Overview
JavaScript and Rate Limiting both elevate Construction & Maintenance's active barrier profile
| Value | |
|---|---|
| WAF | 94% |
| Antibot | 21% |
| CAPTCHA | 24% |
| JavaScript | 52% |
| Rate Limiting | 29% |
| TLS | 9% |
WAF leads at 94%. JavaScript (52%) and Rate Limiting (29%) together form a multi-layer active stack — more than most sectors deploy alongside WAF.
Barrier Landscape
JavaScript is Construction & Maintenance's dominant secondary barrier by a wide margin
| Value | |
|---|---|
| WAF | 94% |
| Antibot | 21% |
| CAPTCHA | 24% |
| JavaScript | 52% |
| Rate Limiting | 29% |
| TLS | 9% |
| Has robots.txt | 75% |
| Blocks AI crawlers | 7% |
WAF at 94% and JavaScript at 52% together form the sector's main defensive layer. Rate Limiting (29%) follows at a distance. The barrier profile is concentrated rather than broadly spread.
Two-barrier stacks are Construction & Maintenance's most common security posture
| % of sites | |
|---|---|
| 0 barriers | 5% |
| 1 barrier | 25% |
| 2 barriers | 36% |
| 3 barriers | 17% |
| 4 barriers | 4% |
| 5 barriers | 13% |
| 6 barriers | 0% |
36% of Construction & Maintenance sites carry exactly 2 barriers. 34% stack three or more. 5% carry none — a low share of unprotected sites for this sector.
Construction & Maintenance is predominantly Easy to access — with a notable Moderate minority
| Mean recommended tier | |
|---|---|
| All sites | 2.04 |
A mean recommended tier of 2.04 and a median of Easy place Construction & Maintenance around the middle of the sectors surveyed. 24% of sites are Simple to access; 20% require Moderate or above.
Easy is the most common access tier across Construction & Maintenance sites
| % of sites | |
|---|---|
| 1 - Simple | 24% |
| 2 - Easy | 56% |
| 3 - Moderate | 13% |
| 4 - Complex | 6% |
| 5 - Advanced | 1% |
Easy (56%) is the most common tier. Simple and Easy together account for 80% of sites, while 13% land at Moderate and 7% at Complex or Advanced.
robots.txt
Around three-quarters of Construction & Maintenance sites publish a robots.txt
| % of sites | |
|---|---|
| Publish a valid robots.txt | 75% |
75% of Construction & Maintenance sites have a valid robots.txt. The remaining 25% leave crawl policy entirely undefined — a meaningful gap for a sector of this scale.
Construction & Maintenance sites name a handful of agents in robots.txt — few commit to comprehensive policies
| % of sites | |
|---|---|
| 0 | 26% |
| 1 | 46% |
| 2–4 | 15% |
| 5–9 | 6% |
| 10–15 | 0% |
| 16+ | 7% |
The mean of 6.7 named agents reflects limited bot-policy investment in Construction & Maintenance. 26% of sites name no agents; 46% name exactly one. Only 7% maintain a list of 16 or more named bots.
SEO audit tools and SEO / search indexing draw near-equal attention in Construction & Maintenance robots.txt
| % of sites | |
|---|---|
| AI crawlers | 10% |
| SEO / search indexing | 14% |
| SEO audit tools | 16% |
| Commercial scrapers | 7% |
| Social / content scrapers | 2% |
| Archive / research crawlers | 6% |
| Monitoring / uptime bots | 0% |
SEO audit tools appears in 16% of Construction & Maintenance sites; SEO / search indexing in 14%. The near-equal split reflects a sector that treats both categories with comparable priority. Figures are percentages of all 100 sites.
Uniform per-agent rules dominate Construction & Maintenance robots.txt files
| % of sites | |
|---|---|
| Uniform per-agent rules | 39% |
| Path-level mixed rules | 32% |
| Allow-only (no Disallow rules) | 1% |
| Mixed AI posture | 1% |
| Blanket Disallow: / | 2% |
Uniform per-agent rules lead at 39%, with path-level mixed rules at 32%. Mixed AI posture (1%) and blanket Disallow (2%) are minimal.
Yandex leads named Disallow rules in Construction & Maintenance robots.txt
| Disallowed | Allowed (whitelisted) | |
|---|---|---|
| * | 71% | 34% |
| Yandex | 7% | 3% |
| Baiduspider | 7% | 3% |
| Nutch | 7% | — |
| GPTBot | 5% | 2% |
| Googlebot | 3% | 4% |
| AhrefsBot | 5% | 1% |
| SemrushBot | 6% | — |
| MJ12bot | 5% | 1% |
| AdsBot-Google | 1% | 5% |
| proximic | 5% | — |
| YandexBot | 3% | 1% |
| MSIECrawler | 4% | — |
| SiteSnagger | 4% | — |
| Teleport | 4% | — |
| WebCopier | 4% | — |
| WebStripper | 4% | — |
| BLEXbot | 4% | — |
| CCBot | 4% | — |
| ia_archiver | 4% | — |
| PerplexityBot | 2% | 2% |
| ClaudeBot | 3% | 1% |
| 008 | 3% | — |
| bingbot | 1% | 2% |
| BLEXBot | 3% | — |
Values are percentages of all 100 Construction & Maintenance sites surveyed. The wildcard (*) leads at 71% Disallow. Among named agents, Yandex, Baiduspider, Nutch are the most frequently targeted — focused on non-AI crawlers.
Industry Cohort
Construction & Maintenance is among the hardest sub-categories to access in Construction & Environment
| WAF | Antibot | CAPTCHA | JavaScript | Rate Limit | TLS | robots.txt | Blocks AI | Tier | |
|---|---|---|---|---|---|---|---|---|---|
| Construction & Maintenance | 94% | 21% | 24% | 52% | 29% | 9% | 75% | 7% | Tier 2 |
| Ecology & Environment | 90% | 13% | 13% | 42% | 16% | 13% | 76% | 10% | Tier 1 |
A median tier of Easy and mean of 1.86 make Construction & Maintenance one of the harder sectors within Construction & Environment to access programmatically. JavaScript (52%) leads the cohort.