Surrey · England
Westhumble Sand Mastic
Sand mastic across Westhumble and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Gaps round a timber door in stone or brick
- Crumbling sand mastic round a window
- Mastic worn away on windows facing the weather
Sand mastic in Westhumble, done properly
Across Westhumble, we renew sand mastic around sash and case windows. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. We work on period & listed homes, timber door frames and tenement windows, and the jobs we see most are open joints round the window box and tired mastic found when preparing windows for paint.
Mastic can only go onto a dry, clean joint, so window work in Westhumble is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Every job is covered by a one-year guarantee.
- Location
- Westhumble (RH5)
- Wider area
- Surrey
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
FAQs for Westhumble
Do you work for landlords with property near Box Hill & Westhumble station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before work begins.
Is Westhumble within the area you cover?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can old silicone round a sash window be swapped for sand mastic?
In most cases. The silicone is cut out and the joint cleaned before the sand mastic goes in.
Which products do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll tell you what we’re using.
How long will you be here?
As a guide, most jobs take a few hours for a single window, longer for several. Larger jobs naturally take longer.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Is there any odour?
There can be a smell while the sealant cures. Ventilation helps.
What we do, step by step
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Westhumble, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic isn’t too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Let us know about earlier repairs to the joints
- Mention any sign-in or site rules at work premises
- Move anything stored near the joints
Getting a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we will come back to you with a quote.
Advice
Windows and doors in Westhumble
With historic houses such as Polesden Lacey (about 1.8 miles west) nearby, there’s older building stock in the area around Westhumble as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
Homes close to Church of St Michael include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Managing a site like The Ashcombe School? Then its window and door frames need their mastic kept sound, just like a home’s.
Westhumble is about 2 miles north of Dorking, in Surrey. If you need sand mastic in Westhumble, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We are based in Crawley and cover Surrey. 395 places in Surrey are on our list, large and small. There’s also a page for Crawley, about 12 miles away.
Here we cover the RH5 postcode area for sand mastic. Whether your property is on Adlers Lane, Chapel Lane and Burney Road or a nearby road, our applicators can take on the job. We also cover the places around Westhumble: Pixham (1 mile south-east), Mickleham (1 mile north-east), Ranmore Common (2 miles south-west), Dorking (2 miles south) and Westcott (2 miles south-west). Within a short drive, we also cover Guildford (10 miles west), Woking (11 miles north-west), Epsom (6 miles north-east), Horley (9 miles south-east), Redhill (7 miles east) and Ewell (8 miles north-east).
Local landmarks in Westhumble
Typical jobs here are in homes near Norbury Park, Stepping Stones pub and Pippbrook House, among other places. Westhumble has its own railway station: Box Hill & Westhumble station. Nearby you’ll also find Headley Court (3.6 miles north-east) and Betchworth Castle (1.9 miles south-east). Not far away are Box Hill and Reigate Heath.
What affects the cost of sand mastic
Every job gets its own quote. These are the things that affect it:
- Mould in or behind the old joints
- Any working-time requirements on site
- The number and length of the joints
- How easy the joints are to reach
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Pictures of the joints, sent by email
- The rough size of the job
- How we’d reach the joints
- Whether it has been sealed before
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
How to look after the new joints
A little care helps the new joints last. Our advice:
- Have rotten timber repaired before new mastic goes in
- Take care around the mastic when scraping paint
- Ask us before painting near the mastic
- Ask the planning authority about consent for listed or conservation-area homes
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
When to call us in Westhumble
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
Most people get in touch when they notice one of these:
- Gaps where the frame meets the masonry
- Wind and rain getting in round a sash window
- Mastic that needs renewing before redecorating
- Mastic dropping out of the joint
Letting a property close to Box Hill & Westhumble station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- How the joint is cleaned and prepared
- Whether the sealant suits the joint
- Who does the work, and how experienced they are
- What the cure time is
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
What the job involves on each surface
Period and listed homes
On a listed home or in a conservation area, the right material matters. Sand mastic is often the preferred finish.
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Nearby places to Westhumble
Other services in Westhumble
Landlords, agents and businesses in Westhumble
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.