The short version
A useful spider inspection record has five parts: where you looked, what you found (spider, web, egg sac, shed skin or droppings), what it looked like, a photo, and the date. Written in one place, those notes tell a pro whether you have a nuisance web builder or a species that needs attention, and they show whether treatment is working.
- Record location, evidence type, description, photo and date for every finding.
- Web shape and placement identify spider groups better than body color does.
- Photograph any spider you suspect is a black widow or brown recluse before disposal.
- A dated log shows whether activity is rising, stable or falling after treatment.
- Hand the log to pros so quotes address the rooms and evidence you found.
- Research: In its January 2025 U.S. cost guide, Local quotes vary; ask for a written estimate.
For homeowners and renters who keep seeing spiders and want the pattern before spending money, for property managers who need a dated record of what was found in a unit, and for anyone who found a spider they suspect is medically significant and wants a good photo of it before it is thrown away.
What to look for
The second problem is identification. Most household spiders are harmless, but widow and recluse spiders are worth confirming, and both are frequently misidentified. A clear photo with a size reference, a note on where it was found, and a description of the nearby web is usually enough for a pro or an extension office to make the call. Without a record, spider problems get described in feelings: there are a lot, they are everywhere, they are getting worse. A pro hearing that starts from zero, and the quote reflects a general perimeter service rather than the rooms and evidence in your home. After treatment, you have no baseline, so you cannot tell whether four spiders in a month is an improvement.
- 1Fresh webs rebuilt in the same corners within days.
- 2Silk egg sacs on ceilings, in closets or under furniture.
- 3Small shed exoskeletons near baseboards and window frames.
- 4Dark pin-sized droppings on sills and walls below webs.
- 5Spiders in sinks and tubs most mornings.
- 6Webs across door frames you walk through daily.
Why it’s worth acting soon
- Egg sacs hatch and one spider becomes dozens in a closet or garage.
- A medically significant species goes unconfirmed and unaddressed.
- Pros quote a generic service because no specifics were recorded.
- You cannot tell whether treatment worked without a baseline.
- Tenant complaints in multi-unit buildings pile up with no dated record of what was found.
in the U.S. are the black widow and brown recluseMedically significant spidersUS CDC Treatment options and typical costs
Room-by-room inspection walk
No cost: DIY step
Check every room, the basement, attic access, garage and exterior with a flashlight. Look at corners, behind furniture, under sinks, in window tracks and along eaves. Log every finding as you go.
- Time
- One to two hours for a typical home
- Best for
- Building the first complete picture of where spiders live
Findings log with photos
No cost: DIY step
One line per finding: date, location, evidence type, description, photo filename. A phone photo with a coin for scale is worth more than any written description.
- Time
- Two minutes per finding
- Best for
- Turning sightings into evidence a pro can use
Species identification review
$0–$100
Send your best photos to a pro, a county extension office or a university entomology program. Many identify from photos at no charge. Keep the specimen in a sealed container if possible.
- Time
- One to three days for a reply
- Best for
- Confirming or ruling out widows and recluses
Professional inspection and written report
$75–$200, often credited toward treatment
A pro walks the home with your log, confirms or adds findings, and writes up locations and recommendations. Ask for the report so you can compare it to other quotes.
- Time
- 45 to 90 minutes
- Best for
- Getting a trained set of eyes on your findings
Targeted treatment plan
$150–$400 for an initial visit
Dewebbing, egg sac removal, crack-and-crevice application and exterior work aimed at the locations in your record. Your log becomes the checklist for what the visit should cover.
- Time
- One to two hours
- Best for
- Addressing the rooms and hiding spots your log identified
Prices are typical published ranges. Ask what’s included before you compare quotes.
Lidded plastic bins beat open boxes and loose piles for keeping spiders out of stored clothes and bedding.A record format that works on paper or a phone.
Date. Location, as specific as you can: master bath, behind toilet, floor level. Evidence type: spider, web, egg sac, shed skin, droppings. Description: size compared to a coin, color, markings, and for webs the shape and whether it is dusty or fresh. Photo filename. Action: vacuumed, left in place, captured. Add a second section for the exterior with the same fields, noting the side of the house and the nearest fixture, door or vent. A few descriptions do most of the identification work. A flat circular web with spokes outdoors is an orb weaver, harmless. A messy tangle in a ceiling corner is a house spider or, with very long thin legs, a cellar spider, both harmless. A sheet with a funnel into a crack is a funnel weaver, harmless. A strong, irregular, sticky web low in a dark corner with a shiny black spider hanging upside down is a widow. Fast-running spiders with no web are usually wolf spiders or, in the south-central states, possibly recluses. Date every entry. The pattern over weeks is what matters. Use one line per finding with six fields.
Where to look during the inspection walk.
In basements and crawl spaces, check ceiling joists, the sill plate where the foundation meets the framing, behind stored items and around pipe penetrations. Garages: the door frame corners, behind and under shelving, inside rarely used boxes, and around the water heater. Ground floor: window tracks, behind the toilet, under sinks, behind the refrigerator and washer, and the top corners of closets. Upper floors and attics: closet corners, the attic hatch, and around recessed lights. Outdoors, walk each side. Look at eaves and soffit corners, every light fixture, the meter box and utility penetrations, window wells, deck undersides, firewood, and anything stacked against the house. Bring a flashlight even in daylight and shine it at a low angle across surfaces; silk shows up far better in raking light. A small mirror helps under sinks and behind appliances. Do not clean as you go on the first walk. Record everything first so you have a true baseline, then vacuum webs and sacs afterward and note on each line that you removed it. Indoors, start at the lowest level.
