Commercial EPC in Portsmouth

Accredited Non-Domestic Energy Assessors covering Portsmouth and the wider Hampshire area, including Gosport, Fareham, Havant. SBEM and DSM assessments, MEES-ready and lodged on the national register.

Commercial EPCs in Portsmouth: what businesses need to know

A commercial EPC in Portsmouth is a legal requirement the moment you sell, let or significantly refurbish non-domestic premises. An Energy Performance Certificate rates a building from A to G on its modelled energy efficiency, and since 1 April 2023 you cannot lawfully continue to let a commercial property in England below an EPC E. Portsmouth’s geography sharpens the point: as one of the most densely built cities in Europe, largely confined to Portsea Island, it has a tightly layered commercial estate where Georgian and Victorian premises sit alongside naval-era buildings and modern office parks, and the energy performance across that stock varies enormously.

An EPC must be produced by an accredited non-domestic energy assessor and lodged on the national register, where it remains valid for ten years. The rating, with the recommendation report that accompanies it, is the document every property decision turns on: whether an Old Portsmouth office can be re-let, whether a Voyager Park unit will sell without a discount, and what it would cost to move a building above the enforcement threshold. This page sets out when your Portsmouth premises needs a certificate, what it costs here, how the assessment works, and how to improve a poor rating.

Does your Portsmouth business premises need an EPC?

A valid commercial EPC is required in three situations, each frequent across Portsmouth.

Sale comes first. A commercial building or long lease being sold must have a valid EPC available before marketing. A Commercial Road office, a Southsea retail unit or a warehouse at Walton Road cannot lawfully be sold without one, and the rating now shapes how buyers value the property.

Letting is the second and the most common trigger for Portsmouth landlords. Granting a new lease, renewing a lease or re-letting to a new tenant all require a valid EPC, which must be E or above for the letting to be lawful. Because the minimum-E rule applies to continuing lettings rather than only new ones, a landlord holding an older Old Portsmouth building at F can be in breach without any change of tenant.

Construction or major refurbishment is the third. A new commercial building needs an EPC on completion, as does an existing one where works change its fixed services or thermal fabric. With continuing regeneration around Gunwharf, the waterfront and the city centre, this trigger fires regularly in Portsmouth. Certificates last ten years, but where works are significant, or the rating sits close to E, a fresh assessment is the safer path.

Portsmouth’s commercial property stock and why EPCs bite here

Portsmouth’s commercial estate is shaped by two forces: its dense island geography and its naval history. Old Portsmouth, the city’s original settlement, is a conservation area of around 40 hectares containing a concentration of Georgian and Victorian premises now in commercial use, and the wider city holds numerous designated conservation areas, including Conservation Area 22 covering HM Naval Base and St George’s Square. Portsmouth’s statutory list of buildings has been reviewed to give fuller representation to Victorian and Edwardian stock, and the Historic Dockyard, maintained under an ongoing conservation programme, sits at the heart of the city’s heritage footprint. Solid-walled, single-glazed buildings of this age typically return a weak EPC, and listed or conservation-area status does not remove the need for a certificate, it simply limits which improvements are permitted.

The modern market is anchored by the office parks and the defence economy. Lakeside North Harbour is Portsmouth’s premier office park, covering over 100 acres in a landscaped setting and offering high-specification refurbished office accommodation; 1000 Lakeside sits prominently opposite Junction 12 of the M27 at the gateway to the city. Portsmouth is home to the Royal Navy and to a cluster of major occupiers and defence-linked businesses, and its industrial and trade stock spreads across Walton Road, Voyager Park, the Airport Industrial Estate and Quartremaine Road. These newer buildings generally score better on fabric than Old Portsmouth, but large office floors and trade units are routinely pulled down by inefficient lighting and heating controls, so age alone does not secure a strong rating.

Portsmouth also sits within the Solent Freeport, and where commercial premises fall inside a designated tax site, enhanced capital allowances can improve the economics of energy-efficiency works. The city’s constrained island footprint means commercial space is at a premium and turnover is active, which in turn means the minimum-E rule is tested frequently: a sub-standard EPC that blocks a letting has an outsized effect where space is tight and demand steady.

MEES in Portsmouth: the minimum-E rule and what’s coming

The Minimum Energy Efficiency Standards (MEES) fix the floor for what Portsmouth landlords may lawfully let. Since 1 April 2023 the rule has applied to all commercial lettings, not only new ones: it is unlawful to continue letting a commercial property in England and Wales with an EPC below E unless a valid exemption is registered. An Old Portsmouth period building or an older trade unit rated F or G is, in enforcement terms, sub-standard, and letting it exposes the landlord to penalties.

Those penalties carry weight. Enforcement sits with the local authority, and for a breach of three months or more the penalty can reach 20 per cent of the property’s rateable value, capped at £150,000, alongside publication of the breach. For a Portsmouth office or trade building of any size, that is a material and recurring exposure rather than a single charge.

The rules are set to tighten. The government has proposed lifting the minimum standard for larger privately rented non-domestic buildings, those over 1,000 square metres, to EPC B by 2031 where doing so is cost effective. This remains proposed rather than in force: it awaits secondary legislation, and the previously expected interim EPC C milestone for 2027 has been dropped. Smaller Portsmouth premises stay subject to the EPC E minimum for now. The practical message for owners here is that a building at D or E today, particularly a larger office floor at Lakeside or a sizeable industrial unit, may need a clear improvement route to remain lettable in the 2030s, and only the EPC reveals where it currently sits.

What a commercial EPC costs in Portsmouth

There is no fixed price for a commercial EPC, because the fee follows the building. The main variables are total floor area, the number of separate heating and cooling zones, and the complexity of the services, in particular whether the building has full air conditioning or mechanical ventilation.

