Compiled: 28 September 2026 (Europe/London). All figures are from public FOI/open data, company results, NHBC, HBF, Commons Library / Senedd Research, or trade press quoting filings. No numbers invented; null + gap notes where missing.
panel2-nhbc-capacity.json — NHBC registrations vs bond-related disclosurespanel3-time-to-adoption.json — time-to-adoption benchmarks & proxiespanel4-financial-stress.json — profit, net debt/cash, bond exposure, stress flagspanel5-council-heatmap.json — LA unadopted roads / FOI / GIS heat mapdata.json, nhbc-bonds.json, vistry-overview.json, sources.md, nhbc-sources.md, vistry-sources.md# Panels 2–5 sources
Compiled: 28 September 2026 (Europe/London).
All figures are from **public** FOI/open data, company results, NHBC, HBF, Commons Library / Senedd Research, or trade press quoting filings. **No numbers invented**; null + gap notes where missing.
## Files
- `panel2-nhbc-capacity.json` — NHBC registrations vs bond-related disclosures
- `panel3-time-to-adoption.json` — time-to-adoption benchmarks & proxies
- `panel4-financial-stress.json` — profit, net debt/cash, bond exposure, stress flags
- `panel5-council-heatmap.json` — LA unadopted roads / FOI / GIS heat map
## Reused existing datasets
- `data.json`, `nhbc-bonds.json`, `vistry-overview.json`, `sources.md`, `nhbc-sources.md`, `vistry-sources.md`
## Every source URL used in panels 2–5 (and reused inputs)
1. https://assets-eu-01.kc-usercontent.com/b723cf1a-4431-01a8-d7d9-e86d570da038/9de5f82c-8079-449a-9a0d-5cb0c5c1ec09/SFCR%20Report-2526.pdf
2. https://assets-eu-01.kc-usercontent.com/b723cf1a-4431-01a8-d7d9-e86d570da038/c444b960-1837-4643-b5bf-93dce2cdd277/roadandsewerbonds-termsandconditions.pdf
3. https://beta.southglos.gov.uk/list-of-streets/
4. https://brochures.keepmoat.com/keepmoat-annual-report-2025/71117995/123
5. https://brochures.keepmoat.com/keepmoat-annual-report-2025/71117995/63
6. https://brochures.keepmoat.com/keepmoat-annual-report-2025/71117995/99
7. https://cdn.bellway.co.uk/plc/private/reports-presentations/2025/bellway-plc-annual-report-and-accounts-2025-xpplgyjdllek.pdf
8. https://cdn.bellway.co.uk/plc/private/reports-presentations/2026/2026-08-11-August-Trading-Update-Final-dqmxdcvjujcd.pdf
9. https://commonslibrary.parliament.uk/research-briefings/sn00402/
10. https://constructionwave.co.uk/2026/01/07/profit-margin-squeeze-prompts-bloor-homes-to-review-costs-and-overheads/
11. https://corporate.crestnicholson.com/media/3upkdacr/hy26-interim-statement-website-version-clean.pdf
12. https://corporate.crestnicholson.com/media/beyhyvyx/prelims-2025-for-website-final.pdf
13. https://durham1-prd.gosshosted.com/article/36781/Inventory
14. https://gis.brighton-hove.gov.uk/server/rest/services/Hosted/Unadopted_Public_Highway/FeatureServer/0
15. https://maps.norfolk.gov.uk/arcgis/rest/services/services/highways_tablets/MapServer/36
16. https://research.senedd.wales/research-articles/a-brief-journey-around-unadopted-roads-in-wales/
17. https://shareprices.com/rns/barratt-redrow-full-year-2026-results-8r2tmyva1s4ysn9/
18. https://www.barrattredrow.co.uk/news/2026/fy26-trading-update
19. https://www.barrattredrow.co.uk/~/media/Files/B/Barratt-Developments-V2/documents/annual-report-2025/barratt-redrow-plc-annual-report-and-accounts-2025.pdf
20. https://www.berkeleygroup.co.uk/-/media/migration/berkeley-group/about-us/investors/annual-report/annual-report-2025.ashx
21. https://www.berkeleygroup.co.uk/-/media/migration/berkeley-group/about-us/investors/investor-information/results-and-announcements/2026/30th-april-2026-full-year-results-announcement.ashx?hash=C82D6167257B5AF98CE419318C6C5CED&rev=83f92fb5374d4110ba252441ac7ecbeb
22. https://www.croydon.gov.uk/streets-roads-and-transport/adopted-and-unadopted-streets-and-highways/highway-gazetteer
23. https://www.dover.gov.uk/Corporate-Information/Freedom-of-Information/Freedom-of-information-Disclosure-Log/Responses/FI17046.aspx
24. https://www.edinburgh.gov.uk/roads-pavements/statutory-list-public-roads
25. https://www.gov.uk/government/consultations/reducing-the-prevalence-of-private-estate-management-arrangements/reducing-the-prevalence-of-private-estate-management-arrangements
26. https://www.hbf.co.uk/documents/14114/HBF_Slow_lane_to_adoption_report.pdf
27. https://www.hbf.co.uk/news/communities-face-decade-long-waits-for-roads-to-be-taken-on-by-local-authorities/
