FOR PROFESSIONALS
A product built around the demands of real buildings
Sash Vault is a system built not just for homeowners – but for professionals who need reliability, compliance, and technical performance in one discreet frame.
Whether you’re working on a listed property, a security-conscious residence, or a building that demands bespoke detailing, our patented sash window system delivers architectural integrity and engineered strength in equal measure.
We’re not a general joinery shop. We manufacture and install the only sash window in the UK approved for Grade 2 listed buildings with built-in high security – and we do it to order, with total control over design, production, and fit.
If you’re specifying for a conservation project, designing for high risk, or responding to a brief that leaves no room for compromise – you’re in the right place.
Because you can’t afford to revisit the decision later
Specifying Sash Vault means solving multiple problems at once – without compromising the brief, the look, or the security.
Our sash windows are the only ones in the UK approved for Grade 2 listed buildings that also contain a patented internal stainless steel structure. This core resists crowbar attacks, accepts bulletproof glazing, and supports a patented secure ventilation lock – all while remaining invisible from the outside.
Every unit is fully bespoke, built to your dimensions, sightlines, material requirements and heritage constraints. We offer single and double glazing, conservation-style detailing, and multiple frame configurations. Whether your concern is planning approval, ballistic resistance or refined Georgian profiles – we work with it.
You also get a single point of responsibility: no third-party suppliers, no installer uncertainty, no retrofit confusion. We manage the full process – and we speak the language of your drawings, elevations, and specifications.
If you’re building something that matters, or safeguarding something that can’t be compromised, this is the sash window to specify.
Meets the strictest conservation and listed-building requirements
Working on a listed or conservation-area property comes with strict visual and material constraints – and rightly so. With Sash Vault, you can specify a window system that satisfies both the planning authority and the structural brief.
Our sash windows are the only system in the UK approved for Grade 2 listed buildings while containing high-level internal security. We’ve achieved this by matching every visible detail to period-correct standards:
Planners and conservation officers approve our frames because they look right – even under scrutiny. Meanwhile, clients get the hidden security and performance they actually need.
We offer guidance for heritage consultants, can assist with supporting documentation for listed-building applications, and provide technical detailing that aligns with architectural expectations.
If your project needs to pass planning while performing well beyond ordinary standards – this is the window to use.
Glazing, ventilation, and resistance levels all customisable
We offer a wide range of performance options to meet the needs of security-sensitive, acoustically complex, or planning-constrained projects.
Our window system accepts single or double glazed units, with custom configurations including:
Each unit is fully sealed, tested, and fitted into our patented steel-reinforced timber frames.
Standard on all windows is our patented secure ventilation lock – allowing the sash to remain open in a fixed position without compromising the property’s safety. Ideal for upper-floor bedrooms or urban properties requiring airflow with peace of mind.
Hardware, finishes, locking levels, and visual profiles all can be tailored to your specification. Whether you’re working to thermal performance targets, security ratings, or visual restrictions – we build around those needs, without making you choose between them.
Direct access to our team for technical queries and design feasibility
We don’t just manufacture windows – we collaborate with professionals from the earliest design stages. Whether you’re submitting drawings for planning, preparing tender documentation, or coordinating conservation requirements, we offer practical, responsive support throughout.
Our team can provide:
We work closely with architects, developers, and conservation specialists to ensure that what’s drawn is buildable, approvable, and functional.
And once the specification is confirmed, we don’t hand it off. We manufacture in-house and install with our own trained teams, giving you a single point of contact and a level of continuity that most suppliers simply can’t match.
If your project requires accuracy, clarity, and a partner that can follow through – we’re ready to help.
We take full responsibility from the factory to the façade
Every sash window is installed by our own team – not third-party fitters. This is key to maintaining the performance, precision, and visual quality expected on sensitive or security-critical projects.
Our installation teams are trained in-house to handle heritage buildings, private residences, and complex elevations. They work cleanly, quietly, and with full respect for listed interiors, delicate finishes, and live environments.
We liaise directly with project managers and site supervisors to ensure proper access, scheduling, and protection during the works. And we complete all finishing, sealing, movement checks and lock testing before sign-off.
After installation, our relationship doesn’t end. We provide aftercare guidance, offer ongoing support, and remain available for adjustments or service requests.
With us, installation is not an afterthought – it’s part of the same craftsmanship we build into every frame.
When failure isn’t an option, professionals choose us
Our sash windows have been specified for projects where planning officers, conservation boards, security consultants and high-value homeowners all had something to say – and where all of them had to be satisfied.
From embassies to listed London townhouses, from secure countryside estates to discreet properties in high-risk areas, Sash Vault frames are now protecting some of the UK’s most demanding buildings.
These aren’t theoretical claims. Our product is:
We’re used to working under pressure, on tight programmes, with absolute non-negotiables. That’s where our system – and our process – shine.
If your next project demands more than just a nice-looking frame, we’re ready to deliver what works in the real world.
We provide the detail needed to gain planning and satisfy clients
If you’re working on a project that may require secure sash windows – whether for heritage compliance, private security, or architectural performance – we’re ready to help.
We offer:
Let us know your project requirements, and we’ll advise on the best solution – tailored to the visual, technical, and planning context.
This isn’t just a product. It’s a professional solution – built to meet the real-world demands of buildings that matter.
info@securitysashwindows.co.uk
59 Chalton St
London, NW1 1HY
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