As a 2026 guide for Portsmouth premises:

• Small, simple units, a single Southsea shop, one office suite, a trade counter, typically fall in the region of £150 to £350.
• Mid-sized offices, retail and light-industrial buildings, such as a suite at Lakeside North Harbour or a unit on Walton Road, commonly range from around £350 to £800.
• Larger or complex buildings, a distribution or trade warehouse at Voyager Park, a multi-let office block, or anything with extensive air conditioning, generally start around £600 and can exceed £1,000 on the largest, multi-zone sites.

Two Portsmouth-specific factors move the fee. Older Old Portsmouth and inner-city buildings often lack accurate modern floor plans, and where the assessor must measure and draw the building from scratch that adds time and cost. Modern office floors at Lakeside and portal-frame units on the industrial estates are quicker to assess because their form and services are straightforward. Always get a quote that names the assessment level and confirms the assessor is accredited before you instruct.

How the assessment works

A commercial EPC is produced by an accredited non-domestic energy assessor (NDEA) registered with a government-approved scheme such as Elmhurst, Stroma, Quidos or ECMK. The assessor is qualified to a level matching the complexity of the buildings they may certify, and their accreditation number appears on the certificate.

The process runs in three stages. First, the site visit: the NDEA surveys the building, measuring floor areas by zone and recording construction, glazing, heating, cooling, ventilation, lighting and controls. Second, the calculation: the survey data is entered into approved software that models the building’s energy performance and produces the A-to-G rating and recommendation report. Most Portsmouth commercial buildings are modelled using SBEM, the Simplified Building Energy Model. A Level 3 assessment covers simpler buildings with basic services, such as a small shop or a single office, while a Level 4 assessment covers larger or more complex buildings, including those with full air conditioning, both using SBEM. The most complex buildings, with extensive glazing, atria or advanced ventilation, are assessed using Dynamic Simulation Modelling (DSM) at Level 5, an hourly whole-year simulation that produces a more accurate figure. Third, lodgement: the certificate is lodged on the national register, becoming valid for ten years and publicly searchable.

Improving a poor EPC rating in Portsmouth

If a Portsmouth building returns E, F or G, the recommendation report is the route map, and the cheapest measures usually lead. Lighting is the most dependable early win: replacing fluorescent and halogen fittings with LED and adding presence and daylight controls cuts modelled energy across offices, retail units and trade warehouses alike, and it pays back fast in the city’s older centre stock where dated lighting is widespread.

Heating and controls come next. Many period Portsmouth buildings run oversized or poorly controlled heating; adding zoning, time controls and modern thermostats, or upgrading the heat source, improves the rating without altering the fabric. Fabric measures, roof and cavity insulation on the industrial estates, or secondary glazing and draught-proofing where full replacement is not feasible, deliver larger gains at higher cost, and in Old Portsmouth and the naval-base conservation areas they may need consent that limits what is permissible. That constraint is exactly why the assessment matters on heritage buildings: it identifies improvements that are both effective and achievable rather than ones certain to be refused. Where premises fall within the Solent Freeport tax sites, enhanced capital allowances can improve the returns on qualifying works, so it is worth checking your location before committing.

Areas we cover around Portsmouth

We arrange accredited commercial EPC assessments across every Portsmouth postcode district, covering the whole of Portsea Island and the near mainland:

• City centre and island south: PO1 (city centre, Old Portsmouth, Portsea), PO5 (Southsea, Somerstown)
• Island north and east: PO2 (Stamshaw, Buckland, North End), PO3 (Fratton, Copnor, Baffins), PO4 (Eastney, Milton, Craneswater)
• Mainland and business parks: PO6 (Cosham, Drayton, Farlington, Lakeside North Harbour, Port Solent)

Beyond the districts we cover the towns that form Portsmouth’s wider commercial market, including Gosport across the harbour, Fareham and Portchester to the west, and Havant and Waterlooville to the north-east. Many Portsmouth landlords hold portfolios that span the island and the mainland, and a single assessor can survey several sites on one visit to the area.

Commercial EPC FAQs — Portsmouth

How long is a commercial EPC valid in Portsmouth? A commercial EPC is valid for ten years from the date it is lodged on the national register, with no annual renewal. Even so, if you carry out major works, or your rating sits at E and you want certainty before a letting, commissioning a fresh assessment before the ten years are up is often worthwhile, particularly given the proposed tightening of MEES for larger buildings later this decade.

Do Old Portsmouth and listed buildings need an EPC? In most cases, yes. There is a narrow exemption for certain protected buildings where minimum energy requirements would unacceptably alter their character, but it is not automatic and is often assumed incorrectly. Many listed and conservation-area premises in Old Portsmouth and around the naval base still require a valid EPC when sold or let, so an exemption should never be taken for granted. An accredited NDEA will confirm the correct position for your building.

My Portsmouth unit is rated F. Can I still let it? Not lawfully, unless you register a valid exemption. Since 1 April 2023 it has been unlawful to continue letting a commercial property below EPC E, with penalties of up to £150,000 based on rateable value. The practical route is to act on the recommendation report, LED lighting and heating controls commonly move an F into E or above at modest cost, and then re-lodge the improved certificate.

Who can produce a commercial EPC in Portsmouth? Only an accredited non-domestic energy assessor (NDEA) registered with an approved scheme such as Elmhurst, Stroma, Quidos or ECMK, and qualified to the level that matches your building. The certificate must be lodged on the national register to be valid. A domestic energy assessor cannot certify commercial premises.

Get a fixed-price quote for a commercial EPC on your Portsmouth premises through our quote form. Tell us the building type, rough floor area and postcode, and we will confirm the assessment level, the accredited NDEA and a firm fee, with no obligation.