Commercial Mortgages Portsmouth
Office

Office Commercial Mortgages Portsmouth

Investment and owner-occupier mortgage finance for Portsmouth office property. Lakeside North Harbour at Cosham (the IBM legacy campus, around 1.5 million sq ft of Grade B) is the largest single office estate in the city, Guildhall Square anchors the central professional-services stock, Commercial Road upper floors run the small-cap city-centre office, Voyager Park serves the modern park-format occupier and Old Portsmouth carries heritage office stock. Investment LTV 65 to 75%, owner-occupier to 75% on EBITDA cover, mid-2026 rates 7.0 to 9.0% pa.

LTV

65 to 75%

Cover test

ICR 140 to 155% / EBITDA 1.3 to 1.5x

Rate range

7.0 to 9.0% pa

Facility

£300K to £10M

Underwriting a Portsmouth office commercial mortgage

Portsmouth office stock reflects the city's defence, naval, university and back-office economy. The occupier base is exceptionally varied, driven by the Royal Navy and BAE Systems Maritime Services at the naval base and shipyard, Portsmouth City Council at Guildhall Square, Queen Alexandra Hospital and Portsmouth Hospitals University NHS Trust, the University of Portsmouth and a multi-tenant occupier base at Lakeside North Harbour following the IBM consolidation. The commercial mortgage market splits four ways. Lakeside North Harbour (PO6) the dominant Cosham office campus, around 1.5 million sq ft of Grade B office space, multi-let after IBM consolidated, lender appetite is solid where covenants are intact and leases run beyond five years. Central Guildhall Square and Commercial Road upper floors (PO1), the £400K to £3M owner-occupier and small-investment bracket. Voyager Park (PO3) and modern industrial-park-format office, the smaller modern park-format occupiers along the Airport Service Road corridor. Old Portsmouth heritage office (PO1), listed and conservation-area office stock around the High Street and Spice Island.

Investment underwriting tests ICR at 140 to 155% on let office stock. Tenant covenant carries even more weight than on retail, a five-year unbroken lease to a defence supply-chain or professional-services firm prices materially better than the same building let on three two-year leases. Multi-let assets with rolling renewals price at the wider end. Owner-occupier office routes through the EBITDA-cover product at 1.3 to 1.5x, the marine consultancy buying its Old Portsmouth townhouse, the legal firm taking the freehold of its Guildhall Square office, the engineering practice buying a Lakeside North Harbour suite.

Lakeside North Harbour is a discrete sub-pool. The estate's Grade B vintage and the IBM legacy mean valuations sit below modern equivalents on a £/sq ft basis, but the multi-tenant occupier base post-IBM consolidation has produced steady refinance flow. Lenders read each Lakeside building on its own letting evidence rather than as a single campus story. Old Portsmouth heritage office needs heritage-comfortable lenders given the listed-building and conservation-area constraints on alteration.

Worked example: a Guildhall Square 5,600 sq ft office investment, £1.55M valuation, let on a 7-year FRI to a regional law firm at £108K passing rent. ICR at 145% sizes a £985K loan at 64% LTV; Lloyds, NatWest and Santander all price this profile at 7.5 to 8.0% pa on a five-year fix. Worked example two: an Old Portsmouth heritage office freehold purchase by a marine-services consultancy, £695K, EBITDA cover 1.4x. Owner-occupier route at 70% LTV places with Hampshire Trust Bank or Shawbrook at 7.5 to 8.25% pa.

Office asset types we fund

Lakeside North Harbour campus office

Lakeside North Harbour (PO6) at Cosham. The IBM legacy campus, around 1.5 million sq ft of Grade B, multi-tenant post-consolidation. Each building underwritten on its own letting evidence.

Central Guildhall Square office

Guildhall Square and the streets around Portsmouth City Council and the Civic Offices (PO1). Victorian and 1960s purpose-built stock plus continual upper-floor conversion.

Commercial Road upper-floor office

Upper floors above the Commercial Road retail spine (PO1). Small-cap office, often part of mixed-use blocks. £200K to £1M bracket.

Voyager Park modern office

Voyager Park (PO3) and the wider Airport Service Road modern park stock. B1 office and B1/B2 hybrid in modern unit format.

Old Portsmouth heritage office

High Street and Spice Island office (PO1), listed and conservation-area stock. Heritage-comfortable lenders only.

Owner-occupier office freehold

Professional services buying their building, marine consultancy, defence supply-chain, legal, accountancy. EBITDA cover route at 1.3 to 1.5x.

