Following the professional builder's restoration of the fabric and structure of St Albans South box, including the external paintwork, concluded in early 2008, we started repainting the exterior in 2012. But the wet weather that year defeated us, and the external repaint was concluded in 2013 by employing a professional painter. We have to keep touching up odd bits, particularly at the south (staircase) end as this gets the worst of the prevailing wind, rain and sun, plus wear and tear on the stairs handrail. We expect to do a further complete external repaint probably 5 years after the last, ie in 2018.
The internal paintwork was done in 2008 entirely by our volunteers. The interior paintwork of the operating (1st) floor was cleaned and repainted mainly by one of our volunteers over the past Winter. We expect to repeat the exercise 'as and when' required, but probably not for another 7-8 years. The ground floor paintwork, where we have our museum display, is in reasonable order and gets a 'spring-clean' with a vacuum cleaner most years.
External brickwork: Examine yearly for loose pointing etc. It is very possible that the box was built with lime mortar but more recent repairs/repointing have been carried out with a cement mortar. Wherever/whenever possible, replace the cement mortar with lime mortar.
Roof/rainwater goods (ie gutters/downpipes) Check yearly for slipped/broken slates on the roof. Check gutters and downpipes (and associated drains) twice a year in Spring and after leaf-fall has ended for blockages, leaks etc. Repair any leaking gutter joints ASAP to minimise damage by water.
Have a look at https://www.historicengland.org.uk/images-books/publications/
- Historic England publish a lot of useful advice on the maintenance of historic buildings, often downloadable as a PDF file.
Best wishes in your endeavours - we'd be happy to entertain a party from your group at St Albans South, I'm sure!