Data Sources of Record

Every numeric claim on this site is tied to one of the primary sources below. Verified 2026-06-24. Re-verified quarterly; see the changelog for the audit log.

BCIS General Building Cost Index Q2 2026

Owner: RICS · Vintage: Q2 2026

BCIS General Building Cost Index Q2 2026· Q2 2026

National Planning Policy Framework, Dec 2025 revision

Owner: DLUHC (MHCLG) · Vintage: Dec 2025

National Planning Policy Framework, Dec 2025 revision· Dec 2025

Planning Practice Guidance: Viability

Owner: DLUHC (MHCLG) · Vintage: Dec 2025

Planning Practice Guidance: Viability· Dec 2025

RICS Valuation Global Standards (Red Book)

Owner: RICS · Vintage: Effective 31 Jan 2025

RICS Valuation Global Standards (Red Book)· Effective 31 Jan 2025

HM Land Registry Price Paid Data

Owner: HM Land Registry · Vintage: Q1 2026 release

HM Land Registry Price Paid Data· Q1 2026 release

Stamp Duty Land Tax (SDLT)

Owner: HMRC · Vintage: Current rules post-31 Mar 2025

Stamp Duty Land Tax (SDLT)· Current rules post-31 Mar 2025

Land and Buildings Transaction Tax (LBTT)

Owner: Revenue Scotland · Vintage: 2026/27 bands

Land and Buildings Transaction Tax (LBTT)· 2026/27 bands

Land Transaction Tax (LTT) Wales

Owner: Welsh Revenue Authority · Vintage: 2026/27 bands

Land Transaction Tax (LTT) Wales· 2026/27 bands

Community Infrastructure Levy

Owner: DLUHC (MHCLG) · Vintage: Current statutory regime

Community Infrastructure Levy· Current statutory regime

Biodiversity Net Gain guidance

Owner: Defra · Vintage: Statutory since 12 Feb 2024 (major sites) and 2 Apr 2024 (small sites)

Biodiversity Net Gain guidance· Statutory since 12 Feb 2024 (major sites) and 2 Apr 2024 (small sites)

Permitted Development Rights

Owner: DLUHC (MHCLG) · Vintage: Class MA and Q current

Permitted Development Rights· Class MA and Q current

Technical Housing Standards (NDSS)

Owner: DLUHC (MHCLG) · Vintage: Applies to PDR conversions from 6 Apr 2023

Technical Housing Standards (NDSS)· Applies to PDR conversions from 6 Apr 2023

HMRC VAT431NB DIY housebuilders reclaim

Owner: HMRC · Vintage: Digital portal active

HMRC VAT431NB DIY housebuilders reclaim· Digital portal active

UK Finance data and research

Owner: UK Finance · Vintage: Q1 2026

UK Finance data and research· Q1 2026

Bank of England statistics

Owner: Bank of England · Vintage: Current bank rate 4.00 percent

Bank of England statistics· Current bank rate 4.00 percent

ONS construction output inflation

Owner: ONS · Vintage: Latest monthly

ONS construction output inflation· Latest monthly

UK House Price Index

Owner: HM Land Registry / ONS · Vintage: April 2026 release

UK House Price Index· April 2026 release

Mayoral CIL2

Owner: Greater London Authority · Vintage: Mayoral CIL2 in force

Mayoral CIL2· Mayoral CIL2 in force

BCIS General Building Cost Index Q2 2026· Q2 2026Appraisal model reviewed by Oliver Wakefield-Smith (data integrity) with chartered-surveyor (MRICS) and CTA tax review. No affiliate links.