# Barn conversion cost: Barn Conversion Cost Index

> The Barn Conversion Cost Index carries 14 published figures read from 9 sources' own pages; the 6 published figures given without a breakdown run from 1,200 to 2,500 GBP, read 11 November 2026.

Class Q Checker · https://classqchecker.co.uk/datasets/barn-conversion-cost-index/ · computed 2026-11-12

**Range without a breakdown:** 1,200 to 2,500 GBP (range 1,200 to 2,500 GBP; 14 published figures; 9 of 43 sources read publish one).

9 of the 43 named sources read in full publish a figure; 34 publish none, read 11 November 2026.

## By barn_structure and line_item

| Breakdown | Median | Range | Sources |
|---|---|---|---|
| barn_structure steel-portal | 1,200 GBP | 1,200 to 1,200 GBP | 1 |
| barn_structure timber-frame | 1,800 GBP | 1,800 to 1,800 GBP | 1 |
| barn_structure brick | 1,900 GBP | 1,900 to 1,900 GBP | 1 |
| barn_structure stone | 2,200 GBP | 2,200 to 2,200 GBP | 1 |
| barn_structure listed | 2,600 GBP | 2,600 to 2,600 GBP | 1 |
| line_item bat-preliminary-roost-assessment | 200 GBP | 200 to 200 GBP | 1 |
| line_item bat-emergence-survey | 1,000 GBP | 1,000 to 1,000 GBP | 1 |
| line_item flood-risk-assessment | 295 GBP | 295 to 295 GBP | 1 |

## Every figure, with its source

One row per source: the figure the source's own page publishes, the page, and the day it was read.

| Source | Figure | Breakdown | Read |
|---|---|---|---|
| [Best Builders - barn conversion cost per m2 2026](https://www.bestbuilders.co.uk/guides/costs/how-much-does-a-barn-conversion-cost-per-m2-2026) | 2,600 GBP | listed | 2026-11-11 |
| [Thomas Studio (chartered architect) - barn conversion cost UK](https://www.thomasstudio.co.uk/article/barn-conversion-cost-uk/) | 2,500 GBP |  | 2026-11-11 |
| [Mosaic Bespoke - barn conversion costs and planning](https://mosaicbespoke.co.uk/barn-conversion-costs-and-planning/) | 2,500 GBP |  | 2026-11-11 |
| [Peninsula Custom Construction - cost of a barn conversion in Devon](https://www.peninsulacustomconstruction.com/cost-of-a-barn-conversion-in-devon/) | 2,300 GBP |  | 2026-11-11 |
| [Best Builders - barn conversion cost per m2 2026](https://www.bestbuilders.co.uk/guides/costs/how-much-does-a-barn-conversion-cost-per-m2-2026) | 2,200 GBP | stone | 2026-11-11 |
| [Ikonic Architecture - barn conversion cost guide for Norfolk and Suffolk](https://www.ikonic-architecture.co.uk/post/barn-conversion-cost-guide-for-norfolk-and-suffolk) | 2,000 GBP |  | 2026-11-11 |
| [Best Builders - barn conversion cost per m2 2026](https://www.bestbuilders.co.uk/guides/costs/how-much-does-a-barn-conversion-cost-per-m2-2026) | 1,900 GBP | brick | 2026-11-11 |
| [Best Builders - barn conversion cost per m2 2026](https://www.bestbuilders.co.uk/guides/costs/how-much-does-a-barn-conversion-cost-per-m2-2026) | 1,800 GBP | timber-frame | 2026-11-11 |
| [Cost Estimator - barn conversion cost UK 2026](https://costestimator.co.uk/barn-conversion-cost-uk-2026/) | 1,800 GBP |  | 2026-11-11 |
| [Best Builders - barn conversion cost per m2 2026](https://www.bestbuilders.co.uk/guides/costs/how-much-does-a-barn-conversion-cost-per-m2-2026) | 1,200 GBP | steel-portal | 2026-11-11 |
| [First4Estimating - barn conversion costs UK](https://www.first4estimating.com/blog/barn-conversion-costs-uk.html) | 1,200 GBP |  | 2026-11-11 |
| [Indigo Surveys - bat surveys](https://indigosurveys.co.uk/bat-surveys/) | 1,000 GBP | bat-emergence-survey | 2026-11-10 |
| [Flood Risk Environmental - pricing](https://www.floodrisk-environmental.co.uk/pricing) | 295 GBP | flood-risk-assessment | 2026-11-11 |
| [Indigo Surveys - bat surveys](https://indigosurveys.co.uk/bat-surveys/) | 200 GBP + VAT | bat-preliminary-roost-assessment | 2026-11-10 |

