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 for a UK site; delivery is quoted separately by postcode.
Why 6×5 rather than the narrow 8×3?
The catalogue has two kinds of module: narrow and long (7×3, 8×3) and closer to a square (6×5, 7×5). The customers behind real enquiries increasingly choose the second kind — the 6×5 is now our bestseller, and we also build 6×6 and 8×4 to measure.
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
Items and figures follow today’s price list — the same one our online configurator uses.
| Item | Cost (excl. VAT) |
|---|---|
| Gym Box 6×5 m base module: steel frame, cladding, roof, PIR insulation, interior finish, door, electrics, 15 mm rubber flooring, installation | from £36,000 |
| Large front glazing (panoramic windows) | from £1,800 |
| Air conditioning with heating (3.5 kW split) | from £2,400 |
| Zoned LED lighting (hexagonal HEX panels in this project) | from £1,000 |
| Training mirrors | from £900 |
| Equipment (multi-gym, dumbbells with rack, bench, barbell and plates, functional kit) | £6,500–10,400 |
| Delivery to your site | quoted by postcode |
| Total | £48,600–52,500 + delivery |
The quote for this enquiry (March 2026): from £48,600–52,500. The kit: a multi-gym, 2.5–25 kg dumbbells with a rack, a bench, a barbell with 157.5 kg of plates, functional training gear and mirrors. 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 (excl. VAT) |
|---|---|
| Gym Box 6×5 m base module (scope as above) | from £36,000 |
| Front and corner glazing — from panoramic windows to a fully glazed 6 m front | £1,800–7,200 |
| Air conditioning with heating (3.5 kW split) | from £2,400 |
| Commercial rubber flooring, 20–25 mm (upgrade from the standard 15 mm) | £600–1,400 |
| Zoned LED lighting | from £1,000 |
| Guest equipment (treadmill, bike, multi-gym, dumbbells with rack, bench, Olympic bar) | £6,500–9,100 |
| Delivery to your site | quoted by postcode |
| Total | £48,300–57,100 + delivery |
The quote for this enquiry (March 2026): from £48,300–57,100 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 |
| Equipment warranty | Manufacturer’s, home-use terms | Manufacturer’s, commercial-use terms |
| 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-£48,300 investment into higher room revenue. Lift the nightly rate by £8–12 and run at 60% occupancy, and you’re looking at payback in roughly four 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 Gym Box 8×3
If you’re weighing up the 6×5 against the narrower 8×3 — here’s the short version:
| Gym Box 8×3 | Gym Box 6×5 | |
|---|---|---|
| Floor area | 24 m² | 30 m² |
| Proportions | Narrow and long | More square |
| Cardio zone | Limited | Comfortable |
| Turnkey price (module + equipment) | from £39,100 +VAT | from £46,000 +VAT |
| Lead time | 12 weeks from your deposit | 12 weeks from your deposit |
| 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 £1,200–2,400.
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?
12 weeks from your deposit. 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 1 business day. You can also build your own configuration online or see how completed Gym Assistance projects turned out.