Commercial Mortgages Portsmouth
Cosham and Lakeside North Harbour office park and high street

Commercial Mortgages Cosham and Lakeside North Harbour

Cosham is the PO6 mainland gateway, the first commercial district north of Portsea Island once a driver clears the M275 viaduct and the A27. The fabric is the largest office park on the South Coast, Lakeside North Harbour on Western Road, the IBM-legacy 1.5 million sq ft Grade B office cluster now multi-tenant after IBM's footprint contraction, anchored alongside Queen Alexandra Hospital, the dominant Portsmouth Hospitals University NHS Trust acute site, and the Cosham High Street district retail centre. We arrange commercial mortgages for Lakeside North Harbour Grade B office investment and owner-occupier floors, Queen Alexandra Hospital ancillary healthcare and dental and clinic freeholds, Cosham High Street retail parade investment and owner-occupier independents, and the wider PO6 trading-business and care-home corridor stock. Indicative terms inside 48 hours.

15 active commercial property listings currently tracked in Cosham and Lakeside North Harbour.

The Cosham and Lakeside North Harbour commercial property market

Cosham is the PO6 mainland gateway into Portsmouth, the first commercial district north of the M275 viaduct off Portsea Island. The commercial fabric is unusually concentrated for an outer Portsmouth ward and runs across three distinct sub-markets. Lakeside North Harbour on Western Road carries the largest single office park on the South Coast at around 1.5 million sq ft of Grade B office space, the legacy IBM campus that, since IBM's footprint contraction, has gradually re-leased as multi-tenant Grade B office stock with active reconfiguration and refurbishment programmes running through 2025 and 2026. Queen Alexandra Hospital on Southwick Hill Road anchors the Portsmouth Hospitals University NHS Trust acute footprint and pulls a substantial ancillary cluster of dental practices, private clinics, GP surgeries and care homes through the surrounding PO6 wards. Cosham High Street and the district retail centre carry a deep independent and small-multiple retail and F&B parade alongside the standard suburban professional-services and convenience fabric.

Most Cosham and Lakeside commercial mortgage deals run in the £500K to £5M facility bracket, with the largest at Lakeside North Harbour reaching £8M+ on whole-floor or whole-building Grade B office investment freeholds. Lakeside Grade B office investment currently prices at 7.0 to 8.5% pa at 60 to 70% LTV through Allica Bank, HTB, Shawbrook and Cambridge & Counties on let stock, with stronger-covenant single-tenant floors at the tighter end. Owner-occupier professional firms buying their own Lakeside or Cosham office floor price 6.5 to 8.0% pa at 70 to 75% LTV through Allica Bank, HTB and YBS Commercial. Queen Alexandra Hospital ancillary healthcare freeholds, dental and private clinic, price 6.5 to 8.0% pa at 70 to 80% LTV through Hampshire Trust Bank and Allica Bank's health desk on NHS contract value plus EBITDA. Cosham High Street retail and F&B sits at 7.0 to 8.5% pa at 65 to 75% LTV.

HM Land Registry residential transactions across PO6 confirm a stable family-housing demographic with a strong NHS, MoD and professional-services resident base. The PO6 semi-detached and detached stock supports the affluent professional catchment that drives Lakeside professional-services demand and Queen Alexandra ancillary healthcare consumer demand. They are not direct commercial signals, but they underwrite the tenant covenant assumptions on Cosham High Street retail and the Lakeside owner-occupier office buyer profile. Refinancing of maturing 5-year fixes from 2020 and 2021 is the dominant 2026 product flow across the corridor, with Lakeside Grade B office investment particularly active as 2020 acquisitions reach end-of-fix into a more cautious office investment market.