## The sentence each figure was read from (14)

- [Best Builders - barn conversion cost per m2 2026](https://www.bestbuilders.co.uk/guides/costs/how-much-does-a-barn-conversion-cost-per-m2-2026), read 2026-11-11: "Listed barn £2,600–£3,500+ Planning + listed consent Heritage barns, tightest controls"
- [Thomas Studio (chartered architect) - barn conversion cost UK](https://www.thomasstudio.co.uk/article/barn-conversion-cost-uk/), read 2026-11-11: "A barn conversion in the UK in 2026 will typically cost £2,500 to £3,500 per square metre for the build itself — before VAT, professional fees, and the extras almost every guide forgets to mention."
- [Mosaic Bespoke - barn conversion costs and planning](https://mosaicbespoke.co.uk/barn-conversion-costs-and-planning/), read 2026-11-11: "As a working guide, quality barn conversions in this region typically run from around £2,500 per square metre and rise with structural complexity, glazing ambition and specification."
- [Peninsula Custom Construction - cost of a barn conversion in Devon](https://www.peninsulacustomconstruction.com/cost-of-a-barn-conversion-in-devon/), read 2026-11-11: "In 2026, most non-listed Devon barn conversion costs sit around £2,300–£3,300 per square metre for the core build, excluding VAT, professional fees and surveys."
- [Best Builders - barn conversion cost per m2 2026](https://www.bestbuilders.co.uk/guides/costs/how-much-does-a-barn-conversion-cost-per-m2-2026), read 2026-11-11: "Stone barn £2,200–£3,200 Full planning Premium rural character homes"
- [Ikonic Architecture - barn conversion cost guide for Norfolk and Suffolk](https://www.ikonic-architecture.co.uk/post/barn-conversion-cost-guide-for-norfolk-and-suffolk), read 2026-11-11: "A barn conversion can cost anywhere from £2,000 to £3,000 per square metre, depending on location, materials, and the existing structure."
- [Best Builders - barn conversion cost per m2 2026](https://www.bestbuilders.co.uk/guides/costs/how-much-does-a-barn-conversion-cost-per-m2-2026), read 2026-11-11: "Brick barn £1,900–£2,700 Full planning common Solid shell, good thermal mass"
- [Best Builders - barn conversion cost per m2 2026](https://www.bestbuilders.co.uk/guides/costs/how-much-does-a-barn-conversion-cost-per-m2-2026), read 2026-11-11: "Timber-frame £1,800–£2,500 Class Q or full planning Character conversions, most common route"
- [Cost Estimator - barn conversion cost UK 2026](https://costestimator.co.uk/barn-conversion-cost-uk-2026/), read 2026-11-11: "Many barn conversions fall somewhere between £1,800 and £3,500+ per m², depending on the building condition, access, services, specification and planning constraints."
- [Best Builders - barn conversion cost per m2 2026](https://www.bestbuilders.co.uk/guides/costs/how-much-does-a-barn-conversion-cost-per-m2-2026), read 2026-11-11: "Barn type Cost per m² Planning route Best for Steel-portal / Dutch £1,200–£1,800 Often Class Q PD Lowest cost, modern agricultural sheds"
- [First4Estimating - barn conversion costs UK](https://www.first4estimating.com/blog/barn-conversion-costs-uk.html), read 2026-11-11: "Barn conversion costs in the UK typically range from £1,200 to £2,500 per square metre, with most projects falling between £1,500 and £2,000 per square metre."
- [Indigo Surveys - bat surveys](https://indigosurveys.co.uk/bat-surveys/), read 2026-11-10: "A preliminary roost assessment starts from £200 + VAT and is usually around a day’s work. If it finds signs of bats, further emergence surveys are needed, and a full bat survey can cost in the region of £1,000+."
- [Flood Risk Environmental - pricing](https://www.floodrisk-environmental.co.uk/pricing), read 2026-11-11: "A Flood Risk Assessment costs from £295 for a simple Flood Zone 1 site, £485–£695 for most changes of use and extensions in Flood Zone 2, and £750–£995 for higher-risk Flood Zone 3 or tidal sites."
- [Indigo Surveys - bat surveys](https://indigosurveys.co.uk/bat-surveys/), read 2026-11-10: "A preliminary roost assessment starts from £200 + VAT and is usually around a day’s work."

