Oxfordshire · England
Window Mastic in Islip
Window mastic for Islip, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Draughts coming in around windows and doors
- Rain getting in at the frame or under the sill
- Black, perished sealant on frames
Window mastic in Islip: local notes
Historic houses like Holywell Manor (about 4.6 miles south) are a reminder that the area around Islip has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Islip station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Schools such as Dr South's Church of England Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Islip is about 5 miles north of Oxford, in Oxfordshire. For window mastic in and around Islip, please ring 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover Oxfordshire. We cover 443 towns and villages across Oxfordshire.
We work across OX5 for window mastic and the streets around it. If you need window mastic at a property on High Street, King's Head Lane and Middle Way or a nearby road, our applicators can take on the job. Other places close to Islip include Gosford (2 miles south-west), Hampton Poyle (2 miles north-west), Kidlington (2 miles west), Bletchingdon (3 miles north-west) and Weston-on-the-Green (3 miles north). Further out, we also cover Oxford (5 miles south), Didcot (15 miles south), Bicester (6 miles north-east), Abingdon-on-Thames (10 miles south), Witney (11 miles west) and Thame (12 miles south-east).
Landmarks near Islip
Locally, jobs take us to homes and businesses close to The Red Lion Inn and Gosford Hill School and the streets around them. Islip has its own railway station: Islip station. Well-known places in the area include Churchill Hospital (4.1 miles south). Green spaces nearby include Otmoor RSPB reserve and Headington Hill.
How we handle window mastic in Islip
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re ARBOMaster approved and fully insured, and we give a 12-month guarantee on the work. Typical jobs include cracked or shrunken mastic around the frame and cracked internal joints between frame and plaster, on aluminium frames, composite doors and patio & French doors.
In a village or hamlet like Islip, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Place
- Islip (OX5)
- Region
- Oxfordshire
- Cover
- One year on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of window mastic
Every job gets its own quote. This is what makes a difference:
- The number of rooms or windows
- The old material and how stubborn it is
- The amount of work
- Any mould that needs treating
What you pay reflects the work, not a rough estimate. That is why we ask about the job first.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- The type of property
- How we’d reach the joints
- Any previous sealing or DIY work
- Roughly how big the job is
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 add photos by email if you can.
Why deal with it now?
Resealing frames is a short job: it takes anything from an hour or two to a full day, depending on how many frames there are. Leave it until water is coming in and you may need plastering and decorating as well. In a small place like Islip, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
Why book with us
- Domestic, commercial and hotel work
- Over 20 years’ experience
- We never seal over old sealant
- Sealant colour chosen to suit
Take a look at what affects the cost and customer reviews.
The process
We keep the work tidy and contained to the area we’re working on, so you can get on with your day. Expect the work to take anything from an hour or two to a full day, depending on how many frames there are, and we explain the cure time before we leave. In a small place like Islip, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing.
- 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
- Mention if the joints have been sealed before
- Tell us if parking is tricky
- Clear items away from the joints we’re working on
Get a quote
Getting a quote is simple: tell us what needs doing and where. Photos by email help us understand the job.
Related advice
Common questions in Islip
Is Islip in your area for window mastic?
Yes. Our work covers London and the South East, and Islip is part of that. You can call 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear price.
Will you come out to Islip?
Yes, Islip is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
How long will my window job take?
Allow a few hours for a handful of frames, longer for a whole house. Access and how stubborn the old mastic is affect the time most.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
Do you guarantee window mastic?
Yes, with our 12-month guarantee. A yearly look at the joints helps them last.
Can new window sealant be painted?
Not generally, if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
Where is Mr Mastic based?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area.
Nearby places to Islip
Other services in Islip
When something else is needed
Sealant is not the answer to every problem, and we’ll tell you before work begins. It won’t solve:
- A sash or casement that will not close properly
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Soft or decayed wood in the frame
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Composite doors
- Timber windows & doors
- Window sills
- uPVC windows
- Aluminium frames
- Patio & French doors
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Keep solvents and bleach off the sealant
- Clear any debris from frame drain holes
- Use gentle cleaners on frames and sealant
- Repaint timber before it’s bare
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
Landlords, agents and businesses in Islip
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Signs you need window mastic in Islip
On timber frames, paint and putty build up around the joint. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
Any of these means the joints need attention:
- Cracked sealant at the sill ends
- Damp patches on the reveal after heavy rain
- Hard, cracked sealant around windows
- Draughts coming in around windows and doors
In the older streets around St Nicholas' Church, the joint between an old wall and a newer frame is usually the first place rain gets in.
What to look for in a quote
- The length of the guarantee
- Whether VAT is included
- What preparation is included
- Whether the sealant suits the joint