SPECIFICATION
General Description of the building
120 Holborn offers the following functions:
Office accommodation on the first to ninth floors adjacent to Holborn Circus and first to sixth floors to the south west corner of the site
Entrance & Lobby
Receptions area
Walls: | Timber linings, brass resin metal panels, back painted glass with recessed feature doorsets and stainless steel skirting |
Floors: | Large format, grey porcelain tiles |
Ceilings: | Plasterboard with recessed slot lighting |
Lift Lobbies
Walls: | Black steel lift architraves and over panels with plaster and paint elsewhere |
Floors: | Large format, grey porcelain tiles |
Ceilings: | Plasterboard with recessed slot lighting |
Lift Cars
Walls: | Variegated brass resin metal panels to side walls and mirror to rear wall |
Floors: | Large format, grey porcelain tiles |
Ceilings: | Panel ceiling with feature lighting |
Toilets
Walls: | Ceramic tiles to wet areas, plaster and paint elsewhere |
Floors: | Grey porcelain tiles |
Ceilings: | Accessible baffle ceiling (SAS Tubeline) |
Cubicles: | High gloss lacquer to outside face, matt finishes inside |
Service/Loading areas
The main loading bay is located at lower ground floor with further storage accommodation
Planning Grid
Generally 9m x 7.5m
Floor Loading(s)
Offices: | 2.5kN/m2 (+1kN/m2 partitions) |
Storage (basement): | 7.5kN/m2 (+1kN/m2 partitions) |
First floor: | 2.5kN/m2 |
Floor to ceiling height
Offices: | 2.70m floor to ceiling height (varies) |
Raised Floor
600x600mm metal encapsulated tile on pedestals, 90mm overall thickness
Column Details & Grid
Water supply and drain provided in two locations to large floors (1st - 6th) and one location 7th - 9th adjacent to toilet cores
Tea Point/Kitchen installation
Capped connections on each floor (as above)
Toilet Provisions
Toilet provision has been made based on an average population density of one person per 8m2 at 60:60 male to female ratio (based on single occupancy)
Cleaners cupboard provision
Flexibility to provide one per floor (No water and drainage provision currently allowed for)
Security channels/lift calling
The infrastructure for speed turnstiles will be in place
Services
General Description
Major ventilation, heating and cooling base building plant is located at basement and roof levels. Tenant plant space is available within the first floor courtyard
Air Conditioning
Offices (excluding 3rd floor): | Variable Air Volume (VAV) |
Reception and 3rd floor: | Variable Refrigerant Flow (VRF) |
Electrical Supply
Three UKPN substations located at lower ground level on site. Each substation feeds a separate LV switch room (MV1, MV2 and MV3), which in turn supply 120 Holborn and The Hatton Garden Centre. The electrical infrastructure (switchgear and rising busbar system) serving 120 Holborn have been replaced as part of the 2014 refurbishment
Gas
An incoming metered gas supply from the adjacent street network terminates in the basement gas meter room to serve central plant only (Not for Tenant use)
Water
Incoming metered water supplies from the adjacent street network terminate in basement tank rooms in each core to serve central plant only (Not for Tenant use)
Telecoms
Cable ducts into building from local infrastructure to frame rooms and risers
Route from data riser to dedicated satellite area at roof area
Mechanical Plant
Central chilled water plant is located within a basement plantroom comprising four water cooled chillers. From the secondary pumps chilled water is supplied to the air handling unit cooling coils with pipe distribution located within the risers. Central boiler plant is located within a basement comprising three gas fired shell and tube boilers. From the secondary pumps hot water is supplied to the air handling unit heating coils with heating return distribution located within the core services risers
Lifts
Hatton Garden (Southeast Core):
Fitted with 4 no 20 person (1600kg) passenger lifts and 1 no 8 person (600kg) fire fighting type originally manufactured by Otis. The lifts serve 10 levels (G – 9). The lifts have a conventional traction drive, positioned in an overhead full sized machine room and have a speed of 2.5 m/s
Leather Lane (Southwest Core):
Fitted with 2 no 12 person (900kg) passenger lifts and 1 no 8 person (600kg) fire fighting type originally manufactured by Otis. The lifts serve 9 levels (B,LG,G – 6). The lifts have an conventional traction drive, positioned in an overhead full sized machine room
Standby power generation
There is a standby diesel generator at lower ground level that is used to power essential security, fire protection and smoke extract systems in the event of no mains power being available
Space available at basement level to fit a tenant generator (250 kw)
Tenant Plant
Tenant plant space is available on the 1st floor courtyard; this space is open to air
Heating & Cooling Design Parameters
External temperature
Winter | Summer |
-1 C | 28C db / 20C wb |
Office Floors
-1 C | 28C db / 20C wb |
Receptions area
-5 C Humidity (Uncontrollable) |
30C db / 20C wb |
Internal office Reception
Winter | Summer |
20C | 22 C +/- 2 C |
Non air conditioned areas
Stair cases
Uncontrolled | Uncontrolled |
Toilet areas
Winter | Summer |
18 C | Uncontrolled |
Occupancy
HVAC Design Density one person per 8m2 (NLA)
Ventilation Rates
Office Floors
1.4l/s/m2
Showers
10ACH Extract 8 ACH Supply
Toilets
10ACH Extract 8 ACH Supply
Internal Heat Gains
Small Power
25W/m2
Lighting
15W/m2
Occupancy
75W/Person sensible 55W/Person latent
Lighting
General description
Generally, lighting in the office space will be provided by a combination of recessed modular luminaires and linear continuous LED strip luminaires
Illumination Levels
Office Areas: | 350 - 450 lux at working plane with 80% uniformity |
Office Areas: | 200 lux (300 lux over reception desk) |
Toilet Areas: | 100 - 150 lux at floor level |
Circulation: | 150 lux at floor level |
Emergency
1 lux minimum on escape routes, 0.5 lux minimum in open plan
Power
Lighting
15W/m2
Small power
General: 15W/m2 general office areas with 10 W/m2 tenants supplementary on all office floors, giving a total of 25 W/m2
Future upgrade power
12% additional spare capacity on transformers
Storage
-
Fire Detection
Category: BS 5839 Type L2
Sprinkler Protection
The basement and lower ground are sprinklered (mains fed)
Internal noise criteria
General open plan offices: NR35
NR38 Floors 1, 2, 7
Reception NR40
Toilet, Stairs NR40
Tenant riser provision
Tenant space under review
IT Tenant communications
Satellite provision on roof to be agreed
Cat A fit out
Air conditioning strategy
Offices will be air conditioned via VAV units
Pipework
To serve central plant only
Lighting
Lighting as noted above
Fire Alarm
BS 5839 Type L2
VA/PA system
BS 5839 Type L2
Bicycle Storage
160 Bicycle Spaces
Shower & Locker Facilities
16 Showers 160 Lockers
Car Parking
24 vacant car parking space
BREEAM
Very good (subject to assessment)