The price comparison crews actually run
Premier Inn standard room: £75-£110/night in most UK cities, mid-week. Multiply by 5 nights × 4 people = £1,500-£2,200 for a week. Trade Nest Stays whole-house typically £150-£200/night, all four people in one property = £750-£1,000 for the same week. That's typically £700-£1,200 saved per week per crew of 4.
What you lose by switching
The Premier Inn breakfast. Honestly. Their bed is fine, the housekeeping is fine, the WiFi is fine, the breakfast is genuinely good. If your crew lives for the breakfast, that's a real cost to switching.
What you gain
A kitchen — biggest single difference. £150-£300/week in food cost savings. Privacy — your crew, not a corridor of strangers. Free parking, including van spaces. Workwear-friendly washer. Living room for evening decompression. Self check-in at any hour.