Zone depths per use type — sources, values, rationale

Companion: topic-bim-building-width-method for the formula and the mirror cross-section.

This article catalogues the per-side zone depths feeding the Tile system and the floor plate methodology; the inventory of named Key Plans is in the Key Plans index. Sub-type specialisations are documented under Professional Office and its Medical, Business, and Private Office sub-articles.

[edit]Summary table — canonical values

The Z1/Z2/Z3 values below are the per-side depths (Z1 and Z2 are mirrored, Z3 is centreline single). All values trace to the cited source.

Use Type	Z1 Habitat	Z2 Magazine	Z3 Corridor	Building Width	Source
[[topic-bim-private-office-key-plans	Private Office]]	5.9944 m / 19'8"	1.3716 m / 4'6"	—	14.73 m / 48'4"
Academic	4.7 m / 15'5"	3.0 m / 9'10"	—	15.40 m / 50'6"	Summary V2, 2025-05-13
[[topic-bim-professional-office-key-plans	Professional Office]] (V12 baseline)	6.0 m / 19'8"	3.0 m / 9'10"	3.0 m / 9'10"	21.00 m / 68'11"
Laboratory	6.7818 m / 22'3"	4.8006 m / 15'9"	3.048 m / 10'0"	26.21 m / 86'0"	Summary V2; IBC high-hazard egress
[[topic-bim-medical-key-plans	Medical]]	7.2819 m / 23'10"	4.877 m / 16'0"	2.892 m / 9'5"	27.20 m / 89'3"
[[topic-bim-business-key-plans	Business]]	5.51 m / 18'1"	9.26 m / 30'5"	2.75 m / 9'0"	29.30 m / 96'2"
Civic	6.0 m / 19'8"	7.23 m / 23'9"	3.6 m / 11'10"	30.06 m / 98'8"	Synthesised values; no completed sketch

Formula: Width = 2 × (Z1 + Z2) + Z3. See topic-bim-building-width-method for the derivation.

[edit]Per use type

[edit]Private Office (PO-1 / PO-2 / PO-3)

Zone	Value	Sketch evidence
Z1 Habitat	5.9944 m / 19'8"	"19'-8"" on each of PO-1, PO-2, PO-3
Z2 Magazine	1.3716 m / 4'6"	"4'-6"" on each sketch (shallow storage zone, below the dashed centreline)
Z3 Corridor	— (none)	Each office opens to the shared building corridor (outside the leasehold)
Key plan SF	PO-1 = 325, PO-2 = 465, PO-3 = 685	Sketch labels
Key plan m²	30.19, 43.20, 63.64	Calculated from SF
Building width	14.73 m / 48'4"	2 × (5.9944 + 1.3716)

Private Office is the narrowest of the use types. The 5.9944 m Habitat is marginally under the 6.0 m European Lighting Standard threshold — flagged for review at Key Plan sign-off.

Combinations: PO-1 + PO-1 = 60.4 m² (650 SF); PO-1 + PO-2 = 73.4 m² (790 SF); PO-1 + PO-3 = 93.8 m² (1,010 SF); PO-2 + PO-3 = 106.8 m² (1,150 SF). These fill the gap between Private Office Large and Professional Office Small.

[edit]Academic (A1 / A2 / A3)

Zone	Value	Source
Z1 Habitat	4.7 m / 15'5"	Summary V2
Z2 Magazine	3.0 m / 9'10"	Summary V2 (the source shows "3'7"" in feet, which is a transposition; 3.0 m = 9'10" is correct)
Z3 Corridor	— (none)	Suites open to building corridor
Key plan m²	Small 87.7 / Medium 240.3 / Large 376.3	Key Plans Samples V2
Key plan SF	Small 944 / Medium 2,586 / Large 4,050
Building width	15.40 m / 50'6"	2 × (4.7 + 3.0)

Academic compresses Habitat below 6 m because seating faces forward (toward a podium/board) rather than toward the façade. The European Lighting Standard applies to workstations; auditorium-style seating is not workstation use.

Inconsistency: building-width-calculator.dtcg.json records Academic Small as 105 m² / 1,131 SF, while professional-office-subtypes.dtcg.json records it as 87.7 m² / 944 SF. Pending operator decision on which is canonical.

[edit]Professional Office (baseline)

Zone	Value	Source
Z1 Habitat	6.0 m / 19'8"	V12 (January 2025)
Z2 Magazine	3.0 m / 9'10"	V12 — marked "TBD"; placeholder
Z3 Corridor	3.0 m / 9'10"	V12 — marked "TBD"; placeholder
Key plan m²	Small 130.06 (only)	DTCG token; Medium/Large pending
Key plan SF	Small 1,400 (only)	DTCG token
Building width	21.00 m / 68'11"	V12 stated total

Professional Office is the baseline use type — the type from which the other Professional Centre sub-types (Medical, Business, Laboratory, Academic, Civic) are derived by varying Z1, Z2, and Z3.

V12 explicitly marks Z2 and Z3 as "TBD" with 3 m placeholders. When the Professional Office Key Plan is completed, the operator will lock Z2 and Z3 to match the furnished layout.

[edit]Laboratory (L1 / L2 / L3)

Zone	Value	Source
Z1 Habitat	6.7818 m / 22'3"	Summary V2
Z2 Magazine	4.8006 m / 15'9"	Summary V2
Z3 Corridor	3.048 m / 10'0"	Summary V2 (IBC high-hazard occupancy minimum)
Key plan m²	Small 195.0 / Medium 316.0 / Large 400.7	Samples V2
Key plan SF	Small 2,099 / Medium 3,401 / Large 4,313	Samples V2
Building width	26.21 m / 86'0"	2 × (6.7818 + 4.8006) + 3.048

Laboratory's wider Z1 accommodates bench depth (Treston TP-915 ≈ 900 mm) and fume-hood clearance (≈ 940 mm + 1,500 mm egress in front of the hood). The 10'0" corridor is the IBC high-hazard occupancy egress minimum.

