The cost reality: what each channel actually costs per response
Every sales leader eventually asks which channel is cheaper. The honest answer is that email is almost always cheaper per touch, but telemarketing can be cheaper per qualified meeting if you are targeting the right segment. The distinction matters enormously for budget planning.
A well-run cold email sequence costs roughly £2-£8 per contact touched, once you account for data acquisition, copywriting, sending infrastructure, and CRM time. That covers the full sequence: three to five emails over two to three weeks. A live outbound call, by contrast, costs £30-£100 per connected conversation when you factor in caller time, management overhead, and the data required to reach that point. Most dial lists deliver a live connection rate of 15-30%, so the gross cost per dial attempt is lower, but the cost per real human conversation is the figure that drives pipeline economics.
The table below sets out the key benchmarks for UK B2B outbound:
| Metric | Cold Email (B2B) | Outbound Telemarketing (B2B) |
|---|---|---|
| Cost per touch | £2-£8 | £8-£25 per dial attempt |
| Cost per live contact | Not applicable (async) | £30-£100 |
| Open / connect rate | 20-40% open rate | 15-30% connect rate (live conversation) |
| Click-through / interest rate | 1-3% CTR on cold lists | 8-15% connect-to-meeting conversion |
| Cost per booked meeting | £80-£400 | £150-£500 |
| Typical sales cycle fit | Short to medium (1-9 months) | Medium to long (3-18 months) |
| Minimum viable list size | 500+ (for statistical validity) | 100+ (per campaign segment) |
| Compliance requirement (UK) | LIA, opt-out mechanism | LIA, TPS/CTPS suppression wash |
These are industry benchmarks, not guarantees. A financial services firm cold-calling FDs at mid-market manufacturers will see very different connect rates to a SaaS company calling IT managers in the public sector. The figures above represent typical mid-market B2B outbound in the UK.
When does telemarketing beat cold email on ROI?
Telemarketing wins when the deal value justifies the cost per touch, the conversation has to happen before a decision is possible, or the target audience simply ignores email at scale.
Deal size: the £20k ACV threshold
If a booked meeting costs £150-£500 and your close rate from meeting to contract is 20-30%, your cost per closed deal from telemarketing sits somewhere between £500 and £2,500. For a £5,000 annual contract that maths is uncomfortable; for a £50,000 contract it looks entirely sensible. The rough threshold in practice is an ACV of £10,000-£20,000. Below that, email sequences can generate pipeline at a fraction of the cost per closed deal. Above it, the richer qualification you get from a real conversation saves pipeline waste further down the funnel.
A Bristol-based logistics software firm targeting Operations Directors in manufacturing companies with 100-500 employees, where licences run £30,000-£80,000 per year, is a classic telemarketing-first scenario. The discovery call is essential, gatekeeping is manageable with good direct-dial data, and email alone will not shift a procurement decision at that contract value.
Audience seniority and channel preference
C-suite and VP-level buyers receive enormous volumes of cold email. Inbox management tools, assistants, and habit mean that cold email open rates to senior titles run 10-15 percentage points lower than the same email to manager-level contacts. A well-timed call to a direct-dial number, supported by a brief email sent an hour before, can cut through where email alone fails.
Conversely, technical decision-makers (developers, IT architects, data scientists) tend to find unsolicited calls intrusive and are highly responsive to well-crafted email sequences. The channel preference maps partly to seniority and partly to function. In our experience, the clearest single signal is whether the role has an EA or personal assistant: if it does, email into the senior person's inbox with a personalised subject line works, and telemarketing may require you to navigate an extra layer first.
Complex sales that require discovery
Some products cannot be sold without a conversation. Enterprise software, financial products, outsourced services, and regulated-sector solutions all need qualification that email cannot achieve. A ten-minute discovery call with a Head of Finance at a Manchester-based professional services firm yields qualification data worth 20 email exchanges: current provider, contract renewal date, budget cycle, pain point, and internal champion. That data sharpens every subsequent touchpoint, whether email, direct mail, or a second call.
When does cold email outperform telemarketing?
Email dominates when volume is high, ACV is modest, or the audience needs to self-select before engaging.
High-volume, low-ACV prospecting
If you are selling a £1,500-£5,000 annual subscription to SMEs across the UK, telemarketing economics rarely stack up. Sending a four-email sequence to 5,000 qualified SME contacts costs roughly £10,000-£40,000 (data plus send infrastructure plus copywriting). At a 2% meeting-book rate, that is 100 meetings. The equivalent telemarketing programme, at a conservative £300 per booked meeting, would cost £30,000 for the same outcome and require a team of callers over several weeks. Email wins decisively.
This is also where list quality matters most acutely. A poor-quality email list wastes only the cost of additional sends. A poor-quality dial list wastes caller time at £30-£100 per conversation attempt, which is a far more painful burn rate.
