Search for “Gym Box 6×5” and you land on pages quoting prices lifted from three-year-old catalogues, or numbers rounded “to the nearest twenty grand” with no reasoning behind them. That’s not much help when you’re planning a real investment.
Below is a breakdown of two genuine enquiries from the first quarter of 2026 — a private home gym and a holiday resort. Both for the 6×5 m footprint (30 m²). Both quoted by Gym Assistance. Figures are converted to GBP and reflect delivery to the UK.
Why 6×5 rather than the catalogue 8×3?
The standard catalogue sizes are 8×3, 9×3 and 6×5 — in other words, fairly narrow, long modules. But the customers behind real enquiries increasingly choose proportions closer to a square: 6×5 m, 6×6 m, 8×4 m.
WHY? Because a plot is rarely a long strip of land. Because the owner wants to lay the space out differently — a free-weights zone along one wall and a cardio zone opposite, rather than a training “corridor”. Because 30 m² in a 6×5 layout gives you far more usable floor than 30 m² stretched out at 10×3.
A Gym Box can be ordered in practically any dimension — the price difference comes from floor area and design complexity, not from a surcharge for being “non-standard”.
Quote 1 — private home gym, 6×5 m
Context: private client, own property, a Finnish sauna planned as a partitioned zone within the module. Brief: multi-function equipment, free weights, a warm-up area. Colour: RAL 7016 anthracite. Single-pitch roof.
Cost breakdown
| Item | Cost |
|---|---|
| Steel module 6×5 m (frame, cladding, roof) | from £11,000–13,000 |
| Insulation, wall and ceiling linings | from £1,600–2,000 |
| Corner windows + sliding doors | from £1,200–1,800 |
| Electrical install, LED lighting | from £800–1,200 |
| Air conditioning (3.5 kW split) | from £900–1,200 |
| Rubber flooring, 30 m² | from £700–1,000 |
| Equipment (rack, free weights, cardio, accessories) | from £4,000–6,000 |
| Delivery and installation | from £800–1,400 |
| Total | from £21,000–28,000 |
The specific quote for this enquiry: from £26,000–28,000 with a higher-spec fit-out (electric treadmill, multi-function cable rack, dumbbell set 2–40 kg). Without the sauna — that was earmarked as a separate phase or a module extension.
What’s included in that figure?
➜ A turnkey module ready to use — walk in and train
➜ Heating-and-cooling air conditioning (usable year-round)
➜ Dimmable LED lighting
➜ 15 mm rubber flooring across the whole footprint
➜ Equipment matched to strength-and-functional training for 1–2 people
What’s not included?
➜ Foundation or hardstanding (concrete pads or a slab: from £800–2,500, depending on ground conditions)
➜ The electrical supply to the module (if there isn’t one nearby — an extra cost from your electrician)
➜ The sauna (if planned — see our Train & Recover sauna configuration)
Quote 2 — holiday resort, 6×5 m for guests
Context: a resort offering a guest gym as part of the stay. Requirements: aesthetics consistent with the site’s architecture, corner glazing (a view over the garden/pool), and equipment for irregular users (guests, not athletes). Colour: RAL 7016. Installation spring 2026.
This case differs from a private gym on one key point: the equipment has to survive years of use by hundreds of different people, with no daily supervision. That changes the choice of kit and materials.
Cost breakdown
| Item | Cost |
|---|---|
| Steel module 6×5 m with corner glazing | from £13,000–15,000 |
| Insulation, interior finish (commercial standard) | from £2,000–2,600 |
| Panoramic glass doors + corner windows | from £1,800–2,400 |
| Electrical install, LED lighting | from £1,000–1,400 |
| Air conditioning (5 kW split, heat mode) | from £1,200–1,600 |
| Commercial rubber flooring, 30 m² | from £1,000–1,400 |
| Commercial equipment (treadmill, bike, multi-gym, dumbbells) | from £5,000–7,000 |
| Delivery and installation | from £1,000–1,600 |
| Total | from £26,000–33,000 |
The quote for this enquiry: from £25,000–30,000 depending on the final equipment choice and the extent of the glazing. The top of the range is the version with full corner glazing and semi-commercial-grade kit.
Private vs resort — what’s different and why?
At first glance both figures look similar. The differences, though, are structural:
| Aspect | Private | Resort |
|---|---|---|
| Equipment | Prosumer / higher tier | Semi-commercial / commercial |
| Warranty | 2–3 years | 5 years or more |
| Glazing | Standard windows | Corner, panoramic |
| Flooring | Sports 15 mm | Commercial 20–25 mm |
| Depreciation / allowances | None | Central to ROI |
| Goal | Personal comfort | A point of difference + revenue |
A resort can turn a from-£26,000 investment into higher room revenue. Lift the nightly rate by £8–12 and run at 60% occupancy, and you’re looking at payback inside two years. A private gym has no cash payback like that, but it removes the cost of membership (a UK gym runs from £480–720 a year) and — more to the point — gives you 30 seconds from the sofa to your warm-up. If you want to model the numbers for a commercial setup, our ROI calculator is the place to start.
Comparison with the catalogue Gym Box 8×3
If you’re weighing up a made-to-measure 6×5 against the catalogue 8×3 — here’s the short version:
| Gym Box 8×3 Standard | Gym Box 6×5 made-to-measure | |
|---|---|---|
| Floor area | 24 m² | 30 m² |
| Proportions | Narrow and long | More square |
| Cardio zone | Limited | Comfortable |
| Price (module + equipment) | from £13,000 | from £21,000 |
| Lead time | 6–8 weeks | 8–12 weeks |
| Fit to your plot | Standard | High |
The Gym Box 8×3 is a sound choice when the plot is narrow or budget is the priority. If space and proportions matter to you, the 6×5 gives you noticeably more room to train for a moderate uplift.
You’ll find the full catalogue on the container gyms page, and the dedicated Gym Box 6×5 size page goes into the layout in detail.
The questions buyers ask most
Single-pitch roof or a 30° pitch?
Single-pitch (5–8°) is the standard — enough for drainage and visually neutral. A 30° pitch is the option for clients who want the gym to echo the main building’s architecture. Price difference: from £600–1,200.
Do I need planning permission?
A garden gym this size will often fall under permitted development in England, but limits on height, position and total outbuilding coverage apply — and they’re stricter in conservation areas, on listed-building plots and in the devolved nations. Always confirm with your local planning authority before ordering. We cover the detail in our garden gym planning guide.
How long is the lead time?
Typically 8–12 weeks from sign-off on the design. Installing a single module takes 1–2 working days on site.
What kind of foundation?
Concrete pad footings (4–6 pads under a 6×5 module) — from around £800–1,200. Alternatively a concrete slab or a paved hardstanding. The right choice depends on the ground and your aesthetic preference.
Want a quote for your own plot?
Get in touch — tell us the module dimensions you’re considering, how it’ll be used (private / commercial) and the equipment you’d like. We’ll prepare an initial quote free of charge, with no obligation.
Contact us — we usually reply within 24 hours. You can also build your own configuration online or see how completed Gym Assistance projects turned out.