House Construction Cost Planning: Belfast, United Kingdom

Belfast house cost planning using the World Bank ICP 2021 national construction price-level index of 155.3, plus a GeoNames-based local comparable-search shortlist.

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Last updated September 15, 2026 · National screening observation from the [World Bank ICP 2021 API](https://api.worldbank.org/v2/sources/90/country/GBR/classification/PX.WL/series/1501200/time/YR2021/data?format=json) and [ICP data documentation](https://www.worldbank.org/en/programs/icp/data); locality and population from the [GeoNames GB dump](https://download.geonames.org/export/dump/GB.zip) (CC BY 4.0 snapshot 2026-08-26, GeoNames ID 2655984). The PLI is not a city cost/m² rate, current escalation series or tender estimate.

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Direct answer

For early house construction cost planning in Belfast, the World Bank ICP reports a 2021 United Kingdom construction price-level index of 155.3, with the world equal to 100. This is a national comparison—not a Belfast GBP/m² rate or tender estimate—so replace it with current local evidence before budgeting or procurement. The observation covers construction across United Kingdom in 2021; it does not measure a Belfast market basket or current house tenders. GeoNames 2655984 records the locality at 54.5968, -5.9254, with snapshot population 348,005. That ranks Belfast 13 of 50 listed places, while Glasgow is the nearest listed peer at about 176 km. Use these facts only to plan the comparable search. Obtain current local rates on a consistent area basis, then reconcile scope, taxes, fees, contingency and escalation. Retain the source, base date and reviewer when local evidence replaces the screening ratio.

Content and cited inputs reviewed by Scott Barrington, Harth founder and architectural technology specialist · Published 2026-08-26 · Updated 2026-09-15.

What does the 155.3 construction index mean?

The World Bank ICP 2021 construction PLI for United Kingdom is 155.3, compared with a world benchmark of 100. It is a national spatial price comparison assembled for the 2021 reference year. It does not say that house work in Belfast costs 1.553 times a current world rate.

Which Belfast inputs are known?

The reproducible locality point is 54.5968, -5.9254 (GeoNames 2655984). Its snapshot population is 348,005, ranked 13 of 50 listed places; GeoNames classifies it as a first-order administrative seat in administrative area NIR. These facts shape the local comparable search, not the price.

What must a project estimate add?

For a Belfast house project, reconcile dwelling size, structural system, envelope specification, kitchens and bathrooms. Use a consistent gross-floor-area basis and record the following before reliance.

Estimate field	Screening record	Project requirement
National context	ICP 2021 PLI 155.3	Retain only as dated cross-country context
Local GBP/m² rate	Not supplied	Current comparable with named source and base date
Area and scope	Gross floor area; scope unresolved	Measurement standard, specification and procurement route
Additions	Not supplied	Taxes, fees, site work, contingency and escalation
Review	Automated source and arithmetic QA	Qualified local cost review

Belfast comparable-location search screen

This shortlist is computed from the checked GeoNames snapshot. Distance and population help prioritize where to request comparables; neither is used as a cost multiplier.

Listed place	Great-circle km from Belfast	Snapshot population	Admin area
Glasgow	176	626,410	SCT
Preston	229	313,332	ENG
Edinburgh	229	514,990	SCT
Birkenhead	233	325,264	ENG
Liverpool	233	496,770	ENG
Coventry	380	345,324	ENG
Bradford	286	366,187	ENG
Brent	505	329,100	ENG

Price-level normalization worksheet

For a validated reference rate R from a country with construction PLI P, the transparent screening calculation is R × (155.3 ÷ P). At P = 100 the dimensionless ratio is 1.553; no world cost rate is asserted. Keep the reference rate's currency, base date, area basis and scope attached.

Input	Recorded value	Release condition
Target national PLI	155.3 (World = 100, 2021)	Screening context only
Reference construction PLI P	User-supplied from the same ICP classification/year	Must match reference rate country
Validated reference rate R	User-supplied	Named source, currency, date, area and scope
Local Belfast adjustment	Not asserted	Replace with current local comparable evidence
Result status	Screening normalization	Not a budget, quote or tender estimate

Sources and method

National screening observation from the World Bank ICP 2021 API and ICP data documentation; locality and population from the GeoNames GB dump (CC BY 4.0 snapshot 2026-08-26, GeoNames ID 2655984). The PLI is not a city cost/m² rate, current escalation series or tender estimate.

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Frequently asked questions

Does the 155.3 index give a house cost per m² for Belfast?

No. 155.3 is the World Bank ICP 2021 national construction price-level index for United Kingdom, with the world equal to 100. It is a cross-country screening statistic, not a Belfast GBP/m² rate, escalation index, quote or tender estimate.

How should a Belfast house estimate replace this screening benchmark?

Collect current Belfast comparables on a consistent gross-floor-area basis, reconcile dwelling size, structural system, envelope specification, kitchens and bathrooms, and state base date, currency, taxes, fees, site work, contingency and escalation. A qualified local cost professional should review the resulting project estimate.

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