Top-of-funnel awareness and nurture
Email can reach thousands of prospects per month with content that builds recognition over time: thought-leadership articles, product updates, case studies, event invitations. Telemarketing cannot economically achieve that scale. Prospects who have seen your brand in their inbox three times before you call pick up the phone in a different frame of mind to those receiving a completely cold call.
See our article on cold email B2B rules in the UK for the compliance requirements governing this channel under UK GDPR and the Privacy and Electronic Communications Regulations (PECR).
Price-sensitive segments and digitally-native buyers
Startups, digital agencies, tech companies, and e-commerce businesses skew heavily toward email and away from phone. Their buyers are often younger, inbox-comfortable, and actively averse to cold calls. Forcing telemarketing onto a segment that prefers asynchronous communication tends to generate opt-outs and complaints, not pipeline. Read the room.
How to combine both channels: sequencing that works
The most consistent finding from UK B2B outbound data is that multi-touch, multi-channel sequences outperform single-channel programmes. Contact rates rise 30-50% when email and phone are used in combination compared with either alone. The design of the sequence matters almost as much as the choice to combine them.
Email-first sequencing (the most common approach)
The standard UK B2B playbook runs something like this:
- Email 1 (Day 1): Brief, personalised introduction. One ask only. No attachments.
- Email 2 (Day 4-5): Short follow-up referencing the first email. Add one piece of social proof (a named client or a specific outcome).
- Phone call (Day 7-8): Reference both emails in the opening line. The prospect now has a mental reference point.
- Email 3 (Day 10-12): If no call answer, send a short break-up email offering value or a clear out.
- Phone call (Day 14-15): Final attempt. If no connection, move to a nurture list.
This sequence works because the email touches build name recognition before the call, which meaningfully reduces the "who are you?" problem that kills cold calls in their first ten seconds. The call gives the prospect a channel to ask questions that email cannot answer.
Call-first sequencing (for short, targeted lists)
For lists of 50-200 high-value prospects, call-first can outperform. The opener on the call is stronger when there is no prior email ("I wanted to speak with you before sending anything over"), and the first call generates qualification data that sharpens every subsequent email. This approach demands higher data quality (direct dials, verified job titles, recent role tenure) and is not viable at scale. It works best for major-account targeting, where each prospect represents six or seven figures of potential revenue.
For a fuller treatment of outbound calling best practice, including CTPS obligations, call timing, and script structure, see our guide on B2B telemarketing best practices in the UK.
UK-specific considerations: compliance, data, and channel rules
The UK adds regulatory layers that affect how both channels can be run. Getting them wrong on telemarketing carries steeper risks than on email, because a complaint from a called party is harder to defend than an unsubscribe from an email sequence.
Telephone Preference Service and CTPS
The Telephone Preference Service (TPS) is mandatory suppression for calls to sole traders and partnerships under the Privacy and Electronic Communications Regulations (PECR). Limited companies are not legally required to be suppressed against TPS, but the Corporate Telephone Preference Service (CTPS) covers businesses that register. Washing a dial list against both TPS and CTPS costs little and prevents complaints to the Information Commissioner's Office (ICO). The ICO has issued fines to organisations that failed to run TPS checks, with penalties reaching into six figures for large-scale breaches. Do not skip this step.
Lawful basis for using the same data file for both channels
A UK B2B contact file compiled under legitimate interests from public sources supports both cold email and telemarketing outreach, provided your Legitimate Interests Assessment covers both channels explicitly. A common mistake is completing an LIA that references email only, then running the same file through a telemarketing campaign. The ICO expects channel-specific justification within the three-part legitimate interests test: purpose, necessity, and balancing. If your LIA does not mention telephone, add a supplementary section before calling begins.
For a side-by-side view of how direct mail fits alongside these two digital channels, the comparison in our article on direct mail vs email for UK B2B gives useful context on when physical post adds a dimension that neither phone nor email provides.
Compliance note
B2B data compiled under legitimate interests from public sources (Companies House filings, corporate websites, public directories) supports both email and telemarketing under UK GDPR Article 6(1)(f). Opt-out requests must be honoured for both channels independently. A prospect who unsubscribes from email does not automatically consent to being called, and vice versa; maintain separate suppression lists for each channel.
Data quality: the hidden cost multiplier
Phone-number decay in the UK B2B market runs approximately 25-30% annually, compared with 20-25% for email addresses. Decision-makers change roles frequently; direct-dial numbers change with them. A dial list that is 18 months old can easily have 40% invalid numbers, meaning callers spend nearly half their time on dead lines. For telemarketing programmes, data recency is not a nice-to-have: it directly determines caller productivity and cost per live conversation. Always verify or use a recently refreshed file. The cost saving on data rarely justifies the productivity loss on calls.