Essex · England
Runwell Window Mastic
Mastic around window and door frames, sills and patio doors for homes and businesses in Runwell and across Essex. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Draughts coming in around windows and doors
- Rushed sealant from a window installation
- A bead that doesn’t match the frame
What happens on the day
Good joint work is mostly preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes most of a day for a typical house, less for a few frames. Parking around Runwell is normally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- Clear the area around the work
- On commercial sites, let us know about site rules
- Tell us about any previous sealing or DIY attempts
Getting a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
Related advice
How we handle window mastic in Runwell
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. If the draught is through the window seals instead, we will tell you. We work on uPVC windows, timber windows & doors and window sills, and the jobs we see most are mastic that’s falling out in pieces and gaps between the frame and the inside reveal.
Homes around Runwell 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.
Big or small, you get the same 12-month guarantee in Runwell and across Essex.
- Location
- Runwell (SS11)
- Wider area
- Essex
- Guarantee
- A year, on every job
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the job changes by surface
Window sills
Every drop off the glass ends up on the sill, so the joints at each end and underneath matter. They’re cut out and resealed with exterior sealant.
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. We’ll point out any rot we find, as a joiner will need to deal with it.
How to look after the new joints
A little care helps the new joints last. We recommend:
- Do not use solvent cleaners on the joint
- Air rooms to keep condensation down around windows
- Avoid blasting the frames with a pressure washer
- Keep paint and stain on wooden frames in good order
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
Common problems we fix in Runwell
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar didn’t grip properly, and it lets go sooner than it should.
These are the problems we’re asked about most:
- Cracked internal joints between frame and plaster
- Cracked or shrunken mastic around the frame
- Water coming in at the bottom corners of a door
- Old mastic that has gone black or come away
Letting a property close to Wickford station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Comparing quotes
- How long the guarantee is
- What the quote includes, VAT included or not
- Is the old sealant removed completely?
- Who does the work, and how experienced they are
What affects the cost of window mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- Whether there’s mould to deal with
- Any working-time requirements on site
- Which sealant suits the joint
- The amount of work
Combining jobs into one visit is usually more efficient than separate visits. We will send you a clear quote for the lot.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Whether it’s a home or a business
- Pictures of the joints, sent by email
- Any access issues, like height or stairs
- What’s wrong with the joints now
For a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Nearby places to Runwell
What else we do in Runwell
What sealant work can’t fix
Sealant is not the answer to every problem, and we will tell you before work begins. Sealant will not put right:
- A frame that has rotted at the joint
- Penetrating damp from a failed cavity tray or render
- Misting between the panes of a double-glazed unit (that needs a new unit)
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
Joints and surfaces we work on
- Patio & French doors
- Timber windows & doors
- Aluminium frames
- uPVC windows
- Composite doors
- Window sills
Runwell: your questions answered
Do you work for landlords with property near Wickford station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Is Runwell in your area for window mastic?
Yes. We work across London and the South East, and Runwell is part of that. Just phone 0345 464 0079 or email us with a few details of the job.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints, and we clear up when we are done.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Do you take out the old sealant first?
Yes, every time. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Do you have sealant for grey or black windows?
Generally, yes. Tell us the frame colour when you get in touch and we will match it as closely as we can.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll tell you what we’re using.
What does window mastic cost?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Work for landlords, hotels and businesses
We work for landlords and agents as well as homeowners. Sealant work between tenants keeps a property looking cared for.
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured for the work.
Window mastic in Runwell: local notes
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.
Schools such as Runwell Community Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. If you live in an older home near Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Runwell is about 1 mile north of Wickford, in Essex. For window mastic in and around Runwell, please phone 0345 464 0079 or email us for a quick quote. We cover Essex from our Crawley base. Runwell is one of 644 places in Essex we cover for window mastic. Chelmsford is on our list too, about 8 miles from Runwell.
We work across the SS11 postcode area for window mastic. Streets in the area include Church End Lane, Viking Way and Canewdon Gardens. We also cover Wickford (1 mile south), Brock Hill (1 mile north-west), Shotgate (2 miles south-east), Battlesbridge (2 miles east) and South Hanningfield (2 miles north). Further out, we also cover Chelmsford (8 miles north), Basildon (5 miles south-west), Brentwood (9 miles west), Maldon (10 miles north-east), Canvey Island (7 miles south) and Billericay (4 miles west).
Local landmarks in Runwell
We work in homes and buildings around Beauchamps High School and Quart Pot pub and the streets around them. Runwell’s nearest station is Wickford station, about 0.7 miles south-west of the centre. Well-known places in the area include Rayleigh Castle (4.2 miles south-east) and Battlesbridge Motorcycle Museum (1.9 miles east). Not far away are Shotgate Thickets.