Portsmouth · England
Sand mastic for sash & case windows in Baffins, Portsmouth
Our applicators work in Baffins on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- Silicone on a period window that looks wrong
- Gaps between timber frames and stone or brick
- Draughty sash windows at the surround
How the job changes by surface
Tenement and terrace windows
Windows above ground floor need the right access. Tell us the height and we’ll confirm what’s needed.
Brick reveals
Loose mastic comes out and deep gaps are packed before the new mastic goes in.
How we handle sand mastic in Baffins
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. Typical jobs include wind and rain getting in round a sash window and patchy fillers round a sash window, across stone surrounds, timber door frames and brick reveals.
Around Baffins, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- Baffins (PO3, PO4, PO2)
- Wider area
- Portsmouth
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
When to call us in Baffins
Shallow joints are a common cause. A thin layer doesn’t hold well so we make sure the new mastic is the right thickness.
If you can see any of these, it’s time to have the joints looked at:
- Draughts and rain around sash boxes
- Silicone on a period window that looks wrong
- Gaps round a timber door in stone or brick
- Tired mastic found when preparing windows for paint
For site and facilities teams at buildings such as Langstone Junior Academy, its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- Who does the work, and how experienced they are
- What preparation is included
- Whether the sealant suits the joint
- How long the guarantee is
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Landlords, agents and businesses in Baffins
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
Questions from Baffins
Is Baffins within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Fratton station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before any work starts.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
How much does sand mastic cost in Baffins?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before any work starts.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
How long does sand mastic take to harden?
The surface skins quite quickly and it hardens fully over a longer time. Timing depends on the weather and the joint.
Do you remove the old sealant?
Yes, every time. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Quotes for sand mastic in Baffins
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether old sealant or filler has to be cut out
- Access and height
- The type of sealant required
- Any working-time requirements on site
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will explain what it covers.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- Whether it’s a home or a business
- How many joints, rooms or windows are involved
- Where the property is
- Access, such as stairs, a lift or height
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
Leave it or put it right?
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 smaller place like Baffins, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What you get with us
- We never seal over old sealant
- Sanitary silicone with an anti-fungal additive in wet areas
- More than 20 years in sealant work
- A 12-month guarantee on all work
Windows and doors in Baffins
Baffins is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. With historic houses such as Warblington Castle (about 4.8 miles north-east) nearby, there’s older building stock in the area around Baffins as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Letting a property close to Fratton station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. If you live in an older home near Church of St Cuthbert, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Baffins is about 1 mile east of Portsmouth, in Portsmouth. Jobs in Baffins get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 19 places across Portsmouth, from the larger towns to small villages.
Here we cover the PO3, PO4 and PO2 postcode area for sand mastic. That includes homes and businesses on Byron Road, James Road and Dover Road. With the A288 close by, Baffins is simple for us to get to. We also cover the places around Baffins: Copnor (1 mile north-west), Kingston (1 mile south-west), Fratton (1 mile south-west), Portsmouth (1 mile west) and North End (1 mile north-west). Larger places within reach include Wymering (3 miles north), Paulsgrove (3 miles north-west), Drayton (3 miles north) and Farlington (3 miles north).
Local landmarks in Baffins
Typical jobs here are in homes near The Baffins pub, St Edmund's Catholic School and Alexandra Park and the streets around them. The closest station to Baffins is Fratton station, roughly 1 mile south-west. Well-known places in the area include The Bridge Shopping Centre (1.1 miles south-west) and Southsea Castle (2.4 miles south-west). Open spaces near Baffins include Portsdown Hill and Milton Locks.
Other services in Baffins
How it works
At the end, we look at the finished work together and tell you how long to leave it. The visit itself normally takes anything from a few hours to a full day, depending on how many windows, depending on the size of the job. A visit to Baffins is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- Each surround is checked first.
- 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
- Let us know about parking restrictions
- For business premises, tell us about site rules or sign-in
- Plan for the work area to be out of bounds to pets and children
Getting a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will talk you through the work.