Hertfordshire · England
Window Mastic in Sarratt
Specialist window mastic for Sarratt: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Whistling draughts around closed windows
- A bead that does not match the frame
- Rain getting in at the frame or under the sill
The process
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes most of a day for a typical house, less for a few frames. For a village or hamlet like Sarratt, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- On commercial sites, let us know about site rules
- Let us know about parking restrictions
Getting a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
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Window mastic in Sarratt, done properly
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re fully insured ARBOMaster approved applicators, and we give a 12-month guarantee on the work. We work on composite doors, timber windows & doors and uPVC windows, and the jobs we see most are rain getting in at the frame or under the sill and gaps where the sill meets the wall.
Homes in small places like Sarratt often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
Our work is backed for twelve months.
- Location
- Sarratt (WD3)
- Region
- Hertfordshire
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We’ll tell you if that is what we find.
Window sills
Stone and concrete sills have their own joints, and the joint under the frame can let rain run behind. Those are sealed with a product suited to stone or concrete.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Avoid harsh chemicals near the mastic
- Keep drainage slots and sill grooves clear
- Use gentle cleaners on frames and sealant
- Air rooms to keep condensation down around windows
Most silicone sealants won’t take paint, so mention any painting plans before any work starts. We can use a paintable sealant where that matters.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
What we can’t put right
To be straight with you, some problems need a different trade:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A frame that has rotted at the joint
- Faulty window hardware
If you are not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
Where we work in Sarratt
- Composite doors
- Window sills
- uPVC windows
- Timber windows & doors
- Patio & French doors
- Aluminium frames
Your questions about window mastic in Sarratt
Do you work for landlords with property near Chorleywood station?
Yes. We work for landlords and letting agents as well as householders. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Do you cover smaller places like Sarratt?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Which products do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Can resealing stop a draught around my window?
Yes, if the air is getting in around the frame. If it’s coming through the window seals, we will tell you.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Why deal with it now?
Running fresh sealant over the old joint is tempting, but it won’t grip old, dirty sealant. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. Around Sarratt, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Why Sarratt customers choose us
- Experience in homes, commercial sites and hotels
- 180+ five-star Google reviews
- Trusted Arbo and Everbuild sealants
- Approved under the ARBOMaster scheme
Take a look at how sealant jobs are priced or our reviews.
How we quote for window mastic
The quote reflects the job in front of us. We take into account:
- The amount of work
- When we can work, for business premises
- How many rooms, windows or areas are involved
- Whether the work is at height
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What we need to know
You don’t need to know the technical terms. Just tell us:
- Photos by email, if that’s easy
- Whether it has been sealed before
- What the problem is, such as mould, gaps, leaks or cracking
- How we’d reach the joints
To get a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. We will send you a clear quote before any work starts.
Places near Sarratt
Also in Sarratt
Window mastic in Sarratt: local notes
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. With historic houses such as Chenies Manor House (about 1.8 miles west) nearby, there’s older building stock in the area around Sarratt as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
For landlords with property near Chorleywood station, renewing tired window mastic between tenants heads off draught and damp complaints. Managing a site like Sarratt Church of England Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. If you live in an older home near Church of the Holy Cross, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Sarratt is about 3 miles north of Rickmansworth, in Hertfordshire. We carry out window mastic for homes and businesses in Sarratt. We cover 381 towns and villages across Hertfordshire, large and small. There’s also a page for London, about 21 miles away.
We work across the WD3 postcode area for window mastic. That includes homes and businesses on Alexandra Road, Downer Drive and The Briars. Close by, we work in Micklefield Green (1 mile south-east), Bucks Hill (1 mile north-east), Chandler's Cross (2 miles south-east), Loudwater (2 miles south) and Chorleywood West (2 miles south). We also work in nearby towns such as Watford (4 miles east), Hemel Hempstead (5 miles north), St Albans (8 miles north-east), Welwyn Garden City (15 miles north-east), Harpenden (11 miles north-east) and Hatfield (12 miles north-east).
Landmarks near Sarratt
In Sarratt, that means homes and buildings near The Boot Public House and St Clement Danes School. Sarratt’s nearest station is Chorleywood station, about 2.3 miles south-west of the centre. Nearby you will also find Chiltern Open Air Museum (3.8 miles south-west) and Leavesden Hospital (4 miles east). The countryside around Sarratt includes Sarratt Bottom nature reserve and Tumbling Bay.