Specialisations: Medical Laboratory, Research Laboratory.

[edit]Medical (M1 / M2 / M3)

Zone	Value	Sketch evidence
Z1 Habitat	7.2819 m / 23'10"	"286 5/8"" on M1/M2/M3 (= 7.282 m)
Z2 Magazine	4.877 m / 16'0"	"192"" on M1/M2/M3 (= 4.877 m)
Z3 Corridor	2.892 m / 9'5"	"113 7/8"" on M1/M2/M3 (= 2.892 m)
M3 (Small, 2 dental chairs)	2,401.5 SF / 223 m²	Sketch label
M1 (Medium, 4 dental chairs)	3,567.7 SF / 331 m²	Sketch label
M2 (Large, 6 dental chairs)	5,231.4 SF / 486 m²	Sketch label
Building width	27.20 m / 89'3"	2 × (7.2819 + 4.877) + 2.892

Medical has the widest Habitat across the use types. The depth accommodates exam-table depth (Midmark 626 ≈ 790 mm) plus patient seating, clinician circulation, and a reception window facing the façade. The 2.892 m corridor is the ADA/CSA-B651 stretcher-and-wheelchair clearance.

Operator notes on the M3 sketch flag: "Add second door for emergencies", "Line of sight — safety — reception needs to see the door", and "Move seats down out of Zone #1".

Specialisations: Dentist, General Practitioner.

[edit]Business (B1 / B2 / B3)

The Business use type has 21 enumerated width options per Notes V3. The token store records the widest symmetric option as the default:

Zone	Value	Source
Z1 Habitat	5.51 m / 18'1"	Notes V3 Option A
Z2 Magazine	9.26 m / 30'5"	Notes V3 Option A (widest enumerated)
Z3 Corridor	2.75 m / 9'0"	Notes V3 (fixed across all 21 options)
Key plan SF	Small 3,350 / Medium 4,302 / Large 7,524	Sketches 2-4
Building width	32.29 m / 105'11"	2 × (5.51 + 9.26) + 2.75 (Option A/A)

Important caveat: Notes V3 enumerates 21 combinations (Option A/A through D/D), where the two letters denote the left-side and right-side Z1/Z2 choices. The narrowest Business option is 25.29 m (D/D) and the widest is 32.29 m (A/A). The asymmetric options are generally disfavoured for tile composition because demising walls must absorb the asymmetry.

From operator commentary in Notes V3 on Option D: "The overall area of the Fixed Floor Plates [is] Professional Centres at approximately 19,000 SF to 23,000 SF and Suburban Office at approximately 17,000 SF to 21,000 SF."

[edit]Civic (C1 / C2 / C3)

Zone	Value	Source
Z1 Habitat	6.0 m / 19'8"	Synthesised (no completed sketch)
Z2 Magazine	7.23 m / 23'9"	Synthesised (token store value)
Z3 Corridor	3.6 m / 11'10"	Synthesised — public assembly egress
Key plan m²	Small 270 / Medium 577 / Large 822	Token store (samples-derived)
Key plan SF	Small 2,912 / Medium 6,215 / Large 8,850	Token store
Building width	30.06 m / 98'8"	2 × (6.0 + 7.23) + 3.6

Civic does not yet have a completed sketch. Z1/Z2/Z3 values in the token store are synthesised from the design intent (public records storage; widest corridor for ceremonial circulation and public assembly egress). Specialisations: Courtroom, Municipal Office, Cultural Space, Civic Assembly.

[edit]The 0.7 m perpendicular-desk addition

Applies to any Z1 Habitat that arranges desks perpendicular to the façade. Token: bim.circulation-addition.perpendicular-desk = 0.7 m. Effective Z1 = 6.0 + 0.7 = 6.7 m when perpendicular desks are required to seat three desks in series.

[edit]Floor-plate target ranges

Class	Range
Professional Centres	19,000 – 23,000 SF
Suburban Office	17,000 – 21,000 SF

The current token store hard-codes 20,000 SF as floorPlate.netLeasableSF. Convert to a range with PC and SU variants.

[edit]Future research

Confirm Academic Small key plan area: 87.7 m² (944 SF) per Samples V2 vs. 105 m² (1,131 SF) per DTCG token store
Complete Civic sketch to anchor Z1/Z2/Z3 values to a real furniture arrangement
Confirm operator preference for Business: Option A/A (widest, 32.29 m) versus a balanced option such as C/C (~27 m)
Capture manufacturer SKU dimensions in a furniture.dtcg.json file
Complete Professional Office Z2/Z3 (currently V12 placeholders at 3 m / 3 m TBD)
Document the 0.7 m perpendicular-desk supplement as an effective-Habitat modifier
Verify whether the 6.0 m Habitat tracks a specific clause in EN 12464-1

[edit]Source-document inconsistencies (open)

#	Issue	Action
1	Academic Small area: 105 m² (DTCG) vs 87.7 m² (subtypes DTCG / Samples V2)	Operator decision needed
2	Medical Z1 token = 7.2 m, sketch = 286 5/8" = 7.28 m	Token file pending update to 7.2819 m
3	Professional Office Z2/Z3 placeholders (V12: 3 m / 3 m TBD)	Values to confirm from Key Plan
4	Floor-plate hard-coded 20,000 SF; Notes V3 directs ranges	Convert to range token
5	21 m PDF total vs prior 21.6 m token arithmetic	Reconciled 2026-05-17 by restoring V12 values