Greater London · England
Pinner Window Mastic
Window mastic for Pinner and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Water coming in at the bottom corners of a door
- Leaking joints at the ends of sills
- Cold air getting in at the frame edge
How to look after the new joints
Aftercare is simple, and it makes a real difference:
- Ventilate rooms so frames do not stay wet inside
- Keep paint off silicone joints
- Check the mastic once a year
- Don’t aim a pressure washer at the joints
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
Window mastic in Pinner
Homes in Pinner have every kind of window: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. If you are dealing with rain getting in at the frame or under the sill and gaps where the sill meets the wall, we can help.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking, and access in Pinner is something to talk through when you book.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Pinner (HA5)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
On the day, there’s very little for you to do. 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. For a job in Pinner, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Preparing for the visit
- On commercial sites, let us know about site rules
- Clear items away from the joints we are working on
- Mention any leaks or damp you’ve noticed
Get a quote
Want a quote for window mastic? Please call 0345 464 0079 or email us and tell us about the job. We will explain what we’d do and send you a clear quote before work begins.
Related advice
Different surfaces, different methods
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the sealant goes in between frame and wall.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A tidy bead in anthracite grey, black or a matching colour suits the frame.
DIY sealant or a professional job?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Landlord and commercial work in Pinner
For anyone letting property in or around Pinner, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Questions from Pinner
Is Pinner in your area for window mastic?
Yes. We work across London and the South East, and Pinner is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
Can parking be tricky for a visit in Pinner?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Can you quote for more than one area?
Yes, we can. More than one area can be quoted together.
How much does window mastic cost in Pinner?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or send us an email and tell us what needs doing and where.
Can you match the sealant to my frames?
Yes. Grey and black frames get grey or black sealant, and wood-effect frames usually suit brown.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
Can tenants book the work?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Can you seal over the old sealant?
No, it will not 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.
Also in Pinner
When it isn’t the sealant
We will not take on work that will not last, so these are the limits:
- Rotten timber, which needs a joiner first
- Broken hinges, locks or handles
- Damp problems in the wall away from the window
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before booking.
What we seal
- Composite doors
- Window sills
- Aluminium frames
- Patio & French doors
- Timber windows & doors
- uPVC windows
Pinner homes and the weather
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book. With historic houses such as Headstone Manor (about 1.5 miles east) nearby, there’s older building stock in the area around Pinner as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Letting a property close to Hatch End station? Then renewing tired window mastic between tenants heads off draught and damp complaints. Pinner is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Pinner is about 1 mile north-east of Ruislip, in Greater London. Pinner gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Pinner is one of 764 towns and villages in Greater London where we work for window mastic. We also work in London, about 14 miles from Pinner.
We cover every part of HA5 for window mastic. Whether your property is on Love Lane, Tudor Road and Marsh Road or anywhere close by, our applicators can take on the job. Other places close to Pinner include Pinner Green (1 mile north-west), Eastcote (1 mile south), North Harrow (1 mile south-east), Roxbourne (1 mile south) and Rayners Lane (2 miles south-east). Further out, we also cover London (14 miles south-east), City of Westminster (12 miles south-east), Marylebone (12 miles south-east), Kensington (10 miles south-east), St Pancras (13 miles east) and Shoreditch (14 miles east).
Local landmarks in Pinner
In Pinner, that means homes and buildings near Pinner High School, Heathfield School and The Oddfellows Arms. Pinner’s nearest station is Hatch End station, about 1.4 miles north-east of the centre. Other landmarks nearby include Northwood and Pinner Cottage Hospital (1.3 miles north-west) and St. George's Shopping Centre (2.3 miles east). Open spaces near Pinner include Horse Shoe Bay and Northala Fields.
Signs you need window mastic in Pinner
Frames are never completely still. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. If the sealant cannot stretch, it splits.
The problems people generally mention when they call are:
- Cracked sealant at the sill ends
- Gaps left after new windows were fitted
- Mastic that has split away from the wall
- Whistling draughts around closed windows
In the older streets around Christian Science Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- Is VAT in the price?
- Who does the work, and how experienced they are
- What preparation is included
- What product goes in the joint