Hertfordshire · England
Sand Mastic in Chorleywood
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Chorleywood, backed by a 12-month guarantee. Call for a quick quote.
- Failed mastic on an exposed elevation
- Gaps round a timber door in stone or brick
- Draughts and rain around sash boxes
How we quote for sand mastic
Your quote is based on your job. We look at:
- The type of sealant required
- Working hours on commercial sites
- The old material and how stubborn it is
- The number and length of the joints
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
What to tell us for a quote
Before you ask for a quote, have a think about:
- The problem you’ve noticed
- The address or postcode of the job
- Whether it’s a home or a business
- Photos by email, if that’s easy
Need a quote? Please ring 0345 464 0079 or email us and tell us about the job. We will explain what we’d do and give you a clear price before any work starts.
Sand mastic in Chorleywood, 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. We work on period & listed homes, stone surrounds and timber door frames, and the jobs we see most are old cement repairs round a window that have failed and cracked mastic round a front door frame.
Homes around Chorleywood range from older properties to newer houses, and their windows range just as widely. Each frame material needs the right sealant against the right wall.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Chorleywood (WD3)
- Region
- Hertfordshire
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Different surfaces, different methods
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. The method is the same as for windows.
Sash and case windows
Most of our sand mastic work is on sash windows. We renew the mastic round each box.
Also near Chorleywood
More services for Chorleywood
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Landlords and agents in Chorleywood can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Questions from Chorleywood
Can you do sand mastic in Chorleywood?
Yes, Chorleywood is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or email us and let us know what needs doing.
I let a flat near Chorleywood station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
When will the new mastic be hard?
Not straight away. The skin forms first, and the full set comes later, and we’ll tell you what to expect.
Do the sealants smell?
Some sealants have a smell while they cure. Ventilation helps.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us and we’re fully insured.
What exactly is sand mastic?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and shaped to suit the surround.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator and we’re fully insured too.
How do I get a quote for sand mastic in Chorleywood?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Why act early in Chorleywood
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic won’t stop the gaps and traditional guidance is to leave the new mastic unpainted. Homes in smaller places like Chorleywood can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost reflects the work involved, not guesswork. That is why we ask a few questions first and give you a clear quote before any work starts.
What you get with us
- We never seal over old sealant
- Anti-fungal silicone where joints get wet
- 4.9 on Google from 180+ five-star reviews
- Quality sealants from Arbo and Everbuild
Frames and glazing around Chorleywood
Historic houses like Chenies Manor House (about 2.1 miles north-west) are a reminder that the area around Chorleywood has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around Christ Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you let a flat or house near Chorleywood station, older sash windows in a rental need their mastic kept sound to keep the weather out. If you look after a building such as Christ Church Chorleywood CofE School, the mastic around its windows and doors needs looking after like any other building’s.
Chorleywood is about 5 miles west of Watford, in Hertfordshire. Homes, rented property, offices and hotels in Chorleywood can book us for sand mastic, old or new, large or small. The work is guaranteed for a year. Chorleywood is one of 381 towns and villages in Hertfordshire we cover for sand mastic. Our London page covers work nearby (20 miles or so).
All of WD3 is within our area for sand mastic. If you need sand mastic at a property on South Cottage Drive, South Cottage Gardens and South Park Avenue or anywhere close by, our applicators can take on the job. Chorleywood sits on or near the A404, so getting to you is simple. Neighbouring places we cover for sand mastic include Heronsgate (1 mile south-west), Maple Cross (2 miles south), Chenies (2 miles north-west), Horn Hill (2 miles south-west) and West Hyde (3 miles south). Larger places within reach include Watford (5 miles east), Hemel Hempstead (7 miles north), St Albans (10 miles north-east), Harpenden (13 miles north-east), Hatfield (14 miles north-east) and Borehamwood (10 miles east).
Local landmarks in Chorleywood
Around Chorleywood, our work takes us to homes and buildings near St Clement Danes School, Rickmansworth Park and Black Horse Artichoke Dell pub. The nearest railway station is Chorleywood station, roughly 0.7 miles west of the centre. Well-known places in the area include Harefield Hospital (3.2 miles south) and Chiltern Open Air Museum (2 miles south-west). Not far away are Chorleywood Common and Tumbling Bay.
How it works
Once we’re on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours per window, depending on the condition of the joints. A visit to Chorleywood is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Clear items away from the joints we are working on
- Mention if the joints have been sealed before
Ask for a quote
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job, and we’ll come back to you with a quote.
Advice
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Ask a joiner to look at soft timber first
- Don’t paint over the new mastic
- Look over the window mastic once a year
- Ask the planning authority about consent for listed or conservation-area homes
Do not run silicone over the new mastic. If anything cracks, get it looked at rather than patching it.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.