How to Quote and Run a Retail Shop Lighting Installation

What you will learn

• Why the site survey must happen before any pricing, and what to measure at each stage of a retail installation.
• How to structure a four-layer lighting specification - ambient, task, accent, and architectural - that survives value engineering.
• Which British Standards govern retail lighting compliance: BS 7671, BS 5266, and Part L of the Building Regulations.
• How to sequence procurement so luminaire lead times do not become programme delays.
• Where retail lighting projects lose margin and how your quotation process prevents it.
• What a compliant handover pack for a retail lighting installation must contain.

Retail lighting projects sit in an awkward space for electrical contractors and lighting businesses. The brief usually arrives late, the shopfitter is already on site, and the client wants the store open before they understand what they've asked for. Getting from first call to a signed quote that protects your margin requires knowing the specification before you can write the price - and knowing the site before you can write the specification. This guide covers the full workflow: survey, specification, quote, procurement, installation, commissioning, and handover.

Step 1: Understand the Brief Before You Quote

Most retail lighting briefs arrive as one of three things: a floor plan with no lux targets, a brand guide with colour temperature requirements but no electrical drawings, or a vague instruction from a shopfitter to "sort the lighting out." None of these is enough to price from.

Before you can produce a quote, you need to establish five things. First, what retail sector is this? A fashion boutique, a grocery unit, a pharmacy, and a hard-discount retailer all have different lighting requirements, and getting the colour temperature wrong at specification stage costs the client money and you credibility. A warm 3000K scheme looks inviting in a boutique but reads as dingy in a discount environment. A cool 5000K scheme that works for a supermarket feels clinical in a fashion environment. Second, what are the zoning requirements - sales floor, till areas, fitting rooms, back-of-house, stockroom, and entry? Each zone has different lux targets. Third, is there an existing installation to work with, or is this a shell unit? Shell units in managed retail environments often have landlord electrical provisions you must connect to, and deviating from them triggers landlord approval processes. Fourth, what controls does the client need? Part L of the Building Regulations requires presence detection or daylight sensors on new and replacement lighting installations - this is not optional. Fifth, who else is on the project? Shopfitters and fit-out contractors affect when you can access the site, when the ceiling void is open, and when you can fix and test.

Step 2: Carry Out the Site Survey

1. Measure the floor plate of each zone and note ceiling heights. Retail ceiling heights vary between a shell unit (often 3-5 metres) and a unit with a suspended ceiling in place. Ceiling height determines luminaire selection for ambient and accent layers.
2. Audit the existing electrical installation. Record the supply capacity (single-phase or three-phase), the location of the distribution board, and the rating of existing circuits. For food retail with refrigeration, the electrical load calculation changes significantly and your quote must reflect it.
3. Take lux measurements if there is an existing installation. The SLL Code for Lighting (2022) sets minimum maintained illuminance for retail sales areas at 300 lux. Till and service counter areas require 500 lux. If the existing scheme is underperforming, document it - this is part of your justification for the specification and it protects you from scope disputes later.
4. Check the emergency lighting provision. Under BS 5266, retail premises require maintained emergency lighting on escape routes with a minimum of 1 lux at floor level and anti-panic lighting in open areas. Many older retail units have emergency fittings that have not been tested or re-lamped in years. Identify what is compliant and what is not, and price accordingly.
5. Photograph the ceiling structure, the cable routes, and any landlord equipment you need to work around. Managed retail environments - shopping centres and retail parks - typically have strict rules about cable management and fixings into the structure.
6. Identify access constraints. Trading hours restrictions are common in retail environments. If the unit is already trading and you are carrying out a like-for-like LED upgrade, you may need to phase the work across multiple overnight sessions. This affects your labour pricing and must be reflected in the quote.

Step 3: Produce the Lighting Specification

Retail lighting works in four layers, and your specification must address all four if the scheme is to perform as the client expects.

Ambient lighting is the base layer that provides uniform background illumination across the sales floor. The SLL Code for Lighting sets a maintained illuminance target of at least 300 lux for retail sales areas with a uniformity ratio of at least 0.5 across the floor plate.