Finance structures for Portsmouth office

Investment routes via commercial investment mortgage on ICR; owner-occupier via the EBITDA-cover route; vacant or value-add via bridge-to-let with an agreed term-out. Serviced and licence-let stock routes through specialist desks.

Owner-occupier commercial mortgage

Where the borrower's business trades from the property, EBITDA cover at 1.3 to 1.5x.

Commercial investment mortgage

Let assets, ICR-led underwriting at 140 to 160% stressed cover.

Commercial bridge-to-let

Vacant or value-add acquisition with agreed term-out onto investment mortgage.

Commercial remortgage

End-of-fix or capital raise on existing assets.

The Portsmouth office estate

Portsmouth office stock divides into four clear clusters. Lakeside North Harbour (PO6) on the Cosham M27 corridor is the city's largest single office estate, around 1.5 million sq ft of Grade B campus office, originally developed for IBM and now multi-let following IBM consolidation; lender comfort with the campus is solid where individual buildings are well-tenanted on five-plus year leases. The central CBD around Guildhall Square (PO1) carries Victorian and 1960s purpose-built stock plus continual upper-floor conversion above Commercial Road retail, the densest professional-services freehold market in the city. Voyager Park (PO3) on the Airport Service Road corridor holds modern park-format office stock in B1 and B1/B2 hybrid units. Old Portsmouth (PO1) carries heritage and listed office stock around the High Street and Spice Island, a small but valued sub-pool with conservation-area constraints. The naval base and BAE Systems shipyard generate substantial defence supply-chain office demand that anchors the wider Portsmouth occupier base across all four clusters. The structural supply position is steady rather than stretched, central CBD owner-occupier demand outstrips speculative supply, and refinancing flow across the Lakeside estate is a meaningful share of total commercial mortgage volume.

Lender appetite for Portsmouth office

Strong on prime let stock with national covenants and unexpired lease term over five years. Mid-strength on secondary CBD with mid-covenant tenants on shorter leases. Tighter, but still fundable, on vacant or part-let secondary office routed through bridge-to-let with a credible refurbishment story. <strong>NatWest</strong>, <strong>Lloyds</strong>, <strong>Barclays</strong> and <strong>Santander</strong> compete on prime investment at 7.0 to 7.75% pa for 65% LTV with strong covenants. Hampshire Trust Bank (locally HQ'd in Hampshire, with a strong Portsmouth book), <strong>Shawbrook</strong>, Allica Bank, HTB and Cambridge & Counties cover mid-market at 7.75 to 8.5% pa. <strong>InterBay Commercial</strong>, <strong>LendInvest</strong> and <strong>Cynergy Bank</strong> handle secondary, short-lease and refurb-to-let stories at 8.25 to 9.0% pa. Lakeside North Harbour buildings with conventional FRI lettings sit on the standard panel; Old Portsmouth heritage stock routes through heritage-comfortable lenders only.

Office FAQs

Up to 75% LTV on strong-covenant let stock with five-plus years unexpired. ICR cover tested at 140 to 155% stressed. Vacant or short-lease assets cap at 60 to 65% LTV. WAULT under three years usually pulls the loan to 60% even where the building is otherwise well-let.
Yes. The Lakeside North Harbour campus has worked through the IBM consolidation cycle and the Grade B stock is materially repriced to reflect that, which has made underwriting easier rather than harder. Bridge-to-let funds acquisition plus refurbishment plus re-letting; specialists like Shawbrook, LendInvest and HTB have appetite for genuine refurbishment stories with credible exit lettings. The EPC-B 2030 deadline has if anything strengthened lender comfort with refurb plans, because it forces the upgrade work the older Lakeside stock needs anyway.
Yes, where the asset is let on conventional FRI to a single tenant or owner-occupied by a strong-covenant business. The campus is well-known to South Coast underwriters; each building is read on its own letting evidence rather than as a single Lakeside story. Above £5M the deal typically routes through structured commercial debt outside the standard broker panel.
Routes via the owner-occupier commercial mortgage. EBITDA cover 1.3 to 1.5x; LTV up to 75%; rate 7.0 to 8.25% pa for strong covenants. The accountancy or legal firm taking the freehold of its existing leased Guildhall Square or Commercial Road building is the archetypal deal, typically £400K to £1.5M facility.
Yes, but the lender pool narrows. Listed and conservation-area office around the High Street and Spice Island routes through heritage-comfortable lenders, Hampshire Trust Bank, Shawbrook, Cambridge & Counties. Slightly tighter LTV (typically 65% rather than 70%) reflecting listed-building consent constraints on alteration; otherwise comparable terms to non-listed stock. Pricing typically 7.75 to 8.5% pa at 65 to 70% LTV.

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