Greater London · England
Sand Mastic in Neasden
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Neasden, backed by a one-year guarantee. Ask us for a quote.
- Cracked mastic round a front door frame
- Open joints round the window box
- Crumbling sand mastic round a window
Sand mastic for homes and businesses in Neasden
On many period windows, sand mastic looks right and suits the building. Newer frames normally get a flexible sealant instead, and we’ll talk through which suits your home. Typical jobs include window mastic to renew ahead of painting and old cement repairs round a window that have failed, across sash and case windows, tenement windows and brick reveals.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- Neasden (NW10, NW2, NW9)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Honest limits
We won’t take on work that won’t last, so here’s what sealant cannot put right:
- Cracked or broken glass
- Decayed frames that need repair
- Sashes that need overhauling
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Surfaces we seal
- Period & listed homes
- Timber door frames
- Sash and case windows
- Brick reveals
- Stone surrounds
- Tenement windows
What the job involves on each surface
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. If your home is listed, ask your local planning authority about consent.
DIY sealant or a professional job?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
How the visit works
We work through the job in order: protect, prepare, seal, tidy. Typically it takes anything from a few hours to a full day, depending on how many windows, and the area is left clean. In Neasden, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Mention any parking rules near the property
- Plan for the work area to be out of bounds to pets and children
- Try not to wet indoor joints just before the visit
Ask for a quote
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we will come back to you with a quote.
Related advice
Aftercare tips
Looking after new joints is easy:
- Keep sills and gutters clear so water drains away
- Renew mastic before redecorating the windows
- Look over the window mastic once a year
- Avoid patching sand mastic with silicone
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
An open joint round the box lets weather through. Left, the gap tends to get bigger.
Frames and glazing around Neasden
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Fenton House (about 2.9 miles east) are a reminder that the area around Neasden 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.
Letting a property close to Brent Cross West station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. In the older streets around St Catherine's Church Neasden with St Paul, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For site and facilities teams at buildings such as Northview Junior and Infant School, larger buildings have plenty of frames, and the mastic around each one ages.
Neasden is about 5 miles north-west of City of Westminster, in Greater London. Our applicators cover sand mastic for householders, landlords and businesses in Neasden and the surrounding area. We cover 764 towns and villages across Greater London. For nearby work, see our London page (8 miles or so).
Jobs for sand mastic in NW10, NW2 and NW9 works the same way as everywhere else we cover. Sand mastic is available to properties on Dog Lane, High Road and Ilex Road. If you are just outside Neasden, we cover Brent Park (1 mile west), Church End (1 mile south), Willesden (1 mile south-east), Dollis Hill (1 mile north-east) and Willesden Green (1 mile south-east). Within a short drive, we also cover London (8 miles south-east), City of Westminster (5 miles south-east), Marylebone (5 miles south-east), Kensington (4 miles south-east), St Pancras (6 miles east) and Shoreditch (8 miles east).
Local landmarks in Neasden
Locally, jobs take us to homes and businesses close to Gladstone Park, The Swaminarayan School and Crest Boys' Academy and the streets around them. Neasden’s nearest station is Brent Cross West station, about 1.3 miles north-east. Nearby you’ll also find Neasden Hospital (0.7 miles south-west) and London Designer Outlet (1.7 miles west). The countryside around Neasden includes Westbere Copse and Castlebar Hill.
Also near Neasden
More services for Neasden
Leave it or put it right?
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic is the traditional material and finishes neatly against the masonry. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole 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. Ask us for a quote and we will go through it with you.
Why us?
- Approved under the ARBOMaster scheme
- Domestic, commercial and hotel work
- Old sealant always removed completely
- 12-month guarantee on every job
Common questions in Neasden
Is parking an issue for sand mastic in Neasden?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Do you work for landlords with property near Brent Cross West station?
Yes. We work for landlords and letting agents as well as householders. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
Is consent needed for window work on a listed home?
Yes, it’s worth checking. Ask your local planning authority whether consent is needed for work on a listed home or in a conservation area.
Do the sealants smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
Do I need to be at home?
It depends on the job. For work indoors, someone needs to let us in.
Is it messy?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Quotes for sand mastic in Neasden
There’s no set price list, because jobs vary so much. What we look at:
- Which sealant suits the joint
- The size of the job
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Whether it has been sealed before
- Pictures of the joints, sent by email
- Roughly how big the job is
- Any access issues, like height or stairs
To get a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We’ll send you a clear quote before any work starts.