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How to Choose Negative Keywords Without Losing Good PPC Searches
By Blackbird Marketing
Trade businesses should choose negative keywords by separating searches they genuinely cannot serve from searches that are simply unfamiliar, broader than expected or still worth testing. The safest approach is to use real search-term data, exclude clear mismatches first, and review the effect on leads before adding wider terms.
In short: exclude obvious non-customer intent, not words that merely look different from your usual service wording. Every negative keyword should have a clear reason, an understood match type and a review date.
What negative keywords are meant to do
A negative keyword tells an advertising platform not to show an advert for searches containing a specified word or phrase, according to the negative match type used. It is a filtering tool for paid search, not a replacement for good campaign structure, relevant landing pages or sensible location settings.
For a trade campaign, the clearest exclusions are usually searches for something the business does not sell, does not repair, does not supply or cannot reasonably respond to. For example, a business advertising boiler installation may decide that searches for boiler training courses, spare parts or DIY instructions are not suitable enquiries.
That decision cannot be copied safely from another business. A word such as “cheap”, “emergency”, “commercial”, “replacement” or “quote” may be unsuitable for one company but commercially important to another. The right negative list reflects the actual service, job type, customer and area the campaign is intended to reach.
Start with the search terms report, not a generic list
The search terms report shows the wording people used before clicking an advert. It is more useful than importing a long list of supposed industry negatives because it reflects the campaign, advert, bidding settings and customer language in front of you.
Review the report in groups rather than judging every query in isolation. Look for repeated patterns such as employment searches, training, definitions, research, products for sale, unrelated industries or services outside the business’s scope.
Classify each search before excluding it
A simple classification makes the decision less subjective:
Clearly irrelevant: the search cannot lead to the advertised service, such as a request for a course when the business only provides installation.
Potentially relevant: the wording is broad, but the person could still need the service. This may deserve a new advert group or landing page rather than an exclusion.
Relevant but unqualified: the service is right, but the search suggests a poor fit on budget, property type, location or urgency. Check the commercial value before blocking it.
Unclear: there is not enough evidence yet. Record it, inspect the landing-page behaviour and avoid an irreversible decision based on the wording alone.
This distinction matters because a search can be expensive without being irrelevant. If it describes the correct service but produces weak leads, the answer might be better advert copy, clearer pricing language, a qualifying form question or a different landing page.
Use a reason for every exclusion
Keep a short negative keyword register with the term, match type, date added, reason and campaign affected. This prevents old assumptions being forgotten and makes it easier to reverse a decision when the service offer changes.
A useful reason is specific: “excludes training-course enquiries from installation campaign”. A weak reason is “low quality” because it does not explain whether the problem was irrelevant intent, poor location, low budget, duplicate traffic or an issue with follow-up.
Choose the negative match type carefully
Negative keywords are not simply a list of words to paste into an account. The match type controls how widely the exclusion can apply, so a broad negative can remove searches that contain a valuable service phrase as well as the unwanted term.
Negative broad match
A negative broad term can prevent an advert when the search contains all of the words in that negative term, even if the order is different. It is useful when the combination itself is clearly unsuitable, but risky when individual words have several meanings.
For example, excluding a clearly irrelevant combination such as “plumbing evening class” is more controlled than excluding “plumbing” because it appeared in one unsuitable search. The first describes the unwanted intent; the second could remove genuine service searches.
Negative phrase match
Negative phrase match is useful where a particular wording should be excluded when it appears in that order. It can protect against a recognisable phrase while leaving some searches containing the individual words available.
Check how the platform applies punctuation, close variants and wording changes rather than assuming every similar query will be covered. If the unwanted intent appears in several different forms, add only the variations supported by the search data.
Negative exact match
Negative exact match is the narrowest option. It blocks the specified search rather than every search containing related words, making it appropriate when one query is clearly unsuitable but the wider wording could still produce a useful enquiry.
Use it when you are not confident that a broader exclusion is safe. A narrow exclusion may require more maintenance, but that can be preferable to losing valuable searches in a small or high-value trade campaign.
Separate service exclusions from qualification decisions
Not every undesirable search should become a negative keyword. The key question is whether the search is for the wrong thing or for the right thing under conditions the business may not accept.
Wrong service
If the campaign is for roof repairs, searches for roofing apprenticeships, roof tile suppliers or roof design software may be genuine searches, but they are not repair enquiries. These are stronger candidates for exclusion if the business does not serve those needs.
Right service, different job value
A search for “small electrical repair” may be less attractive to a contractor focused on larger projects, but it is not automatically irrelevant. Before excluding it, consider whether the job is profitable, whether it can lead to further work and whether the campaign is explicitly positioned around larger installations.
Right service, different customer type
“Commercial electrician” may be unsuitable for a domestic-only business, or it may be a valuable opportunity for one that serves shops, offices or landlords. Do not treat trade language as a universal negative; match it to the actual customer and job type.
Right service, wrong location
Location problems are often better handled through campaign location settings and location exclusions than through a long list of town names. A negative keyword for a place name may also block a useful search where someone is comparing service areas, travelling to a property or describing a brand or project.
Review the platform’s location option as well as the search wording. Decide whether the campaign targets people physically in an area, people showing interest in it, or another available setting, then make that choice consistent with the business’s real coverage.