Task lighting handles the areas where higher illuminance is required for specific activities. Till areas, customer service counters, and stockroom picking areas all require 500 lux. Fitting rooms are a particular case: fitting room lighting has a direct impact on purchase decisions, and a well-specified fitting room is one of the cheapest interventions a retailer can make to reduce returns.

Accent lighting draws attention to product displays, featured bays, and new arrivals. This layer requires track systems or directional spotlights and should be specified with a Colour Rendering Index (CRI) of 90 or above and a colour deviation of three SDCM or fewer. For apparel, food, and cosmetics, CRI at this level is a commercial requirement, not a decorative one. A CRI of 80 looks acceptable but tends to mute reds and skin tones. A CRI of 90 or higher reproduces colour the way the customer expects, which affects both basket size and return rates.

Architectural lighting covers facade elements, signage illumination, and any brand feature visible to customers entering the store. For multi-site retailers, consistency in architectural lighting across the estate is a brand standard.

For the specification document itself, define the following parameters for every luminaire type:

• Colour temperature in Kelvin (and tolerance, typically ± 150K)
• CRI minimum (CRI 80 as a general minimum; CRI 90 or above for colour-sensitive zones)
• Colour consistency in SDCM (three or fewer for accent and display areas)
• Maintained illuminance target per zone
• Uniformity ratio
• Unified Glare Rating maximum (UGR ≤ 22 for general retail; ≤ 19 for task areas)
• LED module rated life (L90 at 50,000 hours as a minimum)
• Control protocol (DALI-2 is the most widely supported addressable protocol for retail)

This level of specification protects you from substitution risk. A quote produced from a vague performance summary gives a competitor the room to win on price by specifying cheaper fittings that technically meet the numbers but perform differently in practice.

Step 4: Build and Price the Quote

Once the specification is complete, build your bill of materials from it. For each zone, calculate the number of luminaires required to hit the lux target using photometric data from your supplier. Do not price from product data sheets alone - request IES or LDT photometric files and run a lux calculation. A quote based on photometric calculations is defensible; one based on a fixture count from a floor plan is not.

Your quote should include the following line items as separate positions:

• Survey and specification (if chargeable)
• Luminaires by zone and type
• Emergency lighting fittings and gear
• Control gear - sensors, DALI drivers, control panels
• Containment, cable, and wiring materials
• First and second fix labour (split separately so scope changes can be priced cleanly)
• Testing and commissioning
• Certification and documentation
• Any access equipment or plant required for the installation

Labour pricing for retail is affected by the access constraints you identified in the survey. Night working, working in a trading environment, and installing in a managed retail scheme all add cost. Price these as separate line items or make the assumptions explicit in your quotation notes. Assumptions that are not stated in the quote become scope disputes once the project is on site.

Phasing is a significant variable. A single-phase LED upgrade of an existing scheme can run overnight. A new-build shell fit-out is phased with the shopfitter's programme - you will have a ceiling void access window, a first fix phase, and a second fix phase that may be weeks apart. Your quote must reflect the programme structure. If you are not sure how the fit-out programme is structured, ask before you price.

Step 5: Manage Procurement

1. Confirm specification approval with the client or designer before placing any purchase orders. A specification that has not been formally approved is a risk - the client or their designer can change fittings after you have committed to procurement, and recovering the cost of rejected stock is difficult.
2. Place purchase orders with sufficient lead time. For standard commercial LED fittings, two to four weeks is typically adequate. For specified or designed luminaires, confirm actual lead time with the supplier at quote stage, not at order stage.
3. Track delivery against your installation programme. If you are working to a shopfitter's first fix window, late deliveries of luminaires are not recoverable from the programme without additional cost.
4. Check every delivery against your purchase order before signing the delivery note. Retail lighting projects often involve multiple luminaire types across multiple zones. Checking the delivery at receipt prevents short deliveries from becoming installation-day problems.

