Kent · England
Sand mastic for sash & case windows in Dean Street, Kent
Problem with your window and door surrounds in Dean Street? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Draughty sash windows at the surround
- Open joints round the window box
- Cracked mastic round a front door frame
Sand mastic in Dean Street
Fresh sand mastic forms a skin quite soon, but it takes longer to harden fully. Traditionally, sand mastic is left unpainted and we will advise if you’re redecorating. If you are dealing with draughts and rain around sash boxes and patchy fillers round a sash window, we can help, whatever the surface.
Around Dean Street, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Every job is covered by a 12-month guarantee, wherever you are in Kent.
- Place
- Dean Street (ME15)
- Region
- Kent
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we’re called out for in Dean Street
Shallow joints are a common cause. A thin layer does not hold well so we make sure the new mastic is the right thickness.
Signs it’s time to call us include:
- Cracked mastic round a front door frame
- Failed mastic on an exposed elevation
- Gaps where the frame meets the masonry
- Wind and rain getting in round a sash window
Rented homes near East Farleigh station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
What to look for in a quote
- How much experience the applicator has
- What guarantee comes with the work
- What insurance they hold
- What the cure time is
What we do, step by step
Once we’re on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to a full day, depending on how many windows. In a small place like Dean Street, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling 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
- Mention any parking rules near the property
- Tell us about any previous sealing or DIY attempts
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work.
Advice
Leave it or put it right?
Before painting the windows, it pays to renew the mastic. Painting over failed mastic does not seal it, and the new mastic is traditionally left unpainted. In a small place like Dean Street, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why Dean Street clients choose us
- 12-month guarantee on every job
- Full insurance on every job
- We leave the area clean and tidy
- Arbo and Everbuild products
See our cost guide and what customers say.
What affects the quote in Dean Street
Call for a quick quote. The main things that affect it are:
- The old material and how stubborn it is
- The number and length of the joints
- Which sealant suits the joint
- When we can work, for business premises
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Any access issues, like height or stairs
- The rough size of the job
- Any previous sealing or DIY work
- A few photos by email, if you can
For a quote, ring 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
FAQs for Dean Street
Can you do sand mastic in Dean Street?
Yes. We work across London and the South East, and Dean Street is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing.
Can you help a landlord with a rental near East Farleigh station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Do you guarantee sand mastic work?
All our work has a one-year guarantee.
How long does sand mastic take to harden?
The surface skins quite quickly, then hardens over a longer period. The weather and joint depth both affect it.
How long will you be here?
A typical job takes anything from a few hours to a full day, depending on how many windows, including preparation and clearing up. We’ll confirm how long when we quote.
What does sand mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints, and we clear up when we’re done.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Surface by surface
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
Places near Dean Street
Also in Dean Street
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Look over the window mastic once a year
- Avoid patching sand mastic with silicone
- Don’t paint over the new mastic
- Sort the mastic before the decorators arrive
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
What sand mastic looks like in Dean Street
Historic houses like Stoneacre (about 3.5 miles east) are a reminder that the area around Dean Street 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For site and facilities teams at buildings such as East Farleigh Primary School, the mastic around its windows and doors needs looking after like any other building’s. Homes close to Church of Saint Mary include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Dean Street is about 2 miles south-west of Maidstone, in Kent. Homes, rented property, offices and hotels in Dean Street can book us for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. Across Kent, we cover 922 places, Dean Street among them. For nearby work, see our London page, about 31 miles away.
Here we cover the ME15 postcode area for sand mastic. We cover properties on Forge Lane and Dean Street and the roads around them. We also cover the places around Dean Street: East Farleigh (1 mile west), Coxheath (1 mile south), Fant (1 mile north), Kettle Corner (1 mile west) and Farleigh Green (1 mile west). Within a short drive, we also cover Sittingbourne (12 miles north-east), Sevenoaks (14 miles west), Royal Tunbridge Wells (13 miles south-west), Gravesend (13 miles north), Tonbridge (10 miles west) and Northfleet (14 miles north-west).
Landmarks near Dean Street
Locally, jobs take us to homes and businesses close to Walnut Tree pub, St Augustine Academy and Quarry Wood, among other places. Dean Street’s nearest station is East Farleigh station, about 0.6 miles north-west. Other landmarks nearby include Allington Castle (3 miles north) and Fremlin Walk (2 miles north-east). Green spaces nearby include Boxley Hills.