Recent commercial planning activity in Cosham and Lakeside (PO6)

Three live Portsmouth City Council public access portal files anchor the current Cosham and Lakeside commercial mortgage pipeline. The Lakeside North Harbour office park reconfiguration (Ref 26/00098/FUL) covers refurbishment of IBM-legacy Grade B office floors for multi-tenant occupation at Lakeside North Harbour, Western Road PO6 3EN, the canonical Lakeside refurbishment scheme that supports new owner-occupier and let-investment underwriting as floors come back to market. The Cosham High Street retail parade refurbishment (Ref 25/02012/FUL) covers frontage works and new F&B accommodation in the Cosham district centre at Cosham High Street PO6 3AB, the live district-centre asset management activity that funds either as owner-occupier independent retail at 6.5 to 8.0% pa at 70 to 75% LTV or as parade investment at 7.0 to 8.5% pa at 65 to 75% LTV. The Queen Alexandra Hospital ancillary healthcare scheme (Ref 25/01875/FUL) covers a new dental practice and private clinic accommodation in the Cosham healthcare cluster at Queen Alexandra Hospital, Southwick Hill Road PO6 3LY, the live ancillary healthcare freehold pipeline that we place through Hampshire Trust Bank and Allica Bank health desk on NHS contract value plus EBITDA. Stamp duty applies at the commercial rates on each freehold purchase, refinancing is unaffected.

Active commercial property types in Cosham and Lakeside

Lakeside Grade B office investment

Multi-tenant Grade B office investment freehold and ground lease at Lakeside North Harbour on Western Road, post-IBM reconfiguration stock.

£1M to £8M facility

Lakeside owner-occupier office floor

Professional firms and SME headquarters buying their own Lakeside Grade B office floor of 3,000 to 10,000 sq ft.

£600K to £3M

Queen Alexandra ancillary healthcare

Dental practices, private clinics, GP and pharmacy freeholds inside the Queen Alexandra Hospital ancillary cluster.

£500K to £2M

Cosham High Street retail parade

Cosham district centre retail and F&B parade investment and owner-occupier freehold.

£300K to £1.2M

PO6 care home

Care home freehold inside the PO6 ward catchment serving the affluent NHS and MoD retiree base.

£1M to £4M

Refinance on Lakeside asset management capex

Lakeside North Harbour landlord refinance on completed refurbishment and re-letting.

£1.5M to £6M

Commercial mortgage products active in Cosham and Lakeside

Lakeside Grade B office investment routes via commercial investment mortgage on ICR. Owner-occupier professional firms buying their Lakeside floor via owner-occupier mortgage on EBITDA cover. Queen Alexandra ancillary healthcare via trading-business mortgage on NHS contract value plus EBITDA. Cosham High Street semi-commercial via semi-commercial mortgage. Vacant or repositioning Lakeside floors route through bridge-to-let. Refinancing maturing facilities through commercial remortgage is the highest-volume single product in 2026.

Owner-occupier

Businesses buying their trading premises, EBITDA cover at 1.3–1.5x, LTV to 75% on bricks.

Commercial investment

Let assets, ICR at 140–160% stressed, LTV typically 65–75%.

Semi-commercial

Shop+flat archetypes, blended ICR ~145%, LTVs to 75% via specialists.

Bridge-to-let

Vacant or value-add acquisitions with refurb / re-let exit onto term mortgage.

Refinancing

Maturing facilities, equity release on stabilised commercial assets, rate-driven switches.

Lender appetite for Lakeside North Harbour, Queen Alexandra and Cosham High Street

Deep across the Cosham corridor. Allica Bank runs an engaged South Coast book and routinely tops the shortlist on Lakeside owner-occupier office floors, Cosham High Street retail and Queen Alexandra ancillary healthcare freeholds at 6.5 to 8.0% pa at 70 to 75% LTV, with Allica's health desk taking dental and private clinic with NHS contract value plus EBITDA. HTB covers larger Lakeside Grade B office investment and the upper end of Cosham retail parade investment at 65 to 75% LTV. Shawbrook takes Lakeside Grade B office investment particularly where capex programmes feed into the underwrite and value-add bridge-to-let on Lakeside repositioning floors. Cambridge & Counties selectively covers Lakeside Grade B let investment at 65 to 70% LTV on stronger-covenant tenant mixes. YBS Commercial covers owner-occupier office at the tighter end of pricing for strong-covenant SME borrowers. Paragon takes portfolio investment combining Lakeside and Cosham retail exposure. Together covers value-end Cosham High Street semi-commercial and selected ancillary healthcare freeholds. Hampshire Trust Bank is locally headquartered in Hampshire and runs one of the most active Portsmouth books, particularly on Queen Alexandra ancillary healthcare and Lakeside owner-occupier office floors. Allica, HTB, Paragon, Together, YBS Commercial and Cambridge & Counties all take selected Cosham and Lakeside deals in the £500K to £5M bracket. Refinancing on a stabilised Lakeside Grade B office investment typically prices 7.0 to 8.5% pa at 60 to 70% LTV. Commercial mortgages are unregulated lending and fall outside the FCA regulated mortgage perimeter, we do not hold FCA authorisation because the products we arrange are unregulated.

