In-House vs Outsourced MEP Maintenance for a Factory: A Decision Guide

Most factories end up with a hybrid: an in-house team for daily operation, quick response and the machines it knows, and an outside contract for specialist, periodic and statutory-test work. Pure in-house suits a large, single-site plant with stable demand. Pure outsourcing suits a small plant, or one without technicians it can retain. The table sets out the trade-offs.

Side by side

Decision rules by asset type

• Daily operation: DG sets, pumps, utilities rounds, LT panels. Usually in-house, because speed and presence matter more than specialist depth.
• HT substation, transformers, relay testing. Often outsourced or hybrid, because the work needs calibrated test equipment and trained staff for a few visits a year. The factory still holds the inspection duties under the safety regulations: regulation 5(3) of the CEA (Measures relating to Safety and Electric Supply) Regulations, 2023 requires a factory with more than 250 kW connected load to designate an Electrical Safety Officer, so confirm with your inspectorate who may be named.
• Fire systems. Weekly and monthly checks can be in-house; periodic testing, hydrant and sprinkler servicing and records for renewal are commonly given to a specialist. See our fire-fighting system AMC checklist.
• Chillers and large HVAC. Hybrid is common: operators in-house, overhauls and diagnostics by the manufacturer or a specialist (chiller maintenance services).
• Solar, BMS and ELV. Usually outsourced, because monitoring and tuning require specific tools; see the solar O&M and performance page.
• Lifts and statutory-inspected equipment. Outsourced to licensed agencies in most plants.

The legal points of outsourcing

If outside workers come to your site, the Occupational Safety, Health and Working Conditions Code, 2020 (in force from 21 November 2025, as the government announced) matters. Its contract-labour Part applies to an establishment in which fifty or more contract labour are employed, or were employed on any day of the preceding twelve months (section 45(1)). If you are above that, welfare facilities are the principal employer's job (section 53). Employing contract labour through a contractor who needs a licence but lacks one is deemed a contravention (section 54), and if the contractor does not pay wages the principal employer must pay and recover from the contractor (section 55(3)).

Section 57 prohibits contract labour in "core activities" of an establishment, with a proviso that allows it where the activity is ordinarily done through a contractor, does not need full-time workers for the major part of the day, or involves a sudden rise in work. A core activity is the one the establishment is set up for and any activity essential or necessary to it. Building services in a factory are usually not the manufacturing activity, but the line can be argued, so take advice from your labour counsel and check the state rules in force. Under the same definition, sanitation, security and canteen services are not treated as essential unless the establishment is set up for them. None of this is legal advice; it is a prompt to ask before you sign.

Compare the cost fairly

Owners often compare a technician's salary with an AMC fee and stop there. That leaves out most of the real cost on both sides. For an in-house team, add recruitment and attrition, training and licences, tools and test instruments, spares and consumables, overtime and cover for leave, and the time of the manager who supervises. For an AMC, read the exclusions: which spares are included, whether breakdown calls are in the fee or charged on top, what is outside working hours, and what happens to a repair that exceeds a set value.

Then add the cost nobody puts on a spreadsheet: a breakdown that lasts a day longer than it should. Ask your production head what an hour of stoppage costs on the line that depends on each system, and weigh the response times of each option against it. A cheaper arrangement that responds in a day can cost more than a dearer one that responds in two hours. This is a method, not a rule; the answer depends on your plant.

How to run a hybrid so it works

1. Start from an asset register. List every asset with location, make, capacity and age. Without it neither side can price or schedule.
2. Split by task, not by trade. In-house does rounds, readings and first response; the contractor does periodic servicing, tests and diagnostics.
3. Write the interface. Who raises a call, who approves spend, what response time applies, and who holds spares.
4. Measure the same things. Planned-maintenance completion, breakdown hours, repeat faults and response times, reported monthly.
5. Keep the records. The log books, test certificates and manuals belong to the factory and should be in its hands, not only the contractor's.

The checklists in what an AMC contract should contain and the MEP AMC RFQ template help you write the contract. For the money side, see lifecycle AMC economics; the MEP maintenance budget calculator gives a first budget for either option, so you can compare total cost, including the cost of management time, not only the fee.

How Secured Engineers helps

We provide MEPF maintenance contracts, so we are not neutral on whether to outsource, and the table above is how we would want a buyer to judge it. We design in-house, and file Fire NOC, CEIG and DISCOM filings in-house, which means our maintenance team works from drawings and approvals we know. MEPF and solar can sit under one contract, from our Noida (Delhi NCR) and Ludhiana offices. The company has delivered 535+ projects across 18+ states, with 89.77% repeat clients. If you want to keep your own team, we can price only the specialist systems.

See the AMC and maintenance page, then send your asset list or current AMC on WhatsApp, call +91 70099 85817, or use a free proposal to ask for a review of your current set-up and scope.