February 14, 2026
TM44 Inspection Before Selling or Leasing a Commercial Property: What Buyers & Agents Check
January 11, 2026
If you’re preparing to sell or lease a commercial property and it has air conditioning, there’s one compliance document that regularly slows deals down when it’s missing: the TM44 inspection.
Buyers, commercial agents, and solicitors do not see TM44 as optional paperwork. They see it as a risk filter. If it’s missing, expired, or unclear, expect delays, renegotiation, or last-minute pressure to “sort it urgently”.
This guide explains exactly what buyers and agents check, when TM44 is required, and how to stay ahead so your sale or lease completes smoothly.
If you already want to move fast, you can request a quote here:
👉 https://tm44.uk/get-quote/
Quick answers (save this if you’re mid-deal)
Do I need a TM44 inspection before selling a commercial property?
If the building has air conditioning systems over 12kW total output, yes. Buyers and solicitors commonly ask for it during due diligence.
Do I need TM44 before leasing a commercial property?
In most cases, yes. Agents and tenants often require proof before signing a lease.
How long is a TM44 certificate valid?
Typically 5 years, unless systems are significantly changed or upgraded.
What if I don’t have an asset list?
You can still proceed. Photos and basic system details are usually enough to start.
What is a TM44 inspection and why it matters in transactions
A TM44 inspection is a statutory energy assessment of air conditioning systems in commercial buildings. It results in a TM44 report and certificate, confirming compliance and identifying efficiency improvements.
In a sale or lease, TM44 matters because it:
Demonstrates regulatory compliance
Reduces buyer and tenant risk
Prevents enforcement issues post-completion
Removes uncertainty during legal due diligence
If you want a clear overview of the register and certification process, see:
👉 https://tm44.uk/what-is-the-tm44-register/
👉 https://tm44.uk/tm44-certificate-government-lodgement/
When TM44 is required (and where owners get caught out)
TM44 applies when the combined effective rated output of all air conditioning systems exceeds 12kW.
This includes:
Multiple small split systems
Separate systems across floors or suites
Landlord and tenant systems combined
Many owners assume individual units are “too small”. In reality, systems are aggregated, and that’s where compliance is triggered.
If you’re unsure, use the AI assistant or request confirmation:
👉 https://tm44.uk/tm44-ai-assistant/
👉 https://tm44.uk/get-quote/
What buyers, agents, and solicitors actually check
This is the real-world checklist used in commercial transactions.
1) TM44 certificate and report
They want:
A current TM44 certificate
The full inspection report
Evidence it covers the entire system scope
Helpful pages:
2) Proof of legitimacy and registration
Agents and solicitors check that:
The inspection is registered correctly
The assessor is qualified
The certificate is traceable
Reference links:
3) Alignment with the asset list
A common red flag is when:
Systems on site don’t match the report
Recent upgrades are missing
Tenant systems are unclear
This creates delays and follow-up questions.
Selling vs leasing: how TM44 affects each differently
Selling a commercial property
Buyers focus on:
Compliance risk
Future upgrade costs
Negotiation leverage
A missing TM44 often becomes a price discussion, not a legal one.
Leasing a commercial property
Agents and tenants focus on:
Whether the property is lettable
Who is responsible for compliance
Avoiding enforcement after occupation
In leasing, TM44 is often required before signing, not after.
If timing is tight, fast turnaround options are available:
👉 https://tm44.uk/emergency-tm44-24-48-hour-service/
Buyer due diligence pack: what a “clean” file looks like
For smoother transactions, buyers and agents expect a compliance pack that typically includes:
TM44 certificate and report
EPC for the building
F-Gas leak testing records (if applicable)
Air conditioning service records
Clear responsibility split (landlord vs tenant)
Related services:
EPC support: 👉 https://tm44.uk/energy-performance-certificate-epc/
F-Gas compliance: 👉 https://tm44.uk/f-gas-leak-testing-compliance-checks/
MEES guidance: 👉 https://tm44.uk/mees-compliance-support/
Real-world examples we see all the time
Example 1: Retail unit in a mixed-use building
Multiple split systems installed over time. No single asset list. TM44 was arranged after the buyer’s solicitor raised queries, delaying exchange.
Example 2: Office floor being re-let
Landlord assumed an old certificate was valid. Systems had been modified during a fit-out. New TM44 required before lease completion.
Example 3: Portfolio sale
Multiple sites with different expiry dates. Portfolio inspection scheduled to align certificates and remove negotiation risk.
For multi-site properties:
👉 https://tm44.uk/tm44-portfolio-management/
What happens during a TM44 inspection
A compliant inspection includes:
System identification and review
Assessment of controls, zoning, and operation
Energy efficiency observations
Clear recommendations
Certificate production and lodgement
Full breakdown:
TM44 vs servicing vs F-Gas (common confusion)
This comes up constantly during sales.
