West Berkshire · England
Sand mastic for sash & case windows in Lambourn, West Berkshire
Sand mastic for Lambourn, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Open joints round the window box
- Old cement repairs round a window that have failed
- Modern sealant on a period surround
About our sand mastic in Lambourn
A silicone bead around a sash window can look out of place and is not always the right material. Sand mastic gives a finish that matches the age of the house and we can swap the silicone for it. We work on timber door frames, sash and case windows and brick reveals, and the jobs we see most are gaps between timber frames and stone or brick and mastic that needs renewing before redecorating.
Houses in smaller places like Lambourn can stand more in the open than those in a built-up town. That’s hard on the mastic around frames and sills.
A one-year guarantee comes as standard, so you are not left on your own once the job is done.
- Place
- Lambourn (RG17)
- Wider area
- West Berkshire
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
For anyone letting property in or around Lambourn, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.
Leave it or put it right?
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Homes in smaller places like Lambourn can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why choose Mr Mastic in Lambourn
- Trusted Arbo and Everbuild sealants
- Fully insured
- More than 20 years in sealant work
- Every job guaranteed for a year
Surface by surface
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. It’s renewed by hand.
Brick reveals
We rake out the old mastic and pack deep voids before the new mastic goes in.
What we do, step by step
When we arrive, we look over the joints with you first, so you know exactly what we’re doing. Surfaces next to the work are protected before any work starts. Most jobs take anything from a few hours to a full day, depending on how many windows. For a job in Lambourn, 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.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Mention any sign-in or site rules at work premises
- Keep pets and children clear of the area while we work
How to get a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll explain what’s involved.
Advice
Common problems we fix in Lambourn
Rain on the window surround works into any crack and pushes it out. Exposed elevations usually fail first.
These are the problems we are asked about most:
- Weathered mastic on the most exposed windows
- Mastic dropping out of the joint
- Gaps where the frame meets the masonry
- Old cement repairs round a window that have failed
For site and facilities teams at buildings such as Lambourn CofE Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- When the joint can take water or movement
- Which colour the sealant will be
- What guarantee comes with the work
- Whether all the old sealant comes out first
Sand mastic in Lambourn: local notes
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Ashdown House (about 3.5 miles north-west) are a reminder that the area around Lambourn has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For an older house near a landmark such as Church of St Michael and All Angels, the joint between an old wall and a newer frame is normally the first place rain gets in.
Lambourn is about 7 miles south-west of Wantage, in West Berkshire. Across the RG17 area, we can carry out sand mastic at your property. Our area takes in 155 places across West Berkshire, from the larger towns to small villages. There’s also a page for Oxford, about 21 miles away.
We cover every part of RG17 for sand mastic. You’ll find streets such as High Street, Station Road and Chapel Lane. Neighbouring places we cover for sand mastic include Sheepdrove (1 mile north-east), Upper Lambourn (1 mile north-west), Westcot (6 miles north), Sparsholt (6 miles north) and Kingston Lisle (6 miles north). Within a short drive, we also cover Newbury (12 miles south-east), Thatcham (14 miles south-east), Speenhamland (11 miles south-east), Hungerford (7 miles south), Shaw (12 miles south-east) and Wash Common (12 miles south-east). Lambourn is one of the larger places we cover in West Berkshire.
Local landmarks in Lambourn
We work in homes and buildings around The George pub and the streets around them. The countryside around Lambourn includes Watts Bank and Rams Hill.
Lambourn questions
Can you do sand mastic in Lambourn?
Yes, Lambourn is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job.
Is there a guarantee on sand mastic in Lambourn?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Can I choose the sealant colour?
Yes. White, clear and grey are common, and other colours are available for many products, and we’ll agree it with you first.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Which is right for my windows, sand mastic or modern sealant?
That depends on your windows. Period windows in stone or brick generally suit sand mastic, while modern frames normally get a flexible sealant.
Can sand mastic be painted?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we will advise.
How long does sand mastic take?
It depends on the size of the job, but most jobs take a few hours per window, depending on the condition of the joints. We will tell you when we quote.
Can you do several jobs on one visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
Honest limits
We will always be straight with you, so here’s what new sealant will not do:
- Crumbling stone or brickwork round the window
- Putty and glazing repairs
- Timber that has rotted
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Surfaces we seal
- Sash and case windows
- Timber door frames
- Period & listed homes
- Brick reveals
- Tenement windows
- Stone surrounds
Nearby places to Lambourn
What else we do in Lambourn
Quotes for sand mastic in Lambourn
We do not publish a price list, because jobs vary so much. The quote depends on:
- The type of sealant required
- The size of the job
- Any working-time requirements on site
- The number of rooms or windows
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- The type of property
- Where the property is
- The rough size of the job
- How we’d reach the joints
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.