40 Bruton Street

  • The building
  • The area
  • Floor plans
  • Specification
  • Contact

Previous Next

  • 1.0 Design criteria

    1.1 Occupancy figures

    Internal climate
    1 person/10m² net internal area
    Lift provision
    1 person/10m² net internal area
    WC accommodation
    1 person/10m² net internal area (unisex WCs)
    Means of escape
    1 person/6m² net internal area

    1.2 Planning module

    The building has a 1.5m planning module throughout the office areas.

    1.3 Structural grid

    Typically, the structural grid is approximately 6m x 9m and 7.5m x 9m, with 0.75m corner cantilevers.

    1.4 Floor heights

    Structural slab to structural slab
    3,450mm
    Finished floor to ceiling
    2,600mm
    Raised floor zone
    100mm
    Lighting zone
    100mm

    1.5 Substructure

    The building's foundations are a combination of new and existing piles. The basement box is formed with in-situ concrete that is cast within the existing basement perimeter wall.

    1.6 Superstructure

    The superstructure is formed with an in-situ concrete frame. Floors are typically 275mm and perimeter blade columns are 250mm.

    1.7 Temperature

    External
    Winter -4°C db, 100% RH. Summer 29°C db, 50% RH. External condensers to operate down to -10° C db.
    Internal (Offices)
    Winter (min) 20°C db ± 2°C. Summer 22°C db ± 2°C.

    1.8 Outside air provisions

    Offices
    Fresh air supply rate 12 litres per person
    Toilets
    Mechanical extract of 10 air changes per hour.

  • 1.9 Lighting & power load densities for cooling

    Small power (heat gain)
    25W/m² for office areas with an additional 5W/m² for tenants' future use.
    Lighting
    12W/m²

    1.10 Lifts

    Two electric machine roomless passenger lifts are provided:
    Capacity
    13 person (1000kg)
    Speed
    1.6m/sec
    Performance
    20 second interval with 15% handling capacity based on occupancy of 1 person per 10m² NIA.

    2.0 Building services

    2.1 Mechanical services

    Fresh air ventilation
    Fresh air ventilation is provided via the air handling unit (AHU) located at roof level. Air is drawn into the AHU and ducted down to each floor level via supply ductwork within the mechanical riser. The AHU provides fresh air to all office floors for occupant ventilation via the sheet metal ductwork riser and on floor
    distribution ductwork. Return air is extracted from the office space via a stub duct adjacent to the riser and ducted back to the extract fan at roof level. The office supply AHU is fitted with 'DX' coils and space for a future humidification system based on local electric steam generation. The office AHU and extract fan is fitted with a heat recovery device (run around coil).
    Heating and cooling
    Simultaneous heating and cooling to the office areas, lift lobbies and the main building reception is provided by a VRV (variable refrigerant volume) heat pump system. This consists of external condenser units located on the roof plant area. Refrigerant pipework from the heat pump units are routed on cable trays and via the pipework riser to each floor level. At each floor level the refrigerant pipework connects to controller boxes located in the ceiling void. Pipework from the controller boxes serves ceiling void mounted FCUs located throughout the office space.

  • 2.2 Provision for tenant plant

    Roof plant area has been allocated for the following tenant plant items:
    – 2 no 1.5 m diameter satellite dishes. – The office supply AHU is fitted with 'DX' coils and space for a future humidification system.
    – Capped-off connection within a riser at each floor level for future tea points is provided.
    – Capped-off drainage connections are provided at low level within risers, should an extension of the services to future tea points be required by tenants.
    – Capped-off vent connections at high level within the ceiling void are provided should future tea points be required by tenants.
    – Capped off extract duct for future tea points.
    – IT riser space provided for future tenants' IT installations.
    – Containment provided for tenants' security systems.

    2.3 Electrical services

    Installation
    – An incoming 11 kV electrical supply is provided to the building from the networked EDF sub station.
    – Connection between EDF owned transformer and LV Switchboard.
    – Rising busbar mains utilising plug in tap-off units on each floor complete with tenant distribution board for lighting and power.
    – Base building generator set complete with fuel oil storage tank for emergency systems.
    Lighting
    The lighting comprises of modular T5 fluorescent luminaires, with high frequency ballasts for the general office spaces. All office lighting is controlled from the local area controllers located within the tenants’ riser (lighting controls). The daylight lighting control system provided in the perimeter office areas switches off the lighting system when the required lux levels are met by natural daylight. Supplementary downlighters around the perimeter are provided to comply with CIBSE Lighting Guide recommendations. The designs are sympathetic with LG7 recommendations, as appropriate.
    Small power
    Supplies to landlord's services (toilets, stairwells, circulation space, plantrooms etc) are provided. Underfloor power distribution and the provision of floor boxes in the offices shall be undertaken by the tenants.

  • 2.4 Telecommunications

    Dedicated incoming wire ways from the street are provided for telecommunication service providers to serve the office building and the retail unit. The wire way serving the office terminates in the basement IT intake room. Cable trays have been provided within the tenants' IT riser for future use.

    2.5 Security

    Cable containment is provided for the security detection and intruder and access control systems.

    2.6 Façade cleaning system

    A cleaning cradle is located at sixth floor level and accesses all facades by traversing along the maintenance terrace.

    2.7 Service access

    A drop off point has been maintained and improved along Bruton Place. Level access from Bruton Place is via double doors that lead up to the main lobby area and lifts.

    3.0 Environmental

    The building has achieved a 'very good' BREEAM rating. Consideration has been given to national and local environmental policy and the landlord's own specific policy.

    4.0 Public artwork

    The building's reception area has a semiabstract glasswork by artist Georgina Griffiths. The work forms part of the facade overlooking Bruton Place and is inspired by the shifting, stretching shadows and reflections of people within the surrounding urban environment. Its appearance changes throughout the day as light and movement vary on both sides.