28. https://www.hbf.co.uk/research-insight/slow-lane-to-adoption-2026/
29. https://www.housingtoday.co.uk/news/cala-slips-into-the-red-following-one-off-20m-building-safety-remediation-cost/5143944.article
30. https://www.housingtoday.co.uk/news/morris-homes-reduces-losses-as-it-eyes-build-to-rent-expansion/5140080.article
31. https://www.insidermedia.com/news/midlands/avant-homes-posts-resilient-operational-performance
32. https://www.investegate.co.uk/announcement/rns/persimmon--psn/full-year-results/9465799
33. https://www.investegate.co.uk/announcement/rns/taylor-wimpey--tw./half-year-results-2026/9697075
34. https://www.landecon.cam.ac.uk/cambridge-centre-for-housing-and-planning-research/project/performance-bonds-highways-and-water
35. https://www.leeds.gov.uk/parking-roads-and-travel/street-register
36. https://www.millerhomes.co.uk/-/media/corporate/corporate-26/quarterly-financial-report-for-the-3-months-and-6-months-ended-30-june-2026.pdf
37. https://www.millerhomes.co.uk/corporate/news/2026/march/record-full-year-results-underscore-success-of-miller-homes-growth-strategy
38. https://www.mjgleesonplc.com/media/11xbnc3y/mj-gleeson-ar-2025.pdf
39. https://www.mjgleesonplc.com/media/h3ahspi3/mj-gleeson-preliminary-announcement-june-2025-final.pdf
40. https://www.nhbc.co.uk/warranties/road-sewer-bonds
41. https://www.pendle.gov.uk/info/20077/roads_highways_and_pavements/179/unadopted_streets
42. https://www.persimmonhomes.com/corporate/media/news/2026/full-year-results-2025
43. https://www.persimmonhomes.com/corporate/media/news/2026/half-year-results-for-the-six-months-ended-30-june-2026
44. https://www.persimmonhomes.com/corporate/media/t2ejxi3y/persimmon-plc-annual-report-2025.pdf
45. https://www.rbwm.gov.uk/council-and-democracy/strategies-and-policies/freedom-information/information-requests/foi002669-foi-highways-development-control
46. https://www.rotherham.gov.uk/downloads/file/4815/highway-asset-management-plan-pdf-
47. https://www.suffolk.gov.uk/asset-library/councillor-assets/foi-responses/26878-Unadopted-roads.pdf
48. https://www.taylorwimpey.co.uk/-/twdxmedia/Files/Head-Office/Corporate/Annual-Reports/2025/Taylor-Wimpey-Annual-Report-and-Accounts-2025.pdf
49. https://www.taylorwimpey.co.uk/-/twdxmedia/Files/Head-Office/Corporate/Reports-and-Presentations/2026/TW-FY2025-FY-Statement-Final.pdf
50. https://www.theyworkforyou.com/wrans/?id=2025-02-10.30464.h
51. https://www.vistry.co.uk/media/press-releases/2026/half-year-results-2026
52. https://www.vistry.co.uk/media/press-releases/2026/trading-update-july-2026
53. https://www.vistry.co.uk/~/media/Files/V/vistry-group-v1/press-releases/vistry-group-plc-fy25-results-4-march-2026.pdf
54. https://www.vistry.co.uk/~/media/Files/V/vistry-group-v1/results-and-presentations/2026/vistry-group-plc-half-year-results-2026.pdf
55. https://www.vistrygroup.co.uk/sites/vistrygroup/files/2025-04/ara-2024-25-all-spreads-v1.pdf
56. https://www.whatdotheyknow.com/request/highways_maintained_at_public_ex
## Panel data-point counts (summary)
- **Panel 2:** {'industry_metrics': 5, 'companies_with_bond_gbp': 5, 'companies_with_bond_per_home': 5, 'companies_total': 14}
- **Panel 3:** 11 national/sector benchmarks; 10 LA examples; 2 builder-specific rows
- **Panel 4:** {'companies': 14, 'with_net_position': 10, 'with_bond': 5, 'with_stress_flags': 8, 'chart_points': 5, 'stress_flag_items': 17}
- **Panel 5:** {'authorities_listed': 22, 'authorities_with_numeric_value': 15, 'england_and_london': 12, 'wales_entries': 8, 'scotland_entries': 1, 'with_builder_links': 1, 'notes': ['Wales national 25,374 km is stock mapping, not new-estate s.38 backlog alone.', 'Norfolk 651 km includes all GIS-classed unadopted roads, not only recent estates.', 'Suffolk 331 is FOI sites >3 years old — strongest builder-linked proxy in this set.']}
## Biggest gaps
1. **No NHBC-only company bond £m** and no industry outstanding Road & Sewer Bond face value.
2. **No builder KPI** for average months completion → s.38/s.104 / bond release; DfT holds no LA averages.
3. **Bond £m absent** for most majors; **net debt/cash absent** for several private builders (Bloor, Cala, Morris, Avant).
4. **England-wide unadopted inventory missing**; LA metrics not standardised; builder names rare outside Suffolk FOI.
5. **Scotland/NI** thinly covered vs England/Wales.