lets in the draughts tenants complain about. For an older house near a landmark such as St John's Community Hall, the joint between an old wall and a newer frame is usually the first place rain gets in.
Westcott is about 2 miles west of Dorking, in Surrey. Anywhere in RH4, we cover sand mastic for homes and businesses. Across Surrey, we cover 395 places, and Westcott is one of them. Crawley is on our list too, about 11 miles from Westcott.
Here we cover the RH4 postcode area for sand mastic. Whether your property is on Guildford Road, Chapel Lane and Stones Lane or anywhere close by, our applicators can take on the job. We also cover the places around Westcott: Ranmore Common (1 mile north), Wotton (1 mile south-west), Dorking (2 miles east), North Holmwood (2 miles south-east) and Mid Holmwood (2 miles south-east). We also work in nearby towns such as Guildford (9 miles west), Woking (11 miles north-west), Epsom (9 miles north-east), Horley (9 miles east), Redhill (9 miles east) and Ewell (10 miles north-east).
Around Westcott
Locally, jobs take us to homes and businesses close to The Priory CofE Voluntary Aided School, Milton Heath and The Nower and Pippbrook House. Westcott’s nearest station is Dorking West station, about 1.4 miles north-east. Nearby you’ll also find Headley Court (6 miles north-east) and Mesolithic Museum (2.4 miles south-west). For a walk, there’s Combe Bottom and Box Hill.
What we do, step by step
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself normally takes a few hours per window, depending on the condition of the joints, depending on the size of the job. In a small place like Westcott, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Clear the area around the work
- For business premises, tell us about site rules or sign-in
- Let us know about parking restrictions
Get a quote
For a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. You will have a clear quote before work begins.
Advice
Surface by surface
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
What sealant work cannot fix
In fairness, some problems need a different trade:
- Whether work needs listed building consent
- Sash cords, weights and draught-proofing of the sashes
- Putty and glazing repairs
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before booking.
Surfaces we seal
- Brick reveals
- Tenement windows
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Timber door frames