Greater London · England
Sand Mastic in Primrose Hill
Problem with your window and door surrounds in Primrose Hill? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Cracked mastic round a front door frame
- Draughty sash windows at the surround
- Old cement repairs round a window that have failed
Sand mastic for homes and businesses in Primrose Hill
Silicone on a period window often looks wrong and does not suit the building. Sand mastic is the traditional choice, and we can replace one with the other. We work on timber door frames, tenement windows and stone surrounds, and people most often call us about mastic worn away on windows facing the weather and gaps round a timber door in stone or brick.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Primrose Hill.
There’s a 12-month guarantee on every job.
- Place
- Primrose Hill (NW3, NW1, NW8)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Why deal with it now?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and blends with the stone or brick. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Why Primrose Hill customers choose us
- Domestic, commercial and hotel work
- We never seal over old sealant
- Anti-fungal silicone where joints get wet
- Over 20 years’ experience
Take a look at our cost guide and our reviews.
Quotes for sand mastic in Primrose Hill
Your quote is based on your job. We look at:
- Access and height
- Working hours on commercial sites
- How many rooms, windows or areas are involved
- The old material and how stubborn it is
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or drop us an email.
What to tell us for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Where the job is, and your postcode
- Roughly how big the job is
- How we’d reach the joints
- Whether it’s a home or a business
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or email us with the details and send photos if you have them.
For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works.
We also work for property managers and facilities teams in Primrose Hill and across Greater London. We can quote a run of properties together.
Sand mastic in Primrose Hill: local notes
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. 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.
Primrose Hill is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. For an older house near a landmark such as Church of St Mary the Virgin, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For site and facilities teams at buildings such as St Paul's Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Primrose Hill is about 1 mile south-east of Hampstead, in Greater London. If you need sand mastic in Primrose Hill, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We’re based in Crawley and cover Greater London, Primrose Hill included. Primrose Hill is one of 764 places in Greater London we cover.
All of NW3, NW1 and NW8 is covered for sand mastic, from the main roads to the quietest streets. If you need sand mastic at a property on Eton Road, Oval Road and Regal Lane or anywhere close by, we can help. You’ll find Primrose Hill on the A5205, which makes it straightforward to reach. Close by, we work in Haverstock (1 mile north), Belsize Park (1 mile north), Chalk Farm (1 mile north-east), South Hampstead (1 mile west) and Swiss Cottage (1 mile west). Within a short drive, we also cover London (4 miles south-east), Kensington (3 miles south-west), Shoreditch (4 miles east), Walthamstow (7 miles north-east), Hoxton (3 miles east) and Whitechapel (4 miles south-east).
Landmarks near Primrose Hill
Locally, jobs take us to homes and businesses close to Cecil Sharp House, Haverstock School and Regent's Park. Also close by are St. Mary's Town and Country School (0.5 miles north-west) and Princess of Wales pub (less than half a mile east). For rail, the closest station is Kentish Town West station, about 0.7 miles north-east. Other landmarks nearby include Montfichet's Tower (3.1 miles south-east) and Wellington Hospital (0.7 miles south-west). Green spaces nearby include Parliament Hill and Adelaide Nature Reserve.
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Don’t run silicone over sand mastic
- Go gently near the mastic when preparing windows
- Get any rot dealt with first
- Inspect the joints round the windows every year or so
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Towns and villages near Primrose Hill
Also in Primrose Hill
Surface by surface
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
Timber door frames
Round a period front door, sand mastic gives the right look.
FAQs for Primrose Hill
Do you work for landlords with property near Kentish Town West station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Is parking an issue for sand mastic in Primrose Hill?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we are done.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first.
Do you offer different sealant colours?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We will tell you what we are using and why.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
How the visit works
When we arrive, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before we start. Most jobs take a few hours for a single window, longer for several. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- We check the window surrounds and agree which joints need renewing.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Let us know about stairs, lifts or work at height
- Let us know if you’ve seen damp or leaks
- Keep pets and children clear of the area while we work
Getting a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.