How Long Does a Mold Inspection Take in Boston?

What the inspector actually does on the day

It starts at the door with questions rather than equipment. What do you smell and where. When did it start. What has the roof done lately. What work has been done on the house in the last few years. Has anything leaked and did anybody dry it. An inspector who samples before asking those questions is guessing expensively.

Then, usually, outside. The roof line read from the sidewalk, the gutters, where the downspouts actually discharge, the grade against the foundation, the areaway and its drain, the bulkhead, the base of the porch columns, the dormer cheeks and the valleys. Water in a Boston house nearly always arrives through a detail visible from the street or the yard.

Inside, the tour follows the water. In the cellar that means the top of the wall, the sill, the joist ends where they sit in a masonry pocket, the base of the plumbing stack, the ceiling under the kitchen and bathroom and the floor around the drain. Upstairs it means ceiling edges on the top floor, the knee-wall hatch, closets on exterior walls, window heads and anywhere a previous owner painted a single patch.

Instruments come out where the questions point. A moisture meter reads what a surface is holding. A thermal camera, which some inspectors carry, sees no mold at all; it sees temperature, which is how a wet band inside a wall gives itself away. Photographs get taken throughout, since the report has to be readable by somebody who was never there.

A few things get asked of you before the visit. Leave the suspect area alone: no bleach, no scrubbing, no fresh paint over the stain, because all three destroy the evidence somebody is coming to read. Keep windows shut for a few hours beforehand if sampling is likely, since a room aired out that morning returns a reading of the street. Clear a path to the cellar wall and the bulkhead stairs. Find out in advance who holds the key to anything locked.

Why a multi-family takes longer than the same floor area

Three doors are the difference. The inspector needs the cellar plus any unit the moisture touched. In a rented unit the occupant is entitled to notice. In a Cambridge or Somerville condo the cellar key may sit with a trustee or a management agent who works days. Storage cages get padlocked. Attic hatches get painted shut.

The fix is not to hurry the inspector. It is to line up access before the appointment exists. One afternoon with the cellar, the top unit and the affected unit all open is worth more than two half-visits a week apart. It usually costs less as well.

It also produces a better report. Moisture is a path rather than a spot. An inspector who can follow it from the roof through a ceiling into a wall cavity in a single pass writes something a trustee or an adjuster can act on. An inspector who saw one room writes about one room.

Ask the other occupants early rather than late. In an owner-occupied three-decker in Dorchester or Quincy the neighbors usually want to know what is happening in the cellar, since whatever is down there is under their floor too. A call a week ahead tends to produce three open doors. A text the night before produces one.

The part you wait on

If samples are taken they go to a lab where a person reads each one under a microscope. That is the wait and it is measured in days rather than hours. Rush handling exists and it costs more. Some inspectors send a field report with photographs and readings first, then follow it with the lab pages when they arrive.

Ask two things before samples leave the house. How long the lab is running this week, since that number moves. And whether the written report will include the inspector's reading of the results, because a table of spore counts with no interpretation is not much use to anybody.

If nothing is sampled, the report can land within a day or two of the visit. Plenty of inspections end that way, especially when the problem is visible and the source is obvious. Not sampling is a legitimate outcome and you should not be charged for a lab that was never used.

Fitting the whole sequence into a purchase

Buyers in Greater Boston work inside a short inspection period between an accepted offer and the purchase and sale agreement. The entire sequence has to land inside it: booking, the visit, the lab time and enough hours left over to decide what to ask for. That is a tight fit and it is why the call goes out the day the offer is accepted rather than the day a general home inspection turns something up.

Tell the inspector the deadline on the first phone call. They can say whether the lab turnaround fits and whether sampling is worth doing at all under that calendar. If it does not fit, the options are asking the listing side for earlier access or having your attorney extend the date in writing. Neither is unusual around here.

What you have at the end

A finished report names the source, shows it in photographs and records what was measured and where it was measured. It also separates what stops the water from what cleans up the damage, which are frequently two different trades and sometimes two different payers.

That document outlives the visit. It goes to a contractor for a quote that answers something real, to a condo board that has been told the roof is fine, to an adjuster who was not there or into a drawer for the next time somebody asks how long that stain has been on the ceiling.