01Glass-to-glass joints
Structural Glass Roofs
Frameless glass roofs where the glass itself carries the load — over extensions, atria, links and lightwells.
Sealed with structural silicone
Structural glass, engineered and installed by one team — from Surbiton, across London and the Home Counties.
Structural glass specialists
When the glass is the structure, the details decide everything.
Roofs, walls, walk-on floors, extensions and façades where the glass carries the load. We engineer the assembly, calculate the movement and install it with our own teams.
Accredited & approved
FENSAGGF MemberConstructionlineCABSSIPRIBA CPD ProviderNBS SourceISO 9001
Why it is different
A glass floor carries people. It does not get to move.
Remove the frame and the glass becomes the beam, the fin and the restraint all at once. That changes what governs the design. Strength is rarely the problem — movement is. A roof that carries the load but flexes visibly reads as unsafe to everyone standing underneath, which is why deflection is calculated before anything is drawn.
Overhead, every pane is heat-soak tested laminate so a breakage stays in the glass. Where people walk, the assembly keeps its capacity after one ply fails. Those are not sales points; they are the tests the work is verified against.
Design
In house
Install
Own teams
Cover
London & Home Counties
Walk-on panels are laminated and keep their capacity after one ply fails. Before a pane is ordered, the bearings, edge cover and perimeter restraint are already set out — so the floor reads as one still surface, whether you stand on it or look up through it.
Six systems
Every one of them structural glass.
Not a frame with glass in it. In each of these the glass carries the load — and each one fails or succeeds on the same thing: how the load reaches the structure.
02Barrier load
Structural Glass Walls
Frameless glass walls for internal and external use — butt-jointed or fin-supported, with no visible frame.
0.36 kN/m domestic, 0.74 kN/m light duty, 3.0 kN/m for areas with crowd pressure (BS 6180)
03Floor loading
Walk-on Glass Floors
Walk-on and walk-over glass floors and pavement lights, internal and external, engineered to carry people.
Typically 1.5 kN/m² domestic to 5.0 kN/m² for commercial and crowd areas
04Typical size
Structural Glass Extensions
Glass box extensions where the walls and roof work together as one engineered structure.
12m² to 80m²; larger schemes are split into structurally independent bays
05Wind design
Structural Glass Facades
Frameless and minimal-frame façades, entrance screens and full-height glazed elevations.
To BS EN 1991-1-4 with site exposure, altitude and height factors applied
06Sightlines
Frameless Glazed Windows
Frameless and ultra-slim fixed glazing, flush windows and minimal-sightline openings.
From around 21mm on the slimmest sliding systems; frameless fixed glazing has no vertical sightline
Featured project
A glass link between Grade II listed offices and a new commercial building.
A Grade II listed office building and its new commercial neighbour, joined by a link with no frame anywhere in it. The roof is carried on laminated glass beams, the walls are braced by vertical glass fins, and every fixing is concealed so the connection reads as glass and nothing else.
Working between a listed building and a new one meant engineering the junction instead of applying a standard detail: the link absorbs movement from both structures without loading the historic fabric, meets the thermal line of the new building, and was fully set out before anything was ordered.
- Location
- London
- Structure
- Glass beams and fins
- Setting
- Grade II listed offices
Selected work
Built, sealed, walked on.
SurreyStructural Glass Roofs · Structural Glass Walls
Frameless glass roof over a courtyard kitchen
A rear extension wrapped on three sides in frameless structural glass, with a glass-beam roof spanning the kitchen. Low-iron glass throughout so the elevation and soffit read as one uninterrupted plane.
Kensington & ChelseaWalk-On Glass Floors
Walk-on glass floor over a basement family room
A 25.5mm laminated walk-on floor set into a stone floor finish, drawing daylight down to a lower ground living space without losing the ground-floor layout above.
Surrey HillsStructural Glass Walls · Structural Glass Roofs
Glass box extension with an invisible corner
A glass box projecting into the garden, with a glass-to-glass corner and a structural glass roof carried on glass fins. No visible frame on any elevation.
TwickenhamBespoke Rooflights
Automated rooflight over a central stairwell
A made-to-measure opening rooflight in a thermally broken aluminium frame, with rain and wind sensors and remote control, bringing daylight into the core of a Victorian terrace.
Downloads
Take the technical detail away with you.
Specification guidance, indicative cost ranges and our CPD outline — written for architects, contractors and clients who want the numbers before the meeting.
Enquire
Tell us about the opening.
A drawing, a photograph or a sketch is enough to start. Single rooflight or fully glazed elevation, the first conversation is free.
What happens next
- 01We reply within one working day, usually with a couple of questions about the site and the drawing.
- 02We arrange a site visit or a design review, and tell you honestly what is achievable.
- 03You receive an indicative cost range and a realistic programme, with no obligation.
We work across London and the Home Counties. Further afield, call us anyway — we will tell you straight away whether we are the right contractor for it.
Reviews
What clients say after the work is done.
ABAlison Burton
Absolutely delighted with our recent purchase of sliding doors for our new orangery, part of a major renovation of our home. The quality is top-notch, and the sleek design will perfectly complement our…
JTJames Trinder
Minimal Frames have been outstanding throughout the process, from planning to install and aftercare. At all times their communication has been top-notch; fast and effective. Quality of…
NHNarmina Hasanova
Bob and his team have taken on our tricky glass extension installation, embraced its complexity and delivered it to perfection. It truly is a stunning addition to the house. The team that worked on…
ERElliott Raggio
I am pleased to say that overall, I am delighted with the honorable customer service from Robert the company director at Minimal Frame Projects. Thank you to the surveyor and installation team…
BFBruce Fraser
Ultimately an excellent result. Great product. Bob, Mollie and the team worked hard at solving problems and timing. We appreciated their effort and approach.
GBG B
Bob and Minimal Frame have stepped in to help sort out problems with another glazing company. He has kept us well informed throughout and has worked tirelessly to deal with the manufacture…