Servicing = maintenance
F-Gas = refrigerant leak compliance
TM44 = energy inspection and legal reporting
They do not replace each other.
Clear comparison here:
👉 https://tm44.uk/news-blog/tm44-vs-f-gas-inspections-uk-2025-2026/
What if you ignore TM44 and proceed anyway?
Some deals complete without it, but the risks include:
Enforcement action and fines
Post-completion disputes
Buyer price reductions
Lease delays or withdrawals
If enforcement risk matters to you, read:
Cost, timing, and planning properly
How long does it take?
Depends on building size, system complexity, and access.
How much does it cost?
Pricing depends on:
Number and type of systems
Access requirements
Single site vs portfolio
Cost guidance:
👉 https://tm44.uk/tm44-inspection-cost-uk/
Fast quote:
👉 https://tm44.uk/get-quote/
Who is responsible: landlord or tenant?
Responsibility depends on ownership and control of the system, not just who occupies the space.
We cover this in detail here:
👉 https://tm44.uk/news-blog/tm44-legal-responsibility-landlord-tenant-managing-agent/
Simple pre-sale / pre-lease TM44 action plan
Confirm if your systems exceed 12kW
Check certificate validity
Gather basic system details or photos
Book inspection early
File the certificate in your due diligence pack
Why property owners choose TM44.uk
People come to us when they need:
Clear answers
Fast turnaround
No compliance drama during deals
We provide:
UK-wide TM44 inspections
Emergency 24–48 hour service
Portfolio and agent support
Clean reporting for transactions
Learn more:
👉 https://tm44.uk/about-us/
See our work:
👉 https://tm44.uk/portfolio/
Contact us:
👉 https://tm44.uk/contact-tm44/
Book your TM44 inspection before it becomes a deal blocker
If you’re selling or leasing a commercial property, TM44 is not something to leave until asked. Get it sorted early and keep your transaction moving.
✅ Request a quote: https://tm44.uk/get-quote/
⚡ Urgent service: https://tm44.uk/emergency-tm44-24-48-hour-service/
🏢 Multi-site support: https://tm44.uk/tm44-portfolio-management/
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1. Do I legally need a TM44 inspection before selling a commercial property?
You are legally required to have a TM44 inspection if the commercial property has air conditioning systems with a combined output over 12kW. While a sale can technically proceed without it, buyers and solicitors almost always request the certificate during due diligence, and missing it can delay or jeopardise the transaction.
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2. Is a TM44 inspection required before leasing a commercial property?
In most cases, yes. Letting agents and commercial tenants commonly ask for a valid TM44 certificate before signing a lease, especially for offices, retail units, gyms, and hospitality premises. Without it, lease completion can be delayed.
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3. What happens if my TM44 certificate has expired during a sale or lease?
If the certificate has expired, a new TM44 inspection is usually required. An expired certificate is treated the same as having no certificate at all, and buyers or agents will typically insist on an updated report before proceeding.
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4. Can a buyer or tenant refuse to proceed without a TM44 certificate?
Yes. While TM44 responsibility usually sits with the building owner, buyers and tenants can refuse to complete or sign until compliance documents are provided. In many cases, the lack of TM44 becomes a negotiation point or condition of the deal.
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5. Does TM44 apply if only part of the building has air conditioning?
Yes. TM44 applies if the total combined output of all air conditioning systems in the building exceeds 12kW, even if systems are spread across different floors, units, or tenants.
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6. Who is responsible for TM44 in a commercial lease, the landlord or the tenant?
Responsibility depends on who owns and controls the air conditioning systems. In most cases, landlords are responsible for central systems, while tenants may be responsible for systems they have installed themselves. This should be clearly documented during the transaction.
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7. Can I use air conditioning service records instead of a TM44 inspection?
No. Routine servicing and maintenance records do not replace a TM44 inspection. TM44 is a specific energy efficiency assessment with its own reporting and certification requirements, and service records alone are not sufficient for compliance.
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8. How long does it take to arrange a TM44 inspection before completion?
Timescales depend on the size and complexity of the building, but inspections can often be completed within a few days. For urgent sales or leases, emergency TM44 inspections can usually be arranged within 24–48 hours.
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9. Will a TM44 inspection affect the value of my commercial property?
Indirectly, yes. A valid TM44 certificate reduces compliance risk and removes a common objection during negotiations. Missing or outdated TM44 documentation can lead to price reductions, delayed completion, or additional conditions being added by the buyer.
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10. What documents should I prepare alongside TM44 for a smooth transaction?
For the best results, prepare a compliance pack that includes the TM44 certificate and report, EPC, F-Gas records (if applicable), air conditioning service records, and clear information on system ownership. Having these ready helps avoid last-minute issues during due diligence.
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