Oxfordshire · England
Great Western Park Window Mastic
Mastic around window and door frames, sills and patio doors for Great Western Park, backed by a 12-month guarantee. Ask us for a quote.
- Gaps between the frame and the inside reveal
- Leaking joints at the ends of sills
- Untidy mastic left by window fitters
Window mastic in Great Western Park, done properly
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We are fully insured ARBOMaster approved applicators, and we give a one-year guarantee on the work. We work on aluminium frames, patio & French doors and timber windows & doors, and the jobs we see most are mastic that has split away from the wall and draughty joints inside around the window.
Houses in smaller places like Great Western Park can stand more in the open than those in a built-up town. The mastic around frames on those walls tends to age faster.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or email us.
- Location
- Great Western Park (OX11)
- Wider area
- Oxfordshire
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
We bring everything the job needs with us. Once we’ve agreed what’s being done, we protect the area and start. It normally takes a morning for a couple of windows and a door. A visit to Great Western Park is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Try not to wet indoor joints just before the visit
- Clear the area around the work
Ask for a quote
For window mastic in Great Western Park, phone 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before any work starts.
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Nearby places to Great Western Park
Other services in Great Western Park
Why it’s worth doing now in Great Western Park
Draughts and leaks don’t always mean new windows. If the frames and glass are in good order, resealing the joints is often all that is needed. Problems with the glass or gaskets are for a window company, and we’ll say so. In a smaller place like Great Western Park, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
What you get with us
- Over 20 years’ experience
- Colour picked to suit the job
- Anti-fungal sanitary silicone in wet areas
- Trusted Arbo and Everbuild sealants
When something else is needed
We will not take on work that will not last, so here’s what sealant cannot put right:
- Penetrating damp from a failed cavity tray or render
- Draughts through the window seals rather than the frame
- Faulty window hardware
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before you book.
Where we work in Great Western Park
- uPVC windows
- Composite doors
- Window sills
- Patio & French doors
- Timber windows & doors
- Aluminium frames
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
When to call us in Great Western Park
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces never bonded as it should, so it comes away long before its time.
It’s worth asking for a quote if you see:
- Untidy mastic left by window fitters
- Cracked or shrunken mastic around the frame
- Damp patches on the reveal after heavy rain
- Gaps where the sill meets the wall
For site and facilities teams at buildings such as GEMS Didcot Primary Academy, larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- Are they insured?
- Which colour the sealant will be
- Whether they seal over old material or remove it
- Is VAT in the price?
How to look after the new joints
Simple care keeps the joints in good condition. Our advice:
- Clear any debris from frame drain holes
- Keep solvents and bleach off the sealant
- Clean frames with a soft cloth and soapy water
- Avoid blasting the frames with a pressure washer
Clean the frames with mild soapy water, and avoid solvent cleaners on the sealant.
Signs to watch for: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. If you notice one, it’s time to get the joint looked at.
Surface by surface
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so we use a flexible, low-modulus sealant. We match white, brown, anthracite grey and black frames.
Window sills
Sills catch the water running down the glass, so the sill ends and the joint under the frame are vital. Each is cleaned out and resealed.
Common questions in Great Western Park
I let a flat near Didcot Parkway station. Can you help?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll send you a clear quote.
Can you do window mastic in Great Western Park?
Yes. Our work covers London and the South East, and Great Western Park is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Is it messy?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Can you reach windows above the ground floor?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote so we can plan the job.
Can I paint over the new sealant?
Not usually, if it’s silicone. Tell us your decorating plans and we’ll pick a sealant to suit.
Is the work guaranteed?
Yes. Every job comes with our 12-month guarantee, and we are fully insured.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
Frames and glazing around Great Western Park
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Clifton Hampden Manor (about 4.4 miles north-east) nearby, there’s older building stock in the area around Great Western Park 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 an older house near a landmark such as Church of St Matthew, the joint between an old wall and a newer frame is generally the first place rain gets in. For landlords with property near Didcot Parkway station, renewing tired window mastic between tenants heads off draught and damp complaints.
Great Western Park is about 1 mile west of Didcot, in Oxfordshire. We carry out window mastic for homes and businesses in Great Western Park. Our Oxfordshire coverage runs to 443 places, Great Western Park among them. You can also see our page for Oxford, roughly 10 miles from Great Western Park.
We work across the OX11 postcode area for window mastic and the streets around it. Whether your property is on Holly Lane, Maple Road and Slade Road or a nearby road, our applicators can take on the job. Neighbouring places we cover for window mastic include Didcot (1 mile east), Milton (2 miles north-west), Sutton Courtenay (2 miles north), Appleford-on-Thames (3 miles north-east) and Culham (3 miles north). Within a short drive, we also cover Oxford (10 miles north), Abingdon-on-Thames (5 miles north), Wantage (7 miles west), Grove (7 miles west), Faringdon (14 miles west) and Kidlington (15 miles north).
Near you in Great Western Park
Locally, jobs take us to homes and businesses close to The Wheatsheaf pub, UTC Oxfordshire and UTC Oxfordshire and the streets around them. The nearest railway station is Didcot Parkway station, roughly 1.3 miles east. Nearby you will also find Atlas Computer Laboratory (2.8 miles south-west) and Abingdon Community Hospital (4.7 miles north). Open spaces near Great Western Park include Churn Hill and Mowbray Fields.