Words that need extra caution in trade PPC
Some terms appear in both valuable and unsuitable searches. They should usually be tested in context rather than added to a shared negative list automatically.
“Cheap” or “cost”: may indicate poor fit, but it may also be a genuine customer trying to understand affordability.
“DIY”: can signal a request for instructions, but some people use it while deciding whether they need professional help.
“Parts” or “supplies”: is unsuitable for a service-only business, but may be relevant if supply and installation are offered.
“Emergency” or “24 hour”: should only be excluded where the business does not handle urgent work. Otherwise, improve the advert and landing page so availability is clear.
“Jobs”, “salary” or “career”: are often appropriate exclusions for a customer-lead campaign, provided they are not part of a recruitment campaign.
“How to”, “meaning” or “definition”: can indicate research rather than buying intent, but the phrase should be checked against the service and campaign objective.
Do not create a negative simply because a query includes a word that does not appear in the advert. Customers may describe the same job using different terminology from the business. The search term report should show whether that variation is actually causing a problem.
Use campaign-level and account-level exclusions with care
An account-level negative list can save time when a term is irrelevant across every campaign. However, it also creates the largest risk because one service may legitimately target wording that another service should avoid.
Keep exclusions at campaign or ad-group level when the decision depends on the service, customer or landing page. A term such as “commercial”, “repair”, “installation” or “training” may be wrong in one campaign and valuable in another.
Before applying a shared list, check every active and planned campaign. Ask whether the negative still makes sense for each service, including campaigns that may be added later. A central list should contain only terms that are consistently and demonstrably unsuitable.
Test the effect before expanding the list
Negative keyword work should be treated as controlled account maintenance, not a one-off clean-up. After adding exclusions, compare the search terms, qualified enquiries and spend with the previous period, while allowing for normal changes in demand, bids, budgets and landing pages.
Do not judge success only by a lower cost per click. Removing cheap but irrelevant clicks can be useful, but removing expensive clicks that become good enquiries would be a poor trade. Where tracking allows it, assess lead quality and completed commercial actions rather than clicks alone.
Set a review point for each significant change. If a negative was added because of one ambiguous search, use a narrow match type first and check whether similar valuable wording has disappeared. If the exclusion caused a problem, remove or narrow it rather than adding more exceptions around a broad negative.
Questions to ask during a review
Did the excluded term represent the wrong service, or simply a different way of describing the right service?
Was the query genuinely unqualified, or did the advert and landing page fail to set expectations?
Could the search belong in a separate campaign with different wording and budget?
Has the business’s service offer changed since the negative was added?
Would a customer use this wording when looking for a profitable job?
These questions help prevent an account becoming technically tidy but commercially too narrow.
Make the landing page part of the decision
Negative keywords cannot fix every poor PPC result. If relevant searches are arriving on a page that does not clearly describe the service, area, job type or next step, the problem may be the page rather than the keyword.
For example, a broad search might be worth keeping if the landing page can explain which jobs are accepted and which are not. A separate page may be more appropriate where one campaign is trying to speak to several distinct services or customer types.
Blackbird Marketing publishes that its website service uses a review, plan, build and launch/improve process, and describes its websites as SEO-ready. That is relevant here as a practical reminder: when keyword decisions repeatedly expose gaps in service wording or page structure, review the destination as well as the PPC settings.
For a trade business considering whether its website or landing-page structure is helping paid search visitors take the next step, the published comparison of website redesigns and landing pages is a relevant internal reference.
A practical negative keyword workflow
Define the campaign’s boundary. Write down the exact service, customer type, job type and location being targeted.
Collect actual search wording. Use the search terms report and record queries that generated clicks, costs or enquiries.
Mark the intent. Separate wrong service, research, recruitment, product shopping, location mismatch and potentially valuable service searches.
Choose the narrowest sensible exclusion. Prefer a specific phrase or exact query where a broad word could also describe a real customer need.
Record the reason. Note why the term was excluded, where it was applied and what evidence supported the decision.
Check other campaigns. Make sure a campaign-level or shared exclusion will not remove valid searches elsewhere.
Review commercial effect. Look at qualified enquiries and relevant search coverage, not just click volume or average CPC.
Revisit after changes. Recheck the list when the service, location, landing page, budget or target customer changes.
This process is slower than importing a large industry list, but it is less likely to block the exact wording a potential customer uses when looking for help.
When specialist PPC support is worth considering
It may be sensible to get help when several services share similar wording, lead tracking is incomplete, campaigns use account-wide exclusions, or the business cannot tell which searches produced worthwhile enquiries. The useful question is not simply whether someone can add negatives, but whether they can connect search intent, campaign structure, landing pages and lead quality.
Blackbird Marketing lists PPC for Trades among its services, alongside SEO and digital marketing for tradespeople. If negative keyword decisions are part of a wider problem with attracting the right service searches, the published business website service information can also be considered when the destination page needs clearer commercial structure.
Before instructing any provider, ask how they will protect relevant searches, how exclusions will be recorded, what conversion evidence they will review and how you can approve changes that affect the campaign’s coverage. The answer should be specific to the service and customer you actually want.
Need a better destination for trade enquiries? When PPC searches are relevant but the page does not make the next step clear, review the website alongside the keyword settings. Discuss the business website service with Blackbird Marketing.
