West Berkshire · England
Sand Mastic in Thatcham
Sand mastic across Thatcham and nearby, with old sealant always removed completely and a one-year guarantee.
- Cracked mastic round a front door frame
- Draughty sash windows at the surround
- Silicone on a period window that looks wrong
Sand mastic for homes and businesses in Thatcham
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we’ll explain which is best for yours. If you are dealing with mastic worn away on windows facing the weather and open joints round the window box, we can put it right, whatever the surface.
Walls in Thatcham that face the prevailing wind take the most weather, so the mastic there tends to fail first. Checking every frame, not just the obvious one, is time well spent.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Thatcham (RG19, RG18)
- Region
- West Berkshire
- Cover
- 12 months on all our work
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Signs you need sand mastic in Thatcham
Paint, silicone or cement used over old mastic causes problems. They do not suit the joint and we normally remove them.
Common reasons people contact us are:
- Mastic dropping out of the joint
- Failed mastic on an exposed elevation
- Draughty sash windows at the surround
- Gaps round a timber door in stone or brick
If you let a flat or house near Thatcham station, older sash windows in a rental need their mastic kept sound to keep the weather out.
What your quote should include
- What insurance they hold
- Is VAT in the price?
- What guarantee comes with the work
- How the joint is cleaned and prepared
What affects the quote in Thatcham
Jobs vary more than people expect. The main factors:
- How many areas need sealing
- The type of sealant required
- The size of the job
- Whether there’s mould to deal with
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we will go through it with you.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Roughly how big the job is
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
- Access, such as stairs, a lift or height
We quote each job on its own. Simply phone 0345 464 0079 or email us and describe the job and send pictures if you have them.
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Windows and doors in Thatcham
Historic houses like Shaw House (about 2.7 miles west) are a reminder that the area around Thatcham has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around United Reformed Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Managing a site like Spurcroft Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Thatcham is about 12 miles north-west of Basingstoke, in West Berkshire. Whether you are in the middle of Thatcham or further out, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Thatcham is one of 155 places in West Berkshire we cover. For nearby work, see our Reading page.
All of RG19 and RG18 is covered for sand mastic. Sand mastic is available to properties on High Street, Station Road and Flagstaff Square and the roads around them. Main roads around Thatcham include the A4, which makes travel easy. If you are just outside Thatcham, we cover Benham Hill (1 mile west), Ashmore Green (2 miles north-west), Cold Ash (2 miles north), Upper Bucklebury (2 miles north-east) and Stone Copse (2 miles north-west). Larger places within reach include Newbury (3 miles west), Burghfield Common (8 miles east), Speenhamland (3 miles west), Hungerford (11 miles west), Spencers Wood (12 miles east) and Calcot (9 miles east). Thatcham is among the bigger towns we cover in West Berkshire.
Local landmarks in Thatcham
We work in homes and buildings around Kennet School and The Old Chequers Public House and the streets around them. The nearest railway station is Thatcham station, roughly 0.9 miles south-east of the centre. Well-known places in the area include Old Chapel Textile Centre (2.2 miles south-west) and West Berkshire Community Hospital (1.5 miles west). Green spaces nearby include Nature Discovery Centre.
Common questions in Thatcham
Is sand mastic in Thatcham guaranteed?
Every job comes with our one-year guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Is Thatcham in your area for sand mastic?
Yes, Thatcham is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing, and we will send you a clear quote.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
How do I get a quote for sand mastic in Thatcham?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we’re done.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Surface by surface
Brick reveals
Loose mastic comes out and deep gaps are packed before pointing.
Tenement and terrace windows
Where a building is shared, window work may involve neighbours so it’s worth checking responsibilities.
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
How the visit works
Once we’re on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to a full day, depending on how many windows. In Thatcham, parking is rarely complicated, though it helps to know about driveways or restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- 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.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
- Clear the area around the work
Ask for a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few photos by email make the job easier to understand, and we will take it from there.
Read more
Leave it or put it right?
Cement-based fillers and modern sealants don’t always suit a period surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. Draughts from a gap round a frame, damp under a sill or water behind a bath panel all start small, and early is when they’re cheapest and quickest to sort.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why choose Mr Mastic in Thatcham
- Over 20 years’ experience
- We never seal over old sealant
- 4.9 on Google from 180+ five-star reviews
- Quality sealants from Arbo and Everbuild
Read how sealant jobs are priced and our reviews.