The terraced house we recently bought has a lean-to conservatory (built
1974, according to the paperwork) across the whole of the back. The garden
is at the edge of this, although there is a concrete shed (with concrete
asbestos roof) at one end. At the other end, there is a shared passageway,
which is uncovered next to the conservatory itself.

What's a good, cost effective, access method for those regular sort of jobs
(cleaning windows, clearing gutters/etc) that require getting to the
first floor and above of the original house?

s
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Selah