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UK Residential & Commercial Development•Professional Standard

Development Conversions &
Programme Duration Suite

High-precision engineering and land calculation tools inspired by TimeAndDate and OnlineConversion, specifically refined for UK residential developers, architects, and planning consultants.

Explore Calculators
Site & Plot Area
Acres, Hectares, Sq Ft & GIA
Programme Duration
Working days & UK Bank Holidays
Material Densities
Muckaway, Grab lorries & C30
Appraisal Metrics
£/sq ft, £/m² & DPH Density
Select Developer Conversion Discipline

Site & Plot Area

Essential for site appraisals, GEA/GIA/NIA & plot density

UK Standards

Standard UK planning & architectural unit

10.7639sq ft

Primary commercial & agency sales metric

Common UK Developer Benchmarks & Shortcuts
Equivalent Values for 1 m²:All units at a glance (OnlineConversion style)
Square Metres (m² / GIA)
1 m²
Square Feet (sq ft)
10.7639 sq ft
Acres (ac)
0.000247 ac
Hectares (ha)
0.0001 ha
Square Yards
1.196 sq yd
Square Kilometres
1.0000e-6 km²
Square Miles
3.8610e-7 sq mi
Roods
0.000988 rood
Appraisal Sheet Details (included on PDF export)
Planning & Appraisal Standards

Precision in Land & Unit Sizing

In UK residential development, small unit discrepancies in Gross Internal Area (GIA) or plot boundaries create massive shifts in Residual Land Value (RLV) and Gross Development Value (GDV). Our tools use official RICS and Land Registry conversion standards.

Programme & Contracts

JCT & NEC4 Contractual Time

Standard building contracts require rigorous calculation of Extension of Time (EOT), relevant events, and practical completion dates. Our duration engine accounts for non-working weekends and statutory England & Wales bank holidays.

DevelopOne Ecosystem

Part of the DevelopOne Platform

These conversion utilities sit alongside DevelopOne Studio, Vesta, and Connect — the systems and guidance that help UK residential developers design, plan, and deliver developments with absolute confidence.