## Read in full, publishes no figure

- [AgLand - how much does a barn conversion cost](https://agland.co.uk/how-much-does-a-barn-conversion-cost), read 2026-11-11: every candidate on the page was refused
- [AgLand - cost of a barn conversion](https://agland.co.uk/cost-of-a-barn-conversion), read 2026-11-11: every candidate on the page was refused
- [AgLand - barn conversion cost per square foot](https://agland.co.uk/barn-conversion-cost-per-square-foot), read 2026-10-12: every candidate on the page was refused
- [AgLand - barn conversion planning costs](https://agland.co.uk/barn-conversion-planning-costs/), read 2026-11-11: every candidate on the page was refused
- [Windsor Patania Architects - barn conversions and Class Q](https://windsorpatania.com/learn/residential-developments/barn-conversion/), read 2026-09-11: every candidate on the page was refused
- [Construction Capital - barn conversion calculator](https://constructioncapital.co.uk/calculators/barn-conversion), read 2026-11-11: every candidate on the page was refused
- [Jervis Design Architects - barn conversion costs 2026](https://www.jervisdesign.com/insights/barn-conversion-costs-2026), read 2026-09-11: read in full and no accepted figure on the page
- [Urbanist Architecture - Class Q barn conversion](https://urbanistarchitecture.co.uk/barn-conversion/), read 2026-11-11: every candidate on the page was refused
- [Walters Architects - Class Q planning permission for barn conversions](https://www.waltersarchitects.co.uk/class-q-planning-permission-barn-conversion/), read 2026-09-11: read in full and no accepted figure on the page
- [AR Design Studio - Class Q conversions](https://ardesignstudio.co.uk/blog/classqconversions), read 2026-09-11: read in full and no accepted figure on the page
- [DMS Architects - Class Q barn conversion rules](https://dmsarchitects.co.uk/class-q-barn-conversion-rules/), read 2026-10-11: read in full and no accepted figure on the page
- [Foxes Rural - Class Q planning consultant](https://foxesrural.co.uk/class-q-planning-consultant), read 2026-11-11: every candidate on the page was refused
- [The Rural Planning Co - cost of planning questions](https://www.theruralplanningco.co.uk/resources/planning-faqs/cost-of-planning-questions/), read 2026-09-11: read in full and no accepted figure on the page
- [Mark Doodes Planning - planning application fees England](https://www.markdoodesplanning.co.uk/planning-application-fees.html), read 2026-09-11: every candidate on the page was refused
- [Hawkstone Developments - how much does planning permission cost in 2026](https://hawkstone-developments.co.uk/news/how-much-does-planning-permission-cost-in-2026), read 2026-11-11: every candidate on the page was refused
- [Architecture for London - architects' fees in the UK](https://architectureforlondon.com/news/architects-fees-in-the-uk/), read 2026-09-11: every candidate on the page was refused
- [MATA Architects - architect fees UK](https://www.mata-architects.co.uk/advice/architects-fees-uk/), read 2026-11-11: every candidate on the page was refused
- [Woods Architects - fees](https://woodsarchitects.co.uk/fees/), read 2026-10-11: every candidate on the page was refused
- [Arbtech - preliminary roost assessment](https://arbtech.co.uk/protected-species/bat-surveys/preliminary-roost-assessment/), read 2026-11-10: every candidate on the page was refused
- [Aware Ecology - bat surveys](https://www.awareecology.co.uk/survey-information/bat-surveys), read 2026-09-11: every candidate on the page was refused
- [Bat Surveyor - bat survey FAQ](https://bat-surveyor.co.uk/bat-survey-faq/), read 2026-09-11: every candidate on the page was refused
- [The BNG Guy - bat survey costs](https://thebngguy.co.uk/bat-survey-costs/), read 2026-09-11: every candidate on the page was refused
- [Chase Ecology - bat surveys](https://chaseecology.co.uk/protected-species/bat-surveys/), read 2026-11-10: read in full and no accepted figure on the page
- [RIDA Reports - flood risk assessment cost](https://www.rida-reports.co.uk/flood-risk-assessment/cost/), read 2026-11-11: every candidate on the page was refused
- [Air & Flood Consultants - flood risk assessment cost](https://www.airandfloodconsultants.co.uk/flood-risk-assessment-cost), read 2026-11-11: every candidate on the page was refused
- [Urban Water Engineering - flood risk assessment cost](https://urban-water.co.uk/flood-risk-assessment-cost/), read 2026-09-11: every candidate on the page was refused
- [Bury Associates - prices for topographical and measured building surveys](https://buryassociates.co.uk/prices-for-topographical-measured-building-surveys/), read 2026-09-11: every candidate on the page was refused
- [THS Concepts - measured survey costs](https://www.ths-concepts.co.uk/measured-survey-costs/), read 2026-11-11: every candidate on the page was refused
- [Mainline Surveys - topographical survey cost](https://mainlinesurveys.co.uk/survey-costs/topographical-survey-cost), read 2026-09-11: every candidate on the page was refused
- [Terrain Surveys - how much does a measured building survey cost](https://terrainsurveys.co.uk/news-and-media/how-much-does-a-measured-building-survey-cost), read 2026-10-11: every candidate on the page was refused
- [Prince Surveyors - land survey costs UK 2026](https://princesurveyors.co.uk/blog/how-much-does-a-land-survey-cost-in-the-uk-2026-prices/), read 2026-09-11: every candidate on the page was refused
- [MyBuilder - barn conversion cost guide](https://www.mybuilder.com/conversions/price-guides/barn-conversion-cost), read 2026-11-11: every candidate on the page was refused
- [MyBuilder - structural engineer costs](https://www.mybuilder.com/architectural-services/price-guides/structural-engineer-costs), read 2026-11-11: every candidate on the page was refused
- [Homebuilding & Renovating - barn conversion costs](https://www.homebuilding.co.uk/advice/barn-conversion-costs), read 2026-11-11: every candidate on the page was refused

