Decision guides

Decisions, not measures

The measure pages say what each thing does. These are the four decisions that sit either side of that, and each one has two defensible answers. Which one is right depends on your building, so the pages argue both sides rather than selling one.

A building floor plan on a desk with a measuring tape, a light meter and a laptop, with nobody present. — Illustrative image generated with AI. Not a photograph of a building we have worked on.

Swap the lamps or Replace the fittings Cheaper, and it moves the certificate less than it moves the bill. Move now or Wait Decided by operating hours far more than by the wattage difference. Buy it outright or Fund it Finance costs money across a short payback. Ownership is the longer question. One building at a time or A dated programme Across an estate the binding constraint is the calendar, not the measures.

One page each, and what only that page says

The line under each is the thing that page covers and no other page on this site does.

4 entries

Lamp swap or new fittings The cheaper option saves energy and underdelivers on the certificate. Here is when that matters. This is the decision where the cheaper option saves real energy while delivering noticeably less on the certificate, because the modelled efficiency depends on the whole fitting rather than on the lamp inside it. Read LED against fluorescent Hours, not watts. The same comparison gives opposite answers in a 9-to-5 office and a 24-hour shed. The comparison is decided by operating hours rather than by the wattage difference, so an identical pair of fittings produces a sound business case in one building and a poor one in another. Read Funding the work The route you choose decides who owns the fittings, which decides what happens at lease end. The funding route determines who legally owns the installed equipment, which determines whether the improvement is still the landlord’s asset when the lease ends and whether it can be removed. Read Planning across a portfolio Across an estate the constraint is the calendar, not the measures. Across a portfolio the binding constraint is the sequence of lease events and budget years rather than the merits of any measure, so the deliverable is a dated schedule rather than a specification. Read

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