Buckinghamshire · England
Sand mastic for sash & case windows in Forty Green, Buckinghamshire
Window and door surrounds in Forty Green need attention? We cut out the old, prepare the joints and apply the right sealant.
- Mastic worn away on windows facing the weather
- Crumbling sand mastic round a window
- Draughty sash windows at the surround
Different surfaces, different methods
Timber door frames
Round a period front door, sand mastic gives the right look.
Stone surrounds
Old stone surrounds are often uneven, so the gap isn’t the same all the way round. Sand mastic is shaped by hand to suit.
Sand mastic for homes and businesses in Forty Green
Across Forty Green, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand, finished to suit the masonry. We work on period & listed homes, brick reveals and stone surrounds, and common reasons people get in touch are old cement repairs round a window that have failed and a silicone bead on a sash window that spoils the look.
Outdoor sealant needs dry, clean surfaces, so work on frames around Forty Green is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
You get a 12-month guarantee, the same in Forty Green as everywhere else we work.
- Location
- Forty Green (HP27)
- Wider area
- Buckinghamshire
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Forty Green
More services for Forty Green
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Landlords, agents and businesses in Forty Green
Housing providers, facilities teams and property managers book us too in Forty Green and across Buckinghamshire. Several sites can go on one quote, and we are fully insured for the work.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
What affects the cost of sand mastic
We quote each job individually. This is what makes a difference:
- The old material and how stubborn it is
- Whether there’s mould to deal with
- Which sealant suits the joint
- Whether the work is at height
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or email us and we’ll talk you through it.
What we need to know
There’s no need for technical detail. Just tell us:
- A few photos by email, if you can
- If someone has resealed it before
- If it’s domestic, commercial or a hotel
- Roughly how big the job is
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Frames and glazing around Forty Green
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. Historic houses like Adwell House (about 4.8 miles south-west) are a reminder that the area around Forty Green has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Letting a property close to Princes Risborough station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. Historic houses such as Adwell House, about 4.8 miles south-west, show how far back building around Forty Green goes, and older homes nearby need a sealant that suits their walls.
Forty Green is about 4 miles south-east of Thame, in Buckinghamshire. If you need sand mastic in Forty Green, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We are based in Crawley and cover Buckinghamshire, Forty Green included. Our area takes in 263 places across Buckinghamshire, from the larger towns to small villages. There’s also a page for Oxford, about 14 miles away.
Here we cover the HP27 postcode area for sand mastic. Neighbouring places we cover for sand mastic include Henton (1 mile south), Holly Green (1 mile east), Skittle Green (1 mile south-east), Pitch Green (1 mile east) and Bledlow (1 mile south-east). Larger places within reach include Aylesbury (7 miles north-east), High Wycombe (9 miles south-east), Chesham (12 miles east), Marlow (12 miles south-east), Amersham (13 miles east) and Beaconsfield (13 miles south-east).
Landmarks near Forty Green
Typical jobs here are in homes near The Peacock Country Inn. Forty Green’s nearest station is Princes Risborough station, roughly 2.3 miles east. Other landmarks nearby include Thame Community Hospital (3.4 miles north-west) and Great Kimble Dial Hill (4.1 miles east). For a walk, there’s Beacon Hill and Oakley Hill nature reserve.
Why act early in Forty Green
An open joint round the frame lets weather in. Left, water can reach the timber and the wall, so dealing with it now protects both. In a small place like Forty Green, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Leaving a failed joint generally makes the job bigger, not smaller. If you’re not sure whether it needs doing, phone 0345 464 0079 or email us for an honest opinion and a quote.
Why us?
- Arbo and Everbuild products
- Anti-fungal sanitary silicone in wet areas
- One-year guarantee on every job
- Experience in homes, commercial sites and hotels
Read what affects the cost or customer reviews.
Questions from Forty Green
Can you help a landlord with a rental near Princes Risborough station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Can you do sand mastic in Forty Green?
Yes. We work across London and the South East, and Forty Green is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing.
Where is Mr Mastic based?
We are based in Crawley, and we work across South East England, London and Scotland.
Do you remove the old sealant?
Yes, every time. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Are you fully insured?
Yes. We are fully insured, and we have been doing sealant work for more than 20 years.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done.
How do I get a quote for sand mastic in Forty Green?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
Can you replace silicone on a period window with sand mastic?
In most cases. We remove the silicone and clean the joint before the sand mastic goes in.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Take care around the mastic when scraping paint
- Look over the window mastic once a year
- Keep sills and gutters clear so water drains away
- Ask us before painting near the mastic
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look rather than patching it.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber and timber that stays wet can rot.
What we do, step by step
Good joint work is mostly preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours for a single window, longer for several. In a small place like Forty Green, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Mention if the joints have been sealed before
- Tell us if parking is tricky
Getting a quote
For sand mastic in Forty Green, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.