Step 6: Install and Commission

1. Confirm the installation sequence with the shopfitter. Ceiling void access for cable installation typically happens during first fix. Luminaire installation and connection happens during second fix once the ceiling is fixed and finished. Confirm both windows are in the programme before you sign the contract.
2. Install containment and draw cables during the first fix window. Any work in the ceiling void must be completed before the ceiling is closed. Returning to the ceiling void after a retail ceiling has been installed is expensive and time-consuming.
3. Install and connect luminaires, controls, and emergency fittings during second fix. For DALI systems, commission the control protocol before you close out the second fix so any addressing issues can be resolved while you still have full access.
4. Test the installation. BS 7671 - the IET Wiring Regulations (Amendment 4, April 2026) - requires insulation resistance testing, continuity testing, and a polarity check before the installation is energised. Test results must be recorded and form part of the electrical certification.
5. Commission the control system. DALI addressing, sensor calibration, and scene programming should be completed and tested before handover. If the client has specified a time-schedule (store open, trading, close), programme and verify it with the client present at commissioning.
6. Test the emergency lighting installation. BS 5266 requires that emergency fittings are tested on installation. Record the duration test result, the date, and the name of the person who carried out the test. This is the first entry in the emergency lighting log the client will need to maintain going forward.

Step 7: Handover and Documentation

A compliant handover for a retail lighting installation includes the following items.

Electrical certification - an Electrical Installation Certificate (EIC) or, for additions and alterations to an existing installation, a Minor Electrical Installation Works Certificate (MEIWC), completed to the current edition of BS 7671.

Emergency lighting commissioning record - the initial duration test result, signed and dated, for every emergency fitting. Required by BS 5266 and forming the baseline for the client's ongoing test log.

Luminaire schedule - a room-by-room list of every fitting installed, including manufacturer, model reference, wattage, and colour temperature. For phased or multi-site projects this document is essential for replacement ordering.

Control system record - DALI addresses, zone allocations, scene settings, and sensor locations. Without this, any future modification or fault diagnosis starts from scratch.

O&M information - installation instructions, driver data, and maintenance intervals for each luminaire type.

Emergency lighting test schedule - a blank log sheet for the client to record their monthly functional test and annual full-duration test results. Handing this over at completion reduces the number of calls you receive from clients who have failed an insurance or landlord audit.

Where Retail Lighting Projects Lose Margin

Retail lighting projects lose margin in four places. First, changes to the luminaire specification after purchase orders are placed. Build a formal approval step into your process before you order anything.

Second, programme slippage on the shopfitter's side. If the shopfitter's ceiling is delayed, your second fix is delayed, and your labour has to be rescheduled. Establish in writing what happens to your programme if the shopfitter slips.

Third, underpriced access. Overnight rates, travel time, and the cost of working in a live trading environment are routinely underpriced by contractors who have not scoped the access requirements properly. Price the access, not just the installation.

Fourth, incomplete testing and certification at handover. Returning to site for a reinspection because the original certification was incomplete is dead cost. Build testing time into your programme and complete the certification before you leave site.

The Carbon Trust estimates that lighting accounts for around 20% of the electricity used in commercial and industrial buildings. Every retail lighting project is therefore an energy compliance story as well as an installation project. Contractors who understand the specification, price it completely, and deliver it with documented certification are the ones who get called first for the next site. For further background on specifying commercial lighting, see the related guide on how to quote and run an architectural lighting project, and visit the retail lighting industry page for more sector-specific context.

Sources

• LED Lighting for Retail EnvironmentsMD Govier Electrical Engineering · accessed 2026-08-15
• Ultimate Guide to Specifying Commercial LED Lighting in the UKLumenloop · accessed 2026-08-15
• Lighting Guide 17: Lighting for Retail PremisesCIBSE / Society of Light and Lighting · accessed 2026-08-15
• CRI 80 vs CRI 90 for Retail: Which Lighting Is Best?Hyperlite · accessed 2026-08-15
• High Streetwise: SLL's Guide to Retail LightingCIBSE Journal · accessed 2026-08-15

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