South East England and London
Sand Mastic in Portsmouth
Covering 19 places across Portsmouth for sand mastic, with every joint properly prepared, with a clear quote before we start and a one-year guarantee.
Towns we cover in Portsmouth
Traditional burnt sand mastic around sash and case windows and doors in stone and brick. Choose your town from the list to see local details, or get in touch for a quick quote.
Main towns
What else we do in Portsmouth
- Remedial sealant & repairs
- External & façade joints
- Glazing & conservatory sealant
- Commercial & hotel sealant
- Gutter, fascia & soffit sealing
- Regrouting
- Floor & skirting joints
- Fire-rated sealant
- New-build mastic & snagging
- Bathroom & kitchen resealing
- Window & door mastic
Postcode districts
Our sand mastic service in Portsmouth
Traditional burnt sand mastic blends with stone and brick surrounds. It suits period and listed homes, where modern sealant can look out of place. We’re often asked to deal with draughty sash windows at the surround and tired mastic found when preparing windows for paint, across timber door frames, period & listed homes and tenement windows.
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours per window, depending on the condition of the joints.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
What you’ll pay
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- Every job guaranteed for a year
- We are fully insured
- Anti-fungal silicone where joints get wet
Ask for a quote
Getting a quote is simple: let us know what needs doing and where. A few pictures by email make the job easier to understand, and we’ll come back to you with a quote.
Local landmarks in Portsmouth
Around Portsmouth, our work takes us to homes and buildings near Manor Infant School, Alexandra Park and St Wilfrid. Other local landmarks include The Druids Arms (within half a mile north-east), The Portsmouth Academy (under half a mile south-east) and St Edmund's Catholic School (0.7 miles south-west). For rail, the closest station is Fratton station, about 0.9 miles south. Nearby you will also find Royal Portsmouth Hospital (0.7 miles south-west) and Charles Dickens Birthplace Museum (under half a mile west). For a walk, there’s Milton Locks and Portsdown Hill.
Frames and weather across Portsmouth
Homes across Portsmouth range from period properties with timber or sash windows to new builds with uPVC. Walls facing the weather take the most punishment.
London and the South East are among the drier parts of the UK, but outdoor sealant still needs a dry day and clean surfaces, so outside work in Portsmouth is planned around the forecast. Along the coast in Portsmouth, holiday lets and guest houses can have bathrooms in near-constant use, which is hard on sealant and grout, and the weather is hard on the outside too.
Portsmouth: Rented homes near Fratton station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. Managing a site like Manor Infant School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Landlords, agents and businesses in Portsmouth
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
We also work for property managers and facilities teams. We can quote a run of properties together.
Signs you need sand mastic
Timber swells and shrinks with the weather. That movement opens up the mastic joint over time.
Any of these means the joints need attention:
- Weathered mastic on the most exposed windows
- Old sand mastic that has cracked, crumbled or fallen out
- Patchy fillers round a sash window
- Silicone on a period window that looks wrong
Can I do it myself?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Quotes for sand mastic in Portsmouth
Jobs vary more than people expect. The main factors:
- The size of the job
- When we can work, for business premises
- Whether old sealant or filler has to be cut out
- Mould in or behind the old joints
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are not sure whether it needs doing, phone 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Asking for a quote
Before you ask for a quote, have a think about:
- Whether it has been sealed before
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
- The type of property
We quote each job on its own. Just ring 0345 464 0079 or drop us an email with the details.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Get any rot dealt with first
- Go gently near the mastic when preparing windows
- Clear gutters so water does not pour onto the windows
- Look over the window mastic once a year
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
FAQs for Portsmouth
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Can I choose the sealant colour?
Usually, yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before work begins.
Can tenants book the work?
Of course. Check with your landlord; we can send the quote to them too.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Do you work for landlords and businesses?
Yes. Domestic, commercial and hotel work are all part of what we do.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
Do you cover Portsmouth?
Yes. We’re based in Crawley and work across South East England, London and Scotland.