Hampshire · England
Window & door mastic in West Liss, Hampshire
Window mastic in West Liss from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Gaps between the frame and the inside reveal
- Mastic that has split away from the wall
- White mastic on grey or black frames
How we quote for window mastic
The quote reflects the job in front of us. We take into account:
- The size of the job
- How many areas need sealing
- Which sealant suits the joint
- Any mould that needs treating
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, call 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- The problem you’ve noticed
- The type of property
- How many joints, rooms or windows are involved
- Photos by email, if that’s easy
Getting a quote is simple: tell us what needs doing and where and its rough size. A few pictures by email make the job easier to understand.
Window mastic for homes and businesses in West Liss
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We are fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. If you have draughts coming in around windows and doors and cracked or shrunken mastic around the frame, we can help, on aluminium frames, uPVC windows and window sills alike.
Somewhere as small as West Liss, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- West Liss (GU33)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Honest limits
In fairness, some problems need a different trade:
- Soft or decayed wood in the frame
- A failed sealed unit that has misted up
- A door that needs adjusting, rehanging or new seals
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before you book.
Joints and surfaces we work on
- Window sills
- Composite doors
- Patio & French doors
- uPVC windows
- Aluminium frames
- Timber windows & doors
What happens on the day
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. It usually takes a few hours for a few frames, or a day or more for a whole house. Somewhere as small as West Liss, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- The surfaces are cleaned and left dry.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Mention any tricky access
- Mention any leaks or damp you’ve noticed
Get a quote
We quote each job on its own, so the first step is telling us about yours. Simply phone 0345 464 0079 or email us and describe the job.
Read more
Also near West Liss
What else we do in West Liss
How the job changes by surface
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so the joint must stay flexible. We seal onto sound, dry paintwork or timber.
When to call us in West Liss
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
Signs it’s time to call us include:
- Gaps where the sill meets the wall
- Cold air getting in at the frame edge
- Gaps between the frame and the inside reveal
- Rain getting in at the frame or under the sill
Letting a property close to Liss station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Before you book anyone
- What happens if the job turns out different
- What guarantee comes with the work
- What insurance they hold
- Whether all the old sealant comes out first
West Liss questions
Can you do window mastic in West Liss?
Yes. Our work covers London and the South East, and West Liss is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Is West Liss within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you work for letting agents?
Yes. Domestic, commercial and hotel work are all part of what we do, and we’re fully insured.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Can new window sealant be painted?
It depends on the sealant. Some hybrid sealants can be painted; silicone can’t. Mention any painting plans before work begins.
Is the work guaranteed?
Yes. Each job is covered for 12 months.
Can you reach windows above the ground floor?
Yes, where it’s safe. Higher or awkward frames may need extra access, and we will confirm what’s needed.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We will tell you what we are using and why.
Windows and doors in West Liss
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near Church of St Mary, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Managing a site like Liss Infant School? Then the mastic around its windows and doors needs looking after like any other building’s.
West Liss is about 3 miles north-east of Petersfield, in Hampshire. We carry out window mastic for homes and businesses in West Liss and nearby. West Liss is one of 683 towns and villages in Hampshire where we work. We also work in Portsmouth, around 18 miles away.
Every address in GU33 is within our area for window mastic, from the main roads to the quietest streets. We cover properties on Syers Road, Willow Road and Inwood Road and the roads around them. We also cover the places around West Liss: Liss (1 mile north-east), Durford Wood (1 mile south), Hill Brow (1 mile south-east), Liss Forest (1 mile north) and The Mint (1 mile north-east). Further out, we also cover Havant (13 miles south), Horndean (10 miles south-west), Aldershot (15 miles north), Alton (8 miles north-west), Waterlooville (12 miles south-west) and Petersfield (3 miles south-west).
Around West Liss
Locally, jobs take us to homes and businesses close to Crossing Gates pub and the streets around them. West Liss has its own railway station: Liss station. Nearby you’ll also find Bear Museum (3.1 miles south-west) and Petersfield Community Hospital (3.2 miles south-west). Not far away are Wheatham Hill and Liss Riverside Railway Walk South.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Keep jet washers away from the mastic
- Do not use solvent cleaners on the joint
- Clean frames with a soft cloth and soapy water
- Air rooms to keep condensation down around windows
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.