Buckinghamshire · England
Sand mastic for sash & case windows in The City, Buckinghamshire
Sand mastic in The City from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Modern sealant on a period surround
- Tired mastic found when preparing windows for paint
- Old cement repairs round a window that have failed
Honest limits
Before you book, it’s worth knowing the limits:
- Damaged stone surrounds
- Planning or listed building consent (your local planning authority decides)
- Sash cords, weights and draught-proofing of the sashes
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
Surfaces we seal
- Tenement windows
- Stone surrounds
- Sash and case windows
- Period & listed homes
- Brick reveals
- Timber door frames
About our sand mastic in The City
Traditional burnt sand mastic that sits naturally against stone and brick. It suits period and listed homes, where modern sealant can look out of place. If you are dealing with draughts and rain around sash boxes and mastic dropping out of the joint, we can put it right, on sash and case windows, timber door frames and tenement windows alike.
Around The City, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
We stand behind the work with a 12-month guarantee, so you’re covered after we’ve gone.
- Where
- The City (HP14)
- Wider area
- Buckinghamshire
- Cover
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Questions from The City
Can you do sand mastic in The City?
Yes. We work across London and the South East, and The City is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.
Is The City within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do I need permission for sand mastic on a listed building?
Check with your local planning authority. They decide whether consent is needed for work to your windows.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
How long does the job take?
It depends on the size of the job, but most jobs take anything from a few hours to a full day, depending on how many windows. We’ll tell you when we quote.
Are you insured?
Yes. We are fully insured, and we can confirm the details when we quote.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Sand mastic in The City: local notes
With historic houses such as West Wycombe Park House (about 2.7 miles south-east) nearby, there’s older building stock in the area around The City as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. 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.
If you live in an older home near Church of St Paul, the joint between an old wall and a newer frame is usually the first place rain gets in. Managing a site like Radnage Church of England Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. If you let a flat or house near Saunderton station, any sash windows need sound mastic to keep draughts and rain out.
The City is about 5 miles north-west of High Wycombe, in Buckinghamshire. We carry out sand mastic for homeowners, landlords and businesses in The City and the surrounding area, as part of our work across Buckinghamshire. Across Buckinghamshire, we cover 263 places, and The City is one of them. Our Reading page covers work nearby.
Jobs for sand mastic in HP14 works the same way as everywhere else we cover. That includes homes and businesses on Bottle Square Lane, Radnage Common Road and Green Lane and the roads around them. We also cover Waterend (1 mile west), Beacon's Bottom (1 mile south-west), Radnage (1 mile north), Bennett End (1 mile north-west) and Green End (1 mile south-east). We also work in nearby towns such as Aylesbury (11 miles north), High Wycombe (5 miles south-east), Chesham (11 miles east), Marlow (7 miles south-east), Amersham (11 miles east) and Beaconsfield (10 miles east).
Around The City
We work in homes and buildings around The Crown pub, among other places. The nearest railway station is Saunderton station, roughly 1.8 miles north-east of the centre. Well-known places in the area include Wycombe Hospital (5 miles south-east). Green spaces nearby include Yoesden and Bald Hill.
Keeping the joints in good condition
A little care helps the new joints last. Our advice:
- Get any rot dealt with first
- Inspect the joints round the windows every year or so
- Sort the mastic before the decorators arrive
- Ask the planning authority about consent for listed or conservation-area homes
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
What happens on the day
You do not need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the work takes a few hours per window, depending on the condition of the joints for a typical job. For a village or hamlet like The City, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Move anything stored near the joints
- Keep pets and children clear of the area while we work
- Try not to wet indoor joints just before the visit
Ask for a quote
For sand mastic in The City, ring 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Read more
Towns and villages near The City
What else we do in The City
For landlords and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
How we quote for sand mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether the work is at height
- Mould in or behind the old joints
- How many rooms, windows or areas are involved
- The size of the job
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Helping us quote
When you call or email, it’s useful to know:
- The address or postcode of the job
- If someone has resealed it before
- How we’d reach the joints
- The type of property
Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or send us an email with the details and send photos if you have them.
What happens if it’s left?
Gaps round a sash window let in rain and draughts. Left, water can reach the timber and the wall, so dealing with it now protects both. Where a wall is exposed, as many are in small places like The City, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we’ll go through it with you.
Why choose Mr Mastic in The City
- Domestic, commercial and hotel work
- Sanitary silicone with an anti-fungal additive in wet areas
- ARBOMaster approved applicator
- Over 20 years’ experience
Take a look at what affects the cost or customer reviews.
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.