Most answers to this question are useless. They average together a $2 billion consumer goods company and a two-truck HVAC operation. Those businesses have nothing in common financially. Their marketing budgets shouldn’t either.

The good news: once you narrow the question to your industry and growth stage, a much clearer number appears.

Below is a realistic, data-backed breakdown by trade, plus the framework to land on the right number for your business.

The General Rule of Thumb

The U.S. Small Business Administration recommends businesses under $5 million in annual revenue allocate roughly 7-8% of gross revenue to marketing. Businesses chasing aggressive growth should push that closer to 10-12%.

Growth stage matters as much as industry:

• Early-stage or newly launched: 10-20% of projected revenue to build initial visibility
• Growing businesses: 7-10%
• Stable, established businesses with strong referral networks: 4-7%

Trade-by-Trade Marketing Spend Benchmarks

Here’s how those baselines shift once you factor in competition, deal size, and customer acquisition costs:

Home Services: HVAC, Roofing, Plumbing, Electrical

Home services contractors typically fall in the 8-12% range. In highly competitive metro markets where Google Ads and Local Services Ads costs run high, that rises to 12-15%.

For a contractor doing $1 million in annual revenue, that translates to roughly $80,000-$150,000 a year across Google Ads, SEO, local search, and reputation management.

Where you land within that range usually comes down to channel mix. Heavy reliance on paid search and Local Services Ads for immediate volume puts you at the higher end. A mature organic and referral engine (strong Google reviews, ranking content, active referral program) can bring you closer to the lower end for the same lead volume. Organic and referral leads cost a fraction of paid ones once established.

Legal Services

Legal marketing spend varies more by practice area than almost any other industry. Case value and competition differ dramatically between specialties:

Across all practice areas, established firms with strong referral networks can sustain growth at 2-5% of revenue. That’s a maintenance number, though. Firms actively trying to grow market share consistently invest 10% or more.

The data shows a clear split: high-growth firms average around 16.5% of revenue on marketing. Flat or declining firms average closer to 5%.

Retail and E-commerce

Brick-and-mortar retail typically runs 5-9% of revenue. This reflects thinner margins and heavier reliance on repeat, walk-in traffic that doesn’t require constant paid acquisition.

E-commerce businesses generally run higher at 8-12%. Every sale usually requires a fresh paid or organic touchpoint rather than foot traffic.

For an e-commerce store still building its customer base and repeat-purchase habits, the upper end (or higher during a growth push) is common and justified. The number should come down over time as email, SMS, and repeat-purchase revenue start carrying more weight than paid acquisition.

B2B Professional Services and Agencies

Professional and B2B service businesses typically invest 7-10% of revenue in marketing, rising to 10-15% for firms in growth mode or highly competitive niches.

This category relies more heavily on content, thought leadership, and referral generation than paid advertising. That’s partly why the percentage runs slightly lower than trades or e-commerce: acquisition cost per client is often lower when trust and expertise, rather than ad spend, do the heavy lifting.

How to Use These Numbers Without Overthinking Them

Benchmarks are a calibration point, not a target to hit exactly. A more reliable approach: work backward from what you’re trying to achieve.

1. Decide the revenue growth or new-customer volume you need this year.
2. Work out what a new customer is worth over their full relationship with your business. Not just the first sale.
3. Use your current (or realistically estimated) cost per acquisition to calculate how many leads or customers that spend needs to produce.
4. Compare the result to your industry benchmark. If it’s dramatically higher or lower than the range for your trade, that’s a signal: either your acquisition costs are out of line, or your growth goal needs a reality check.