Property types we finance in Cosham and Lakeside North Harbour

Asset classes most active in Cosham and Lakeside North Harbour, each linked to the dedicated finance structure, lender appetite and typical terms for that property type.

Cosham and Lakeside North Harbour sold-price data

Live HM Land Registry transaction data for the Cosham and Lakeside North Harbour local authority area. Use this as market evidence when appraising your scheme or testing GDV assumptions.

Median price

£255K

+2% YoY

Transactions (12m)

1,870

Completed sales

New-build share

0.0%

0 new-build sales

New-build premium

n/a

vs existing stock

Median price by property type

Detached

£538K

Semi-detached

£335K

Terraced

£260K

Flat / Apartment

£165K

Recent transactions

DatePostcodeAddressTypePrice
25 Feb 2026PO2 7HW2, DRAYTON ROADOther£322K
25 Feb 2026PO4 9JW44, FORDINGBRIDGE ROADTerraced£367K
20 Feb 2026PO6 1NB20, COPSEY GROVETerraced£218K
20 Feb 2026PO4 8AG100, FRENSHAM ROADTerraced£379K
20 Feb 2026PO4 9DZFLAT 1, MAUREEN FOYE COURT, HASLEMERE ROFlat / Apartment£190K
20 Feb 2026PO4 9HQ91, METHUEN ROADTerraced£263K
20 Feb 2026PO5 1NR86, OXFORD ROADTerraced£231K
20 Feb 2026PO2 8BE62, PITCROFT ROADTerraced£230K

Source: HM Land Registry Price Paid Data, Portsmouth LPA. Updated 27 Apr 2026.

Cosham and Lakeside North Harbour commercial mortgage FAQs

Up to 70% LTV on let Lakeside Grade B office stock. Allica Bank, HTB, Shawbrook and Cambridge & Counties all quote 60 to 70% LTV at 7.0 to 8.5% pa depending on covenant strength, lease length and the post-refurbishment income profile. The Lakeside reconfiguration consent (Ref 26/00098/FUL) supports the underwriting on refurbished multi-tenant Grade B floors. Stamp duty applies at the commercial rates on the freehold purchase.
Yes. Hampshire Trust Bank is locally headquartered in Hampshire and runs one of the most active Portsmouth ancillary healthcare books, with Allica Bank's health desk also meaningful. Quote 70 to 80% LTV on the bricks plus NHS UDA contract value at 6.5 to 8.0% pa. The Queen Alexandra Hospital ancillary healthcare consent (Ref 25/01875/FUL) is the canonical PO6 healthcare ancillary profile.
Currently 7.0 to 8.5% pa at 65 to 75% LTV. Allica Bank, HTB and Shawbrook all compete actively on Cosham High Street parade stock, with the recent Cosham retail parade refurbishment (Ref 25/02012/FUL) lifting comparables across the district centre. Owner-occupier independents buying their own parade unit price tighter at 6.5 to 8.0% pa through Allica Bank and Hampshire Trust Bank.
Professional firms and SME headquarters buying a 3,000 to 10,000 sq ft Lakeside Grade B office floor route through owner-occupier commercial mortgage at 70 to 75% LTV at 6.5 to 8.0% pa through Allica Bank, HTB and YBS Commercial. EBITDA cover 1.3 to 1.5x. The Lakeside reconfiguration consent (Ref 26/00098/FUL) brings new floors to market as refurbishment completes, expanding available owner-occupier stock.

Buying or refinancing in Cosham and Lakeside North Harbour?

Free-of-charge deal assessment. Indicative commercial mortgage terms within 48 hours.