Surrey · England
Sand Mastic in Merrow
Sand mastic across Merrow and nearby, with old sealant always removed completely.
- Old cement repairs round a window that have failed
- Silicone on a period window that looks wrong
- Cracked mastic round a front door frame
What we can’t put right
We won’t take on work that will not last, so these are the limits:
- Damaged stone surrounds
- Whether work needs listed building consent
- Broken panes
If in doubt, phone 0345 464 0079 or email us and we will say what we think before you book.
Surfaces we seal
- Timber door frames
- Stone surrounds
- Tenement windows
- Sash and case windows
- Period & listed homes
- Brick reveals
Sand mastic in Merrow
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Sand mastic is often favoured as a like-for-like material. We work on period & listed homes, tenement windows and stone surrounds, and people most often call us about silicone on a period window that looks wrong and tired mastic found when preparing windows for paint.
Houses in smaller places like Merrow can stand more in the open than those in a built-up town, so exposed windows and doors face the weather head on. The mastic around frames on those walls tends to age faster.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Place
- Merrow (GU1, GU4)
- Wider area
- Surrey
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Why act early in Merrow
New sash windows are a major, costly change, and in listed buildings it may need consent. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. In a smaller place like Merrow, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
Why choose Mr Mastic in Merrow
- Approved under the ARBOMaster scheme
- We leave the area clean and tidy
- Any old sealant cut out fully, not covered over
- Quality sealants from Arbo and Everbuild
Merrow homes and the weather
With historic houses such as Clandon Park (about 0.9 miles east) nearby, there’s older building stock in the area around Merrow 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Bushy Hill Junior School, its window and door frames need their mastic kept sound, just like a home’s. In the older streets around Church of St John the Evangelist, the joint between an old wall and a newer frame is generally the first place rain gets in.
Merrow is about 2 miles east of Guildford, in Surrey. We provide sand mastic to homes and businesses in Merrow. Merrow is one of 395 places in Surrey where we work. Our Crawley page covers work nearby, about 17 miles away.
Every address in GU1 and GU4 is within our area for sand mastic, from the main roads to the quietest streets. You will find streets such as Park Lane, Grove Road and Wykeham Road. Other places close to Merrow include Burpham (1 mile north-west), Abbotswood (1 mile west), West Clandon (2 miles north-east), Guildford (2 miles west) and Chilworth (2 miles south). Within a short drive, we also cover Woking (5 miles north), Camberley (11 miles north-west), Epsom (13 miles north-east), Farnham (12 miles west), Ewell (14 miles north-east) and Egham (13 miles north).
Landmarks near Merrow
Around Merrow, our work takes us to homes and buildings near St Peter's Catholic School, St Peter's Catholic School and Riverside Park, among other places. The closest station to Merrow is Clandon station, about 1.6 miles north-east. Nearby you’ll also find Guildford Castle (2.1 miles south-west) and Surrey Infantry Museum (0.6 miles north-east). Open spaces near Merrow include St Martha's Hill and Colyer's Hanger and Silent Pool.
When to call us in Merrow
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
Look out for any of the following:
- Crumbling sand mastic round a window
- Failed mastic on an exposed elevation
- Silicone on a period window that looks wrong
- Window mastic to renew ahead of painting
For landlords with property near Clandon station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
What to look for in a quote
- Who does the work, and how experienced they are
- Is the old sealant removed completely?
- What guarantee comes with the work
- Whether they’re fully insured
Nearby places to Merrow
What else we do in Merrow
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
How the visit works
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and clear up. It generally takes a few hours per window, depending on the condition of the joints. For a job in Merrow, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- 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
- Tell us about access, such as stairs, a lift or high-level joints
- Try not to wet indoor joints just before the visit
- Clear the area around the work
Ask for a quote
There’s no standard price list. Instead, we send you a clear quote for your job. To arrange one, call 0345 464 0079 or email us.
Related advice
Merrow: your questions answered
Is Merrow in your area for sand mastic?
Yes. Our work covers London and the South East, and Merrow is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we will send you a clear quote.
Can you help a landlord with a rental near Clandon 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 we start.
Do you offer different sealant colours?
We help you choose a colour that suits, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Can you do several jobs on one visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Where are you based?
We work from Crawley. Our applicators cover Merrow, along with the rest of our area.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first.
What do you need from me for a quote?
Just the basics: the address or postcode, what’s wrong and any access issues. Then call 0345 464 0079 or drop us an email.
Should I use sand mastic or silicone?
It depends on the window. On many period windows, sand mastic looks right and suits the building and newer frames usually get a flexible sealant.
What affects the cost of sand mastic
Your quote is based on your job. We take into account:
- The number and length of the joints
- Mould in or behind the old joints
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
Asking for a quote
You don’t need to know the technical terms. It helps if you can tell us:
- Photos by email, if that’s easy
- The type of property
- If someone has resealed it before
- The problem you’ve noticed
We quote each job on its own. Simply phone 0345 464 0079 or email us and describe the job, and pictures are welcome.