Hampshire · England
Window & door mastic in Lyndhurst, Hampshire
Mastic around window and door frames, sills and patio doors in Lyndhurst, with a 12-month guarantee on every job. Call for a quick quote.
- White mastic on grey or black frames
- Draughty joints inside around the window
- Hard, cracked sealant around windows
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Use gentle cleaners on frames and sealant
- Make sure the drainage slots aren’t blocked
- Keep timber frames painted
- Avoid harsh chemicals near the mastic
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
Signs to watch for: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. Any of these is worth a call.
Window mastic for homes and businesses in Lyndhurst
Around Lyndhurst we seal all kinds of frames: from uPVC casements to timber and aluminium, plus patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. We work on window sills, uPVC windows and composite doors, and the jobs we see most are white mastic on grey or black frames and mastic that has split away from the wall.
Houses in smaller places like Lyndhurst can stand more in the open than those in a built-up town, so exposed windows and doors face the weather head on. That’s hard on the mastic around frames and sills.
A one-year guarantee comes as standard, so you’re not left on your own once the job is done.
- Place
- Lyndhurst (SO43)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Questions from Lyndhurst
Do you work for landlords with property near Ashurst New Forest station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Is Lyndhurst in your area for window mastic?
Yes, Lyndhurst is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator and we’re fully insured too.
Can you do upstairs windows?
Yes, if safe access is possible. For high or awkward windows, we’ll tell you what access is needed.
Do you have insurance?
Yes. We’re fully insured, and we can confirm the details when we quote.
How long does it take to reseal the windows on a house?
The work takes a few hours for a few frames, or a day or more for a whole house. Access and the amount of old mastic make the biggest difference.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures.
Is the new sealant paintable?
Most silicone can’t be painted. Let us know beforehand, and we’ll use a paintable product where it suits.
The process
We keep the work tidy and contained to the area we are working on, so you can carry on as normal. The job usually takes anything from an hour or two to a full day, depending on how many frames there are. For a job in Lyndhurst, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Mention any parking rules near the property
- Move anything stored near the joints
- Tell us about any previous sealing or DIY attempts
How to get a quote
Want a quote for window mastic? Please ring 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
When to call us in Lyndhurst
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the masonry beside it stays put. If the sealant cannot stretch, it splits.
Common reasons people contact us are:
- Rushed sealant from a window installation
- Cold air getting in at the frame edge
- Gaps where the sill meets the wall
- Damp patches on the reveal after heavy rain
If you live in an older home near Church of Our Lady and St Edward, the joint between an old wall and a newer frame is generally the first place rain gets in.
Comparing quotes
- Which sealant they’ll use, and why
- How the colour is chosen
- What happens if the job turns out different
- When the joint can take water or movement
Nearby places to Lyndhurst
Other services in Lyndhurst
Frames and glazing around Lyndhurst
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Ashurst New Forest station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. Managing a site like St Michael and All Angels CofE Infant School? Then the mastic around its windows and doors needs looking after like any other building’s.
Lyndhurst is about 4 miles south-west of Totton, in Hampshire. Jobs in Lyndhurst get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Lyndhurst is one of 683 towns and villages in Hampshire where we work. Our Southampton page covers work nearby.
Here we cover the SO43 postcode area for window mastic. You’ll find streets such as High Street, King's Close and Empress Road, and we cover them all. Neighbouring places we cover for window mastic include Emery Down (1 mile west), Ashurst (3 miles north-east), Balmerlawn (3 miles south), Colbury (4 miles north-east) and Brockenhurst (4 miles south). Further out, we also cover Eastleigh (12 miles north-east), Totton (4 miles north-east), Chandler's Ford (11 miles north-east), Hedge End (12 miles east), Lymington (8 miles south) and Romsey (9 miles north-east).
Local landmarks in Lyndhurst
Typical jobs here are in homes near Fox And Hounds Public House, among other places. The nearest railway station is Ashurst New Forest station, roughly 2.4 miles north-east. Nearby you will also find Ashurst Hospital (2.6 miles north-east) and National Dairy Museum (3.4 miles north-east). Open spaces near Lyndhurst include Copythorne Common.
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, 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.
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Landlords, agents and businesses in Lyndhurst
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Surface by surface
Composite doors
A composite door generally sits in a plastic outer frame, so its perimeter joint is sealed much like a window. We match the colour to the frame.
Patio & French doors
Not every patio door leak is a mastic problem: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We check before we reseal.
What sealant work can’t fix
A few problems are outside what sealant work can do:
- Damp problems in the wall away from the window
- Faulty window hardware
- Soft or decayed wood in the frame
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think.
Where we work in Lyndhurst
- Timber windows & doors
- Patio & French doors
- uPVC windows
- Composite doors
- Aluminium frames
- Window sills