## Methodology

Every row is a verbatim sentence read from the named source's own page through our fetch service on the date shown, hash-pinned to the stored read (the sha of the page's visible text; the raw page is mirrored to R2). 9 of the 43 named sources that could be read published a usable figure; 34 published none and are recorded as not published, never filled in; 1 could not be read (blocked, dead or unreachable) and count nowhere. The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source for each breakdown it prices, in GBP (a source's median where its page yielded several accepted sentences for one breakdown), so a page that gives figures for several breakdowns gives one for each and N counts 14 figures, never sentences; 385 candidate sentence(s) were refused by a reviewer with the reason recorded. The fuller derivation this dataset is chartered to grow into (not yet what the figures above are; they are each source's own published figure as read): one row per firm per LINE ITEM - build £/m2 by barn structure (steel portal, timber and brick, stone), architect fee basis, planning consultant fee, structural report, bat preliminary roost assessment and emergence survey, flood risk assessment, measured and topographical survey, the statutory application fee - with the published figure, whether VAT is included, the region and the date read. Across them the index computes the PRE-SPADE TOTAL: what a Class Q application costs before anyone knows whether it will be granted, which every build-cost guide omits and which, set against the flagship's per-authority approval rate, gives the figure this venture exists to publish - the EXPECTED cost of a Class Q consent in this authority, being the application cost divided by that authority's approval rate.

