Kent · England
Sand mastic for sash & case windows in Grubb Street, Kent
Professional sand mastic in and around Grubb Street, with every bit of old sealant taken out first.
- Old cement repairs round a window that have failed
- Mastic round period door frames that has failed
- Weathered mastic on the most exposed windows
Sand mastic in Grubb Street
Sand mastic does not last for ever and gaps open up round the frame. We rake it out and renew it and tidies the surround. If you have tired mastic found when preparing windows for paint and draughts and rain around sash boxes, we can put it right, whatever the surface.
Somewhere as small as Grubb Street, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
There’s a 12-month guarantee on every job.
- Place
- Grubb Street (DA2)
- Wider area
- Kent
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why it’s worth doing now in Grubb Street
Cement-based fillers and modern sealants don’t always suit a period surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. In a small place like Grubb Street, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and give you a clear price before work begins.
Why choose Mr Mastic in Grubb Street
- Fully insured
- Old sealant always removed completely
- More than 20 years in sealant work
- 4.9 on Google from 180+ five-star reviews
Take a look at how sealant jobs are priced or what customers say.
Your questions about sand mastic in Grubb Street
Can you help a landlord with a rental near Longfield station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
Will you come out to Grubb Street?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Which products do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference.
Can old silicone round a sash window be swapped for sand mastic?
Yes, we do this often. All the old silicone is removed first so the mastic can sit properly.
Where are you based?
Mr Mastic is based in Crawley. We cover Grubb Street and the rest of Kent, along with the rest of our area.
Is consent needed for window work on a listed home?
Checking first is sensible. Your local planning authority can say if consent is needed for work on a listed home or in a conservation area.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Landlords, agents and businesses in Grubb Street
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
What sealant work can’t fix
It helps to know what we cannot do too:
- Crumbling stone or brickwork round the window
- Sash cords, weights and draught-proofing of the sashes
- Broken panes
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before you book.
Where we work in Grubb Street
- Sash and case windows
- Tenement windows
- Brick reveals
- Timber door frames
- Stone surrounds
- Period & listed homes
The process
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes a few hours per window, depending on the condition of the joints from start to finish. Somewhere like Grubb Street needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Preparing for the visit
- On commercial sites, let us know about site rules
- Keep pets and children clear of the area while we work
- Move anything stored near the joints
Ask for a quote
Want a quote for sand mastic? Please ring 0345 464 0079 or send us an email with a few details. We will explain what we’d do and give you a clear quote before we start.
Related advice
Aftercare tips
After the cure time, these simple habits help:
- Get any rot dealt with first
- Plan mastic work ahead of painting
- Keep sills and gutters clear so water drains away
- Find out about consent before window work on a listed home
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at rather than patching it.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
Frames and glazing around Grubb Street
With historic houses such as Lullingstone Castle (about 5 miles south-west) nearby, there’s older building stock in the area around Grubb Street as well as newer homes. 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as Greenlands Primary School, its window and door frames need their mastic kept sound, just like a home’s. In the older streets around Church of Saint Mary Magdalene, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Rented homes near Longfield station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Grubb Street is about 3 miles south-west of Northfleet, in Kent. From the centre of Grubb Street to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our area takes in 922 places across Kent, from the larger towns to small villages. For nearby work, see our London page.
Every address in DA2 is covered for sand mastic, from the main roads to the quietest streets. If you are just outside Grubb Street, we cover Green Street Green (1 mile north), Westwood (1 mile north-east), St Margarets (1 mile west), South Darenth (1 mile west) and Bean (1 mile north). Further out, we also cover Maidstone (14 miles south-east), Dartford (4 miles north-west), Sevenoaks (10 miles south-west), Gravesend (5 miles north-east), Tonbridge (14 miles south) and Northfleet (3 miles north-east).
Landmarks near Grubb Street
Locally, jobs take us to homes and businesses close to Longfield Chalk Bank, Railway Tavern and Longfield Academy. The closest station to Grubb Street is Longfield station, roughly 1 mile south-east of the centre. A little further out are Stone Castle (2.6 miles north) and Darent Valley Hospital (2.3 miles north-west). For a walk, there’s Sawyers Lake.
How the job changes by surface
Tenement and terrace windows
Upper-floor windows need access planning. Tell us the height and we will confirm what’s needed.
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
Places near Grubb Street
What else we do in Grubb Street
DIY versus a professional finish
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 fails, we can still redo it.
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.