Greater London · England
Pinner Sand Mastic
Sand mastic across Pinner and nearby, with old sealant always removed completely.
- Weathered mastic on the most exposed windows
- A silicone bead on a sash window that spoils the look
- Gaps round a timber door in stone or brick
Why deal with it now?
Before painting the windows, it pays to renew the mastic. Painting over failed mastic doesn’t seal it and traditional guidance is to leave the new mastic unpainted. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Pinner, the repair is bigger than a sealant job.
Doing several joints on one visit is usually more efficient than separate visits. You’ll get one clear quote for the whole job.
What you get with us
- A 12-month guarantee on all work
- Experience in homes, commercial sites and hotels
- 180+ five-star Google reviews
- Sanitary silicone with an anti-fungal additive in wet areas
See what affects the cost and what customers say.
Sand mastic in Pinner, done properly
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. Typical jobs include silicone on a period window that looks wrong and open joints round the window box, on timber door frames, period & listed homes and sash and case windows.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in Pinner.
Whatever the size of the job, you get the same 12-month guarantee in Pinner and across Greater London.
- Where
- Pinner (HA5)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Pinner
Also in Pinner
Do you need sand mastic in Pinner?
Paint, silicone or cement used over old mastic causes problems. They do not suit the joint and we normally remove them.
It’s worth asking for a quote if you see:
- Failed mastic on an exposed elevation
- Gaps between timber frames and stone or brick
- Tired mastic found when preparing windows for paint
- Draughty sash windows at the surround
If you look after a building such as West Lodge Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Comparing quotes
- How the surfaces are prepared before sealing
- What insurance they hold
- Which sealant they’ll use, and why
- Whether VAT is included
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in Pinner and across Greater London. Several sites can be quoted together, and we’re fully insured for the work.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We cut it out and start again.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Common questions in Pinner
Can you help a landlord with a rental near Hatch End station?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Can parking be tricky for a visit in Pinner?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Should I check with the council before work on a listed or conservation-area home?
Speak to your local planning authority before work starts. Sand mastic is often favoured as like for like, but they decide.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can I choose the sealant colour?
Most of the time, yes. We will tell you which colours the right product comes in.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. If you are redecorating the window, ask us first and we will advise.
Looking after it afterwards
To keep the joints looking good and working properly:
- Avoid heavy scraping on the mastic joint
- Clear gutters so water does not pour onto the windows
- Ask us before painting near the mastic
- Ask a joiner to look at soft timber first
Leave the new mastic alone while it firms up. It forms a skin fairly soon but needs longer to fully harden.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
Sand mastic in Pinner: local notes
Historic houses like Headstone Manor (about 1.5 miles east) are a reminder that the area around Pinner 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. 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.
In the older streets around Christian Science Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. 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. If you need sand mastic in Pinner, please phone 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base, Pinner included. Across Greater London, we cover 764 places, and Pinner is one of them. You can also see our page for London, about 14 miles away.
Our applicators cover all of the HA5 postcode area for sand mastic. Streets in the area include Love Lane, Tudor Road and Marsh Road. We also cover the places around Pinner: 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).
What’s near Pinner
Locally, jobs take us to homes and businesses close to Pinner High School, Heathfield School and The Oddfellows Arms. The nearest railway station is Hatch End station, about 1.4 miles north-east of the centre. Nearby you’ll also find Northwood and Pinner Cottage Hospital (1.3 miles north-west) and St. George's Shopping Centre (2.3 miles east). The countryside around Pinner includes Horse Shoe Bay and Northala Fields.
The process
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes anything from a few hours to a full day, depending on how many windows. In Pinner, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Tell us about any water getting in
- Clear the area around the work
- Keep pets and children clear of the area while we work
Ask for a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Advice
What affects the quote in Pinner
We do not publish a price list, because no two jobs are the same. What we look at:
- The old material and how stubborn it is
- The type of sealant required
- Mould in or behind the old joints
- When we can work, for business premises
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or send us an email.
What we need to know
When you call or email, it’s useful to know:
- Whether it’s a home or a business
- A few photos by email, if you can
- Access, such as stairs, a lift or height
- Any previous sealing or DIY work
If you are in Pinner and need sand mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before any work starts.