## Sources

- [Thomas Studio (chartered architect) - barn conversion cost UK](https://www.thomasstudio.co.uk/article/barn-conversion-cost-uk/) (the publisher's own terms; quoted for reporting and comment)
- [AgLand - how much does a barn conversion cost](https://agland.co.uk/how-much-does-a-barn-conversion-cost) (the publisher's own terms; quoted for reporting and comment)
- [AgLand - cost of a barn conversion](https://agland.co.uk/cost-of-a-barn-conversion) (the publisher's own terms; quoted for reporting and comment)
- [AgLand - barn conversion cost per square foot](https://agland.co.uk/barn-conversion-cost-per-square-foot) (the publisher's own terms; quoted for reporting and comment)
- [AgLand - barn conversion planning costs](https://agland.co.uk/barn-conversion-planning-costs/) (the publisher's own terms; quoted for reporting and comment)
- [Best Builders - barn conversion cost per m2 2026](https://www.bestbuilders.co.uk/guides/costs/how-much-does-a-barn-conversion-cost-per-m2-2026) (the publisher's own terms; quoted for reporting and comment)
- [First4Estimating - barn conversion costs UK](https://www.first4estimating.com/blog/barn-conversion-costs-uk.html) (the publisher's own terms; quoted for reporting and comment)
- [Cost Estimator - barn conversion cost UK 2026](https://costestimator.co.uk/barn-conversion-cost-uk-2026/) (the publisher's own terms; quoted for reporting and comment)
- [Peninsula Custom Construction - cost of a barn conversion in Devon](https://www.peninsulacustomconstruction.com/cost-of-a-barn-conversion-in-devon/) (the publisher's own terms; quoted for reporting and comment)
- [Ikonic Architecture - barn conversion cost guide for Norfolk and Suffolk](https://www.ikonic-architecture.co.uk/post/barn-conversion-cost-guide-for-norfolk-and-suffolk) (the publisher's own terms; quoted for reporting and comment)
- [Mosaic Bespoke - barn conversion costs and planning](https://mosaicbespoke.co.uk/barn-conversion-costs-and-planning/) (the publisher's own terms; quoted for reporting and comment)
- [Windsor Patania Architects - barn conversions and Class Q](https://windsorpatania.com/learn/residential-developments/barn-conversion/) (the publisher's own terms; quoted for reporting and comment)
- [Construction Capital - barn conversion calculator](https://constructioncapital.co.uk/calculators/barn-conversion) (the publisher's own terms; quoted for reporting and comment)
- [Jervis Design Architects - barn conversion costs 2026](https://www.jervisdesign.com/insights/barn-conversion-costs-2026) (the publisher's own terms; quoted for reporting and comment)
- [Urbanist Architecture - Class Q barn conversion](https://urbanistarchitecture.co.uk/barn-conversion/) (the publisher's own terms; quoted for reporting and comment)
- [Walters Architects - Class Q planning permission for barn conversions](https://www.waltersarchitects.co.uk/class-q-planning-permission-barn-conversion/) (the publisher's own terms; quoted for reporting and comment)
- [AR Design Studio - Class Q conversions](https://ardesignstudio.co.uk/blog/classqconversions) (the publisher's own terms; quoted for reporting and comment)
- [DMS Architects - Class Q barn conversion rules](https://dmsarchitects.co.uk/class-q-barn-conversion-rules/) (the publisher's own terms; quoted for reporting and comment)
- [Foxes Rural - Class Q planning consultant](https://foxesrural.co.uk/class-q-planning-consultant) (the publisher's own terms; quoted for reporting and comment)
- [The Rural Planning Co - cost of planning questions](https://www.theruralplanningco.co.uk/resources/planning-faqs/cost-of-planning-questions/) (the publisher's own terms; quoted for reporting and comment)
- [Mark Doodes Planning - planning application fees England](https://www.markdoodesplanning.co.uk/planning-application-fees.html) (the publisher's own terms; quoted for reporting and comment)
- [Hawkstone Developments - how much does planning permission cost in 2026](https://hawkstone-developments.co.uk/news/how-much-does-planning-permission-cost-in-2026) (the publisher's own terms; quoted for reporting and comment)
- [Architecture for London - architects' fees in the UK](https://architectureforlondon.com/news/architects-fees-in-the-uk/) (the publisher's own terms; quoted for reporting and comment)
- [MATA Architects - architect fees UK](https://www.mata-architects.co.uk/advice/architects-fees-uk/) (the publisher's own terms; quoted for reporting and comment)
- [Woods Architects - fees](https://woodsarchitects.co.uk/fees/) (the publisher's own terms; quoted for reporting and comment)
- [Arbtech - preliminary roost assessment](https://arbtech.co.uk/protected-species/bat-surveys/preliminary-roost-assessment/) (the publisher's own terms; quoted for reporting and comment)
- [Aware Ecology - bat surveys](https://www.awareecology.co.uk/survey-information/bat-surveys) (the publisher's own terms; quoted for reporting and comment)
- [Bat Surveyor - bat survey FAQ](https://bat-surveyor.co.uk/bat-survey-faq/) (the publisher's own terms; quoted for reporting and comment)
- [Indigo Surveys - bat surveys](https://indigosurveys.co.uk/bat-surveys/) (the publisher's own terms; quoted for reporting and comment)
- [The BNG Guy - bat survey costs](https://thebngguy.co.uk/bat-survey-costs/) (the publisher's own terms; quoted for reporting and comment)
- [Chase Ecology - bat surveys](https://chaseecology.co.uk/protected-species/bat-surveys/) (the publisher's own terms; quoted for reporting and comment)
- [Flood Risk Environmental - pricing](https://www.floodrisk-environmental.co.uk/pricing) (the publisher's own terms; quoted for reporting and comment)
- [RIDA Reports - flood risk assessment cost](https://www.rida-reports.co.uk/flood-risk-assessment/cost/) (the publisher's own terms; quoted for reporting and comment)
- [Air & Flood Consultants - flood risk assessment cost](https://www.airandfloodconsultants.co.uk/flood-risk-assessment-cost) (the publisher's own terms; quoted for reporting and comment)
- [Urban Water Engineering - flood risk assessment cost](https://urban-water.co.uk/flood-risk-assessment-cost/) (the publisher's own terms; quoted for reporting and comment)
- [Bury Associates - prices for topographical and measured building surveys](https://buryassociates.co.uk/prices-for-topographical-measured-building-surveys/) (the publisher's own terms; quoted for reporting and comment)
- [THS Concepts - measured survey costs](https://www.ths-concepts.co.uk/measured-survey-costs/) (the publisher's own terms; quoted for reporting and comment)
- [Mainline Surveys - topographical survey cost](https://mainlinesurveys.co.uk/survey-costs/topographical-survey-cost) (the publisher's own terms; quoted for reporting and comment)
- [Terrain Surveys - how much does a measured building survey cost](https://terrainsurveys.co.uk/news-and-media/how-much-does-a-measured-building-survey-cost) (the publisher's own terms; quoted for reporting and comment)
- [Prince Surveyors - land survey costs UK 2026](https://princesurveyors.co.uk/blog/how-much-does-a-land-survey-cost-in-the-uk-2026-prices/) (the publisher's own terms; quoted for reporting and comment)
- [MyBuilder - barn conversion cost guide](https://www.mybuilder.com/conversions/price-guides/barn-conversion-cost) (the publisher's own terms; quoted for reporting and comment)
- [MyBuilder - structural engineer costs](https://www.mybuilder.com/architectural-services/price-guides/structural-engineer-costs) (the publisher's own terms; quoted for reporting and comment)
- [Homebuilding & Renovating - barn conversion costs](https://www.homebuilding.co.uk/advice/barn-conversion-costs) (the publisher's own terms; quoted for reporting and comment)
- [Checkatrade - barn conversion cost guide](https://www.checkatrade.com/blog/cost-guides/barn-conversion-cost/) (the publisher's own terms; quoted for reporting and comment)

