Windsor and Maidenhead · England
Window Mastic in Cookham Dean
Professional window mastic in and around Cookham Dean, with every bit of old sealant taken out first.
- Rain getting in at the frame or under the sill
- A bead that does not match the frame
- Gaps left after new windows were fitted
How we handle window mastic in Cookham Dean
Homes in Cookham Dean have every kind of window: uPVC, aluminium, timber and composite, plus patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. We work on timber windows & doors, uPVC windows and aluminium frames, and common reasons people get in touch are old mastic that has gone black or come away and sealant in the wrong colour for the frame.
In a village or hamlet like Cookham Dean, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
Our work is backed for twelve months.
- Place
- Cookham Dean (SL6)
- Region
- Windsor and Maidenhead
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
You don’t need to clear the whole room or building before we come, just the space around the work. Everything nearby is protected, and the job takes most of a day for a typical house, less for a few frames for a typical job. Somewhere like Cookham Dean needs a little journey planning: 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.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away.
- The surfaces are cleaned and left dry.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Move anything stored near the joints
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
Get a quote
For a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. We will give you a clear price before any work starts.
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Nearby places to Cookham Dean
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What happens if it’s left?
Not every sealant suits a window. Interior caulk and bathroom silicone are not made for exterior frame joints. An exterior, low-modulus sealant stays flexible in sun and frost. Around Cookham Dean, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
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.
Why us?
- Sealant colour chosen to suit
- White, clear, grey or another colour, product permitting
- Full insurance on every job
- Trusted Arbo and Everbuild sealants
Take a look at our cost guide or what customers say.
How the job changes by surface
Timber windows & doors
Timber moves with moisture as well as heat, so a flexible sealant is essential. We seal onto sound, dry paintwork or timber.
Composite doors
A composite door normally sits in a plastic outer frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Cookham Dean homes and the weather
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 Cliveden (about 2.5 miles east) are a reminder that the area around Cookham Dean 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.
Rented homes near Cookham station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. For site and facilities teams at buildings such as Cookham Dean CofE Primary School, larger buildings have plenty of frames, and the mastic around each one ages. Homes close to Church of St John the Baptist include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Cookham Dean is about 2 miles south-east of Marlow, in Windsor and Maidenhead. Anywhere in SL6, we can carry out window mastic at your property. Cookham Dean is one of 57 towns and villages in Windsor and Maidenhead where we work. For nearby work, see our Reading page.
Jobs for window mastic in SL6 is quoted and booked the same way as anywhere else. Whether your property is on Kings Lane, Popes Lane and Hills Lane or anywhere close by, our applicators can take on the job. Nearby, we also carry out window mastic in Cookham (1 mile east), Bisham (1 mile west), Furze Platt (2 miles south), Marlow (2 miles north-west) and Temple (2 miles west). Further out, we also cover Maidenhead (3 miles south), Windsor (7 miles south-east), Boyn Hill (3 miles south), North Ascot (10 miles south), Dedworth (7 miles south-east) and Broomhall (12 miles south-east).
Around Cookham Dean
Typical jobs here are in homes near Jolly Farmer pub and Furze Platt Senior School and the streets around them. The nearest railway station is Cookham station, about 1 mile east. Other landmarks nearby include Marlow Community Hospital (1.6 miles north-west) and Marlow Museum (1.5 miles north-west). For a walk, there’s Taplow Lake and Carpenter's Wood.
Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Look round the frames every year or so
- Air rooms to keep condensation down around windows
- Repaint timber before it’s bare
- Wash the frames with mild soapy water
Check the drainage slots in the frames aren’t blocked, so rain drains out rather than building up at the sealant.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Sorting cracked mastic early means the joint is sound before the bad weather.
When it isn’t the sealant
A few problems are outside what sealant work can do:
- Damp problems in the wall away from the window
- Draughts through the window seals rather than the frame
- Rotten timber, which needs a joiner first
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
What we seal
- Timber windows & doors
- Window sills
- Patio & French doors
- uPVC windows
- Aluminium frames
- Composite doors
Questions from Cookham Dean
Is Cookham Dean within the area you cover?
Yes. Cookham Dean is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover Cookham Dean for window mastic?
Yes, Cookham Dean is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear quote.
How long does it take to reseal the windows on a house?
That depends on the number of frames, how they’re reached and the state of the old mastic. We will tell you how long your job needs when we quote.
Do you hold any approvals?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Cookham Dean, along with the rest of our area.
How much does window mastic cost in Cookham Dean?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You will get a clear quote before work begins.
I rent my home. Can I book you?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Can you do several jobs on one visit?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Landlords, agents and businesses in Cookham Dean
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.