Leaf piles against the foundation are prime fall shelter for spiders looking for a way inside.Using the record with pros and after treatment.
Ask each the same questions: which findings concern you most, what would you look for that I may have missed, and how will your plan address the rooms on the list. Good answers name your rooms and evidence: the sill plate findings suggest entry from the exterior, or the closet sacs mean an indoor population that needs crack-and-crevice work, not just a perimeter spray. Ask for the company's own inspection findings and staple them to your log. If they found sacs in an attic you did not check, that is useful. If they list rooms you inspected closely and found nothing, ask what they saw. After treatment, keep logging in the same format for at least two months and count sightings per week in each room. A working plan shows a steady decline in the rooms that were worst. A plan that is not working shows the same rooms at the same rate, and your log gives you a clear basis for a follow-up call or for switching pros. Property managers should keep one log per unit and one for common areas. Send your log and best photos to two or three pros before anyone visits.
What affects the price
- Whether an inspection fee is credited toward treatment.
- Number of rooms and outbuildings with recorded activity.
- Presence of a confirmed widow or recluse population.
- Amount of clutter that must be moved for access.
- Attic, crawl space and basement accessibility.
- One-time treatment versus a recurring service plan.
When to call for help
Call a pro when your log shows sightings in three or more rooms, when you find egg sacs indoors, when spiders appear in beds or clothing, or when any photo could be a widow or recluse. Widows are shiny black with a red hourglass underneath and build strong, irregular webs low in dark corners and meter boxes. Recluses are uniform tan with a violin mark and six eyes, found in undisturbed storage in the south-central United States. Send the log and the three clearest photos. A good pro comments on the specific findings and asks about the rooms you listed. If they quote without asking about your record, keep looking.
What you can do yourself
If sightings in your worst room drop from twelve a month to two, the plan is working. Give them your record, ask them to add to it, and keep logging after treatment. A pro earns their fee when the log shows activity spreading, when sacs keep appearing in living areas, when the species is a widow or recluse, or when a building has multiple units reporting. A month of logging often shows the problem is one room and one cause. Keeping the record is entirely on you, and many minor situations resolve with the steps the log points to: vacuuming webs and sacs, sealing the window track where they keep appearing, and reducing clutter in the corner they favor.
Simple ways to keep spiders away
- Vacuum webs and egg sacs weekly in rooms with recorded activity.
- Seal gaps at window tracks and door sweeps you noted in the log.
- Store items in lidded plastic bins rather than open cardboard.
- Keep beds and furniture a few inches off walls in problem rooms.
- Shake out shoes, gloves and stored clothing before use.
- Reduce indoor insects, which are the food supply, with screens and sanitation.
Under-sink cabinets get checked for gaps around pipes, which spiders and their prey both use.Did you know?
Spider silk is produced by spinnerets at the rear of the abdomen.
Widow spiders hang upside down in their webs, exposing the hourglass.
Recluse spiders have six eyes; most other spiders have eight.
Questions people ask
What should I write down when I find a spider?
Date, exact location, what you found (live spider, web, egg sac, shed skin or droppings), a short description with size and color, and a photo filename. If there is a web, note its shape: flat orb, messy tangle, funnel or sheet. That one line is enough for a pro to place the finding.
How do I photograph a spider for identification?
Put a coin or ruler beside it, get the camera as close as it will focus, and take one shot from above and one from the side. If it is dead, flip it to photograph the underside, where the widow hourglass sits. Good light and a steady hand beat a zoomed-in blurry shot.
Can a pro identify a spider from a photo?
Usually, for the common groups and for widows. Recluse identification from photos is harder because several harmless brown spiders look similar, so a pro may ask for the specimen. County extension offices and university entomology labs also identify from photos or mailed samples, often at no charge.
Should I keep the spider I found?
If you suspect a widow or recluse, yes. Trap it under a cup, slide paper beneath, and put it in a sealed jar or bag in the freezer. A specimen settles questions that photos cannot. For ordinary house spiders, a photo is enough.
How long should I keep logging before calling someone?
Two to four weeks gives a clear pattern for a nuisance problem. sooner if you find egg sacs indoors, spiders in bedding, or a possible widow or recluse. The log you have so far is still useful, even if it only covers a few days.
Does the log help with a quote?
Yes. A pro who sees that activity is concentrated in the basement and one bathroom can quote a targeted visit rather than a whole-home program. It also lets you compare quotes fairly, because every pro is responding to the same documented findings.
Is monthly spider control worth it?
In Record Inspection Findings, most spiders are harmless and beneficial, so the goal is usually to remove the webs and egg sacs and reduce the insects they feed on. In Record Inspection Findings, only the black widow and brown recluse are medically significant in the U.S., and they are identified by their markings.
Does every house have spiders?
Nearly, based on the best available room-by-room study. When Bertone and colleagues searched 50 volunteer homes in North Carolina in 2012, they found spiders, alive or dead, in every single one. Finding a spider is not the same as an infestation. A few spiders in corners or a basement is normal. Large numbers, egg sacs, or venomous species are the signs that justify a closer look.
Sources (6)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Spider Exterminator · Updated September 11, 2026 · How we write these guides