Keeping a record of changes to an older house

A change log is a short, dated record of the work done on a house, kept with the photographs, receipts and plans that support each entry. Its purpose is practical. A future owner, a builder or a conservation specialist can see what was altered, when and with which materials, instead of guessing from the surfaces. The habit takes a few minutes per project, and the cost of skipping it tends to appear later, when a wall must be opened to find out what is behind it.

Start with a simple change log

A spreadsheet or a dated document is enough. Give every entry the same fields so the record is easy to search and compare. Useful fields include:

• the dates the work started and finished
• the room, floor or part of the building affected
• a plain description of the work and the reason for it
• who carried it out, with business name and contact details where available
• the materials used, including product names, paint color names and codes, and mortar mixes
• permit numbers, inspection dates and the outcome of each inspection
• where the supporting photographs and receipts are stored

Make each entry while the work is fresh, ideally within a week of finishing, because memories of dates and materials fade quickly. Include small jobs as well as large ones, such as a repaired sash cord or a repainted shutter. Over time, accumulated small work shapes an older house as much as any major project. Keep one master log in one place, and avoid spreading entries across notebooks, phone notes and email threads.

A maintenance record belongs beside the change log. It holds the dates of routine checks rather than alterations: the roof covering, gutters and downpipes, chimney flashing, the sealant around windows and doors, and any repointing or painting of the masonry. Noting the date of each check makes it obvious when a task has fallen overdue, and it keeps an annual inspection from being forgotten. A change log explains what was done to a house, while a maintenance record shows how it has been kept, and together they explain why the house looks the way it does.

Photograph before, during and after

Photographs are the most durable evidence of work that will later be hidden. Take them before demolition starts, from the same positions you would use for the finished room, so that before and after images line up. During the work, photograph framing, wiring runs, pipe routes, insulation, subfloors and anything else that will be covered by plaster, drywall or flooring before the surface closes. Place a tape measure or ruler in the frame to show scale, and label each file with the date and room.

Hidden work is the most valuable to document. Knowing where a wire runs or what insulation sits inside a wall saves time and money for the next person who opens it. Keep the original image files rather than only the smaller copies sent to phones or messaging apps, because the originals keep capture dates and detail. Back up the photographs using the widely recommended three-two-one approach: three copies of each file, on two different kinds of storage, with one copy kept away from the house.

Keep receipts, plans and product details together

Paperwork often outlasts memory. Keep receipts and invoices, product data sheets, warranty cards and manufacturer instructions in one folder or binder for the house. For paint and finishes, record the exact product name, the sheen and the color code, since a repainting job years later depends on matching the original. Note tile batch numbers, grout colors and mortar recipes used in historic repairs, because a different mix can change how a wall takes up and releases moisture.

Plans and sketches matter as well. A simple as-built sketch showing new walls, outlets, radiators and drain lines helps anyone who later works on the house. Store lab reports from lead or asbestos testing with the rest of the paperwork, along with permit records and final inspection certificates. Unpermitted work can complicate a sale or an insurance claim, and the local building department can explain what its records show for a property. Keep digital copies of everything, and a paper set in a dry place away from heat and direct light.

Systems deserve their own page in the file. Record the location of the water and gas shut-off valves, the electrical panel and any hidden access panels, along with the installation year of the boiler, water heater and roof covering where the data plates or invoices show it. Sketch where the main drain lines and supply pipes run through the floors. Anyone who needs to reach a valve in an emergency will be glad the location is written down rather than remembered.

When the house changes hands, hand over the record as a complete set. A binder with a clear index, an up-to-date change log and a folder of dated photographs turns the house's past into something the next owner can use. The same record helps the current owner, because it shows what was done, when, and what still needs attention.