Windsor and Maidenhead · England
Sunninghill Window Mastic
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in Sunninghill. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Gaps where the sill meets the wall
- Cold air getting in at the frame edge
- Cracked internal joints between frame and plaster
Signs you need window mastic in Sunninghill
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. A sealant that can’t keep up eventually tears.
Common reasons people contact us include:
- Old mastic that has gone black or come away
- Rushed sealant from a window installation
- Draughts coming in around windows and doors
- Water coming in at the bottom corners of a door
Rented homes near Ascot station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Comparing quotes
- Are they insured?
- Who does the work, and how experienced they are
- How the joint is cleaned and prepared
- What guarantee comes with the work
Window mastic in Sunninghill
Homes in Sunninghill have every kind of window: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. We work on patio & French doors, timber windows & doors and window sills, and people most often call us about gaps between the frame and the inside reveal and a bead that doesn’t match the frame.
Homes around Sunninghill range from older properties to newer houses, and their windows range just as widely. Each frame material needs the right sealant against the right wall.
Whatever the size of the job, you get the same 12-month guarantee.
- Where
- Sunninghill (SL5)
- Wider area
- Windsor and Maidenhead
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Nearby places to Sunninghill
More services for Sunninghill
The process
There is not much for you to do on the day. Point us to the joints and we will get on with it. The job generally takes a few hours for a handful of frames, longer for a whole house from start to finish. In a smaller place like Sunninghill, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
How to prepare
- Tell us if parking is tricky
- Plan for the work area to be out of bounds to pets and children
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
If you’re in Sunninghill and need window mastic, ring 0345 464 0079 or drop 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.
Advice
Looking after it afterwards
After the cure time, these simple habits help:
- Clean frames with a soft cloth and soapy water
- Air rooms to keep condensation down around windows
- Keep timber frames painted
- Look round the frames every year or so
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.
Questions from Sunninghill
Is Sunninghill in your area for window mastic?
Yes, Sunninghill is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Will you come out to Sunninghill?
Yes, Sunninghill is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Does the work come with a guarantee?
Yes. Our one-year guarantee covers every job, inside or out.
What does window mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we’ll talk you through it.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We do one or both.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses.
Is it worth trying it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Do you work on first-floor windows?
Yes, as long as they can be reached safely. Tell us about access when you get in touch so we can plan the job.
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 seal the frame and let you know about anything else.
Window sills
Where a sill meets brick or render, the ends often crack first. We reseal them so rain can’t run into the wall.
Window mastic in Sunninghill: local notes
With historic houses such as St Leonard's Hill (about 4.6 miles north) nearby, there’s older building stock in the area around Sunninghill as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as Church of St Michael and All Angels, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For site and facilities teams at buildings such as St Michael's CofE Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Sunninghill is about 4 miles east of Bracknell, in Windsor and Maidenhead. Across the SL5 area, we cover window mastic for homes and businesses. Our area takes in 57 places across Windsor and Maidenhead, from the larger towns to small villages. We also work in Reading, about 14 miles from Sunninghill.
We cover every part of the SL5 postcode area for window mastic and the streets around it. Local streets include High Street, London Road and School Road, and we cover them all. Close by, we work in Ascot (1 mile north-west), Beggar's Bush (1 mile east), Cheapside (1 mile north), Blacknest (1 mile east) and North Ascot (2 miles north-west). Within a short drive, we also cover Maidenhead (9 miles north), Windsor (5 miles north), Boyn Hill (8 miles north-west), Cookham (11 miles north), Furze Platt (10 miles north) and Dedworth (5 miles north).
Near you in Sunninghill
Locally, jobs take us to homes and businesses close to St Mary's School, Charters School and Silwood Park. The nearest railway station is Ascot station, roughly 1 mile west. A little further out are Heatherwood Hospital (1.5 miles north-west). Open spaces near Sunninghill include Virginia Water Lake and Gracious Pond.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- A frame that has rotted at the joint
- A sash or casement that won’t close properly
- Condensation trapped between the panes
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Joints and surfaces we work on
- uPVC windows
- Patio & French doors
- Window sills
- Timber windows & doors
- Aluminium frames
- Composite doors
What affects the quote in Sunninghill
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether old sealant or filler has to be cut out
- The number and length of the joints
- When we can work, for business premises
- How many rooms, windows or areas are involved
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Helping us quote
You do not need to know the technical terms. Just tell us:
- Whether it has been sealed before
- The rough size of the job
- How we’d reach the joints
- A few photos by email, if you can
Want a quote for window mastic? Please phone 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.