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Below an analyze of the tender cost breakdown from the June 12, 2024 tender submission, going through each major element and discussing the rates:

0. DEMOLITIONS & ALTERATIONS

• £128.89/m² GIFA (£8,120 total)
• This equates to £128.89/m² of actual building area
• Rate appears reasonable given the careful demolition required within an operational surgery, including temporary protection and removal of windows/partitions

0. SUBSTRUCTURE

• £453.48/m² GIFA (£28,569 total)
• Rate is on the higher side but justified given:
• Strip foundations with reinforcement
• Ground bearing slab with mesh reinforcement
• Full hardcore preparation and insulation
• Complex detailing around existing building connections

0. SUPERSTRUCTURE (Total £49,964 – £793.07/m² GIFA)
   Breaking down the superstructure elements:

2C. Roof

• £377.65/m² GIFA but £199.93/m² of actual roof area
• Includes trusses, covering, insulation and rainwater goods
• Rate appears competitive for specified quality

2E. External Walls

• £177.25/m² GIFA but £124.08/m² of actual wall area
• Cavity wall construction with insulation and render finish
• Rate is appropriate for specification level

2F. Windows/External Doors

• £85.46/m² GIFA but £598.19/m² of actual opening area
• High quality aluminum frames specified
• Rate reflects current market costs for commercial grade items

2G. Internal Walls/Partitions

• £21.71/m² GIFA but £26.31/m² of actual partition area
• Blockwork construction
• Very competitive rate

2H. Internal Doors

• £131.00/m² GIFA but £1,650.55 per door
• Fire rated doors with high spec ironmongery
• Rate reflects commercial healthcare quality requirements

1. INTERNAL FINISHES (Total £13,581 – £215.57/m² GIFA)

• Wall finishes: £88.68/m² GIFA (£28.22/m² of actual wall area)
• Floor finishes: £64.92/m² GIFA (£64.92/m² of actual floor area)
• Ceiling finishes: £61.97/m² GIFA (£61.97/m² of actual ceiling area)
• Rates are appropriate for healthcare standard finishes

1. FITTINGS

• £23.17/m² GIFA
• Relatively low as main medical equipment excluded
• Covers basic fitted furniture only

1. SERVICES (Total £68,111 – £1,081.11/m² GIFA)

• Mechanical: £346.31/m² GIFA
• Electrical: £676.35/m² GIFA
• BWIC: £58.45/m² GIFA
• Services costs are high but typical for medical facility requirements

1. EXTERNAL WORKS

• Siteworks: £406.85/m² GIFA
• Drainage: £161.21/m² GIFA
• Rates appropriate for scope including paths, landscaping and drainage connections

1. PRELIMINARIES

• £712.95/m² GIFA (17.9% of cost)
• Higher than typical but reflects working restrictions in operational facility

1. CONTINGENCIES

• £79.37/m² GIFA
• 2% provision which is relatively low

OVERALL ANALYSIS:

• Total cost £255,510 equating to £4,055.67/m² GIFA
• Rate is high but justifiable for:
• Small extension (only 63m²) losing economies of scale
• High services content for medical use
• Working restrictions in operational facility
• Quality specifications throughout
• Current market conditions (June 2024)

The costs appear to represent reasonable value given the project constraints and specifications, though careful cost control will be needed during delivery.