## Cite or embed

- The Barn Conversion Cost Index carries 14 published figures read from 9 sources' own pages; the 6 published figures given without a breakdown run from 1,200 to 2,500 GBP, read 11 November 2026.
- 9 of the 43 named sources read in full publish a figure; 34 publish none, read 11 November 2026.
- Barn Conversion Cost Index, barn_structure steel-portal: median 1,200 GBP across 1 source, read 11 November 2026.
- Barn Conversion Cost Index, barn_structure timber-frame: median 1,800 GBP across 1 source, read 11 November 2026.
- Barn Conversion Cost Index, barn_structure brick: median 1,900 GBP across 1 source, read 11 November 2026.
- Barn Conversion Cost Index, barn_structure stone: median 2,200 GBP across 1 source, read 11 November 2026.
- Barn Conversion Cost Index, barn_structure listed: median 2,600 GBP across 1 source, read 11 November 2026.
- Barn Conversion Cost Index, line_item bat-preliminary-roost-assessment: median 200 GBP across 1 source, read 11 November 2026.
- Barn Conversion Cost Index, line_item bat-emergence-survey: median 1,000 GBP across 1 source, read 11 November 2026.
- Barn Conversion Cost Index, line_item flood-risk-assessment: median 295 GBP across 1 source, read 11 November 2026.

Cite as: "classqchecker.co.uk Barn Conversion Cost Index", updated 2026-11-12, https://classqchecker.co.uk/datasets/barn-conversion-cost-index/.

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