Greater London · England
Sand Mastic in Upper Holloway
Specialist sand mastic for Upper Holloway: careful preparation, the right product and tidy work. Call for a quick quote.
- Open joints round the window box
- Draughty sash windows at the surround
- Modern sealant on a period surround
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote.
Hotels need rooms back in use, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
About our sand mastic in Upper Holloway
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It suits period and listed homes, where modern sealant can look out of place. We are often asked to deal with cement or filler used on old window joints that has cracked and silicone on a period window that looks wrong, on brick reveals, sash and case windows and period & listed homes.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
Your job is guaranteed for a year, as with all our work.
- Where
- Upper Holloway (N19, N7, N6)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Surface by surface
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It gives a traditional finish.
Also near Upper Holloway
What else we do in Upper Holloway
Your questions about sand mastic in Upper Holloway
Do you work for landlords with property near Upper Holloway station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Is parking a problem for a job in Upper Holloway?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Where do you work from?
We are based in Crawley, West Sussex, and we work across South East England, London and Scotland.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
How long will you be here?
It depends on the size of the job, but most jobs take a few hours for a single window, longer for several. We’ll tell you when we quote.
Can old silicone round a sash window be swapped for sand mastic?
In most cases. The silicone is cut out and the joint cleaned before the sand mastic goes in.
What do you put in the joint?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
How it works
Most of a good job is in the preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours per window, depending on the condition of the joints. In Upper Holloway, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Mention any parking rules near the property
- Tell us about any previous sealing or DIY attempts
- Keep children and pets away from the work area
Ask for a quote
We do not publish a price list. Instead, we give you a clear price for your job. To get started, phone 0345 464 0079 or email us.
Related advice
What happens if it’s left?
Filling over old, loose mastic does not last. Raking out and preparing the joint gives it a sound base so the new mastic stays put. In a flat in Upper Holloway, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
Why book with us
- Any old sealant cut out fully, not covered over
- Tidy, careful work
- ARBOMaster approved applicator
- Sanitary silicone with an anti-fungal additive in wet areas
Take a look at what affects the cost and customer reviews.
What sealant work cannot fix
We’ll always be straight with you, so here’s what new sealant will not do:
- Decayed frames that need repair
- Broken panes
- Damaged stone surrounds
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Brick reveals
- Sash and case windows
- Period & listed homes
- Timber door frames
- Tenement windows
- Stone surrounds
Quotes for sand mastic in Upper Holloway
Your quote is based on your job. We take into account:
- Any mould that needs treating
- How much there is to do
- Access and height
- Which sealant suits the joint
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Asking for a quote
To help us quote quickly, please include:
- How many joints, rooms or windows are involved
- Pictures of the joints, sent by email
- Where the job is, and your postcode
- What the problem is, such as mould, gaps, leaks or cracking
For sand mastic in Upper Holloway, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before any work starts.
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Frames and glazing around Upper Holloway
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
As a London address, Upper Holloway can be tricky for parking: let us know about parking bays, permits or a driveway. For an older house near a landmark such as St Andrew's Whitehall Park, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you let a flat or house near Upper Holloway station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Upper Holloway is about 2 miles east of Hampstead, in Greater London. Anywhere in N19, we cover sand mastic for homes and businesses. Upper Holloway is one of 764 towns and villages in Greater London we cover for sand mastic.
All of N19, N7 and N6 is covered for sand mastic. You will find streets such as Ward Road, Kiver Road and Foxham Road, and we cover them all. Upper Holloway is on the A103, which makes it straightforward to reach. Neighbouring places we cover for sand mastic include Tufnell Park (1 mile south), Dartmouth Park (1 mile south-west), Highgate (1 mile north-west), Nag's Head (1 mile south-east) and Holloway (1 mile south-east). We also work in nearby towns such as London (5 miles south), City of Westminster (4 miles south), Marylebone (3 miles south), Kensington (5 miles south-west), St Pancras (3 miles south) and Shoreditch (4 miles south-east).
Near you in Upper Holloway
Locally, jobs take us to homes and businesses close to City of London Academy, Whittington Park and The Mother Red Cap pub. Other local landmarks include Asanté Academy of Chinese Medicine (1.2 miles north-west) and Vaughan Williams Memorial Library (2 miles south). There’s a railway station in Upper Holloway itself: Upper Holloway station. A little further out are The Mall Wood Green (2.3 miles north-east) and Royal Northern Hospital (0.5 miles south-east). For a walk, there’s Dartmouth Park Hill and Parkland Walk.