Oxfordshire · England
Window Mastic in Northway
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Northway. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Cold air getting in at the frame edge
- Cracked or shrunken mastic around the frame
- Gaps between the frame and the inside reveal
Window mastic in Northway
Behind a thin line of old mastic there’s sometimes a deep void. Filling it with sealant alone leaves a joint that can’t move properly, so deep gaps get backing rod first. The sealant then grips the two sides it should. We work on uPVC windows, patio & French doors and window sills, and common reasons people get in touch are gaps left after new windows were fitted and cracked internal joints between frame and plaster.
In a smaller place like Northway, some walls face open ground and catch the full force of the weather, so exposed windows and doors face the weather head on. That’s hard on the mastic around frames and sills.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Northway (OX3)
- Wider area
- Oxfordshire
- Cover
- A year, on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Quotes for window mastic in Northway
We quote each job individually. These are the things that affect it:
- Any mould that needs treating
- The amount of work
- When we can work, for business premises
- Whether old sealant or filler has to be cut out
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before any work starts, so you know where you stand.
What we need to know
To help us quote quickly, please include:
- The address or postcode of the job
- Roughly how big the job is
- Any previous sealing or DIY work
- Whether it’s a home or a business
We quote each job on its own, so the first step is telling us about yours. Simply phone 0345 464 0079 or send us an email and describe the job and send photos if you have them.
Towns and villages near Northway
Also in Northway
When it is not the sealant
We will not take on work that won’t last, so these are the limits:
- Condensation trapped between the panes
- Draughts through the window seals rather than the frame
- Penetrating damp from a failed cavity tray or render
If you are not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Window sills
- Composite doors
What we are called out for in Northway
Joint shape matters as much as the product. A skim of sealant over a wide gap soon tears, while a joint packed solid can’t stretch. That’s what backing rod is for.
Signs it’s time to call us include:
- Cold air getting in at the frame edge
- Draughty joints inside around the window
- Mastic that has split away from the wall
- Leaking joints at the ends of sills
If you let a flat or house near Oxford station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Questions to ask before you book
- Which sealant they’ll use, and why
- How much experience the applicator has
- Whether they seal over old material or remove it
- Are they insured?
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
In hotels, rooms out of use cost money, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
Why deal with it now?
Once mastic fails, rain can get between the frame and the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. In a smaller place like Northway, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Combining jobs into one visit is generally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We’ll send you a clear quote for the lot.
What you get with us
- Neat joints and a tidy finish
- Full insurance on every job
- 180+ five-star Google reviews
- 20+ years of sealant experience
Read our cost guide and customer reviews.
Northway homes and the weather
Historic houses like Holywell Manor (about 1.5 miles south-west) are a reminder that the area around Northway 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 is traditional sand mastic. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Homes close to St Anthony of Padua include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Managing a site like New Marston Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Northway is about 1 mile north of Oxford, in Oxfordshire. Our applicators cover window mastic for homes and businesses in Northway and the surrounding area. Northway is one of 443 towns and villages in Oxfordshire we cover.
We cover every part of the OX3 postcode area for window mastic. Whether your property is on Copse Lane, Marsh Lane and Upway Road or anywhere close by, we can help. You will find Northway on the A40, which makes it straightforward to reach. Other places close to Northway include Headington (1 mile south-east), Marston (1 mile north-west), New Marston (1 mile south-west), Headington Hill (1 mile south) and Headington Quarry (1 mile south-east). Larger places within reach include Didcot (11 miles south), Bicester (9 miles north), Abingdon-on-Thames (7 miles south), Witney (12 miles west), Thame (11 miles east) and Wantage (15 miles south-west).
Around Northway
Locally, jobs take us to homes and businesses close to English Faculty Library, Bury Knowle Park and Cheney School and the streets around them. Other local landmarks include Rye St Antony School (0.8 miles south) and White Hart Inn (0.6 miles south-east). Northway’s nearest station is Oxford station, about 2.4 miles south-west. Nearby you’ll also find Churchill Hospital (0.5 miles south) and Oxford Castle (2.2 miles south-west). Open spaces near Northway include Headington Hill and CS Lewis Nature Reserve.
The process
Every visit runs the same way: we look at the joints together, protect the area around them, do the work and tidy away. It usually takes anything from an hour or two to a full day, depending on how many frames there are. A visit to Northway is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Preparing for the visit
- Tell us about any water getting in
- Mention any tricky access
- For business premises, tell us about site rules or sign-in
How to get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few photos by email make the job easier to understand, and we will take it from there.
Advice
How the job changes by surface
uPVC windows
Some uPVC windows were sealed at fitting with a quick bead that never bonded. It comes out, deep gaps get backing rod and the joint is resealed.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal. Neutral-cure sealant is the safe choice.
Questions from Northway
Do you work for landlords with property near Oxford station?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before we start.
Will you come out to Northway?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you do the inside joint as well?
Yes, we do both. Inside, the joint between frame and plaster is sealed neatly.
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.
How much does window mastic cost in Northway?
Every job is different, so each one gets its own quote. For a quick quote, call 0345 464 0079 or email us and tell us what needs doing and where.
Are you insured?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
Can new sealant go over the old?
No, it won’t last. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints, and we clear up when we’re done.