--- title: "Non standard construction mortgage Scotland" description: "When investing in the Scottish buy to let market, landlords encounter a wide range of construction types, from stone tenements and granite to timber frame, steel frame, PRC and cob. Lenders assess construction method as a core risk factor as it directly affects durability, insurability, long-term maintenance and resale value. Understanding how Scottish lenders view different build types shows which of them may consider a property before you apply for mortgage approval." url: "https://mortgagelane.com/guides/buy-to-let-mortgage-scotland/non-standard-construction-mortgage-scotland" site: "Mortgage Lane" collection: "guides" date: "2026-03-30" author: "Seren Norton" category: "Mortgage guide" reviewed: "2026-10-01" reading_time: "4 min" byline: "Seren Norton" author_credentials: "CeMAP · FCA authorised firm" language: "en-GB" robots: "index,follow" --- # Non standard construction mortgage Scotland When investing in the Scottish buy to let market, landlords encounter a wide range of construction types, from stone tenements and granite to timber frame, steel frame, PRC and cob. Lenders assess construction method as a core risk factor as it directly affects durability, insurability, long-term maintenance and resale value. Understanding how Scottish lenders view different build types shows which of them may consider a property before you apply for mortgage approval. When investing in the Scottish buy to let market, landlords encounter a wide range of construction types, from stone tenements and granite to timber frame, steel frame, PRC and cob. Lenders assess construction method as a core risk factor as it directly affects durability, insurability, long-term maintenance and resale value. Understanding how Scottish lenders view different build types shows which of them may consider a property before you apply for mortgage approval. [Non-standard construction](https://mortgagelane.com/definitions?term=non-standard-construction) Valuation A way of building a home that a lender does not class as standard under its own property criteria. Each lender keeps its own list, so the same home can be standard at one lender and non-standard at another. [Read the full definition of Non-standard construction](https://mortgagelane.com/definitions?term=non-standard-construction) Back to overview [Buy to Let Mortgage Scotland](https://mortgagelane.com/insights/buy-to-let-mortgage-scotland) Related definitions [Mortgage](https://mortgagelane.com/definitions#def-mortgage) · [Buy-to-let mortgage](https://mortgagelane.com/definitions#def-buy-to-let-mortgage) ## Non standard construction mortgage Scotland ### Non-standard construction mortgages in Scotland (buy to let) When investing in the Scottish [buy to let](https://mortgagelane.com/definitions#def-buy-to-let-mortgage) market, landlords encounter a wide range of construction types, from stone tenements and granite to timber frame, steel frame, PRC and cob. Lenders assess construction method as a core risk factor as it directly affects durability, insurability, long-term maintenance and resale value. Understanding how Scottish lenders view different build types shows which of them may consider a property before you apply for mortgage approval. ### Standard brick and masonry construction Traditional masonry construction, brick or stone, is standard construction for mainstream lenders: Coventry Building Society's published residential criteria, for example, start from brick or stone walls with a tile or slate roof. In Scotland this includes the Victorian and Georgian tenements of cities such as Edinburgh and Glasgow. These properties are generally straightforward to mortgage, subject to condition, title clarity and the [valuation](https://mortgagelane.com/definitions#def-mortgage-valuation). ### Timber frame construction Timber-framed properties are found in many parts of Scotland, including rural areas and modern developments. Many lenders treat modern timber frame with a masonry outer wall as standard construction, while others apply tighter criteria based on the build year and the outer walls, and all-timber or timber-clad homes are often declined. Buy to let approval depends on the external wall finish, the build year and evidence of long-term durability. ### Steel frame construction Steel-framed homes range from post-war systems such as [BISF](https://mortgagelane.com/definitions#def-bisf-house) to modern steel frame with a masonry outer skin. Lenders assess the system and build year, corrosion risk, fire resistance and the building's warranty or certification: some ask for a BBA or WIMLAS certificate or a structural engineer's report depending on when the home was built. A newer steel frame system manufactured offsite counts among the [modern methods of construction](https://mortgagelane.com/definitions#def-modern-methods-of-construction), for which some lenders ask for BOPAS accreditation and a warranty. Buy to let lending is available from some lenders on those terms, while others decline steel frame altogether; SBI UK's buy to let criteria, for example, list steel framed and clad properties as unacceptable (checked 29 September 2026). ### Precast reinforced concrete (PRC) [PRC](https://mortgagelane.com/definitions#def-prefabricated-reinforced-concrete) properties, largely built in the post-war period, are treated as non-standard construction by lenders. Mortgage availability depends on the specific PRC type, whether the property has been repaired under an approved scheme, and confirmation from the valuer that it is mortgageable. Some mainstream buy to let lenders consider repaired PRC with evidence of the repair, while many decline unrepaired PRC. The statutory [defective designation](https://mortgagelane.com/definitions#def-designated-defective-housing) regime was repealed in Scotland in 2018, so lenders apply their own construction rules. ### Stone construction Stone-built properties are found throughout Scotland. Stone construction is widely accepted: lenders whose standard construction includes stone walls with a tile or slate roof accept it on normal terms, and the valuer focuses on wall thickness, pointing condition, damp risk and roof integrity. The valuation reflects the property's condition as well as comparable sales. ### Granite construction Granite is a building stone, so granite properties, including many in Aberdeen, are stone construction, which lenders generally accept. Lenders and valuers still consider maintenance costs, weathering and repair history when assessing long-term suitability for buy to let lending. ### Cob and other natural construction methods Cob and earth-built properties are found in Scotland, and lender attitudes vary: some mainstream lenders treat cob as traditional construction, while others decline it. Lenders put strong emphasis on condition, insurability and market demand. For non-standard construction buy to let properties in Scotland, lender choice turns on valuation confidence, insurability and future saleability as well as on the borrower profile. Each lender's rules for the construction and for Scottish property are checked before applying, particularly for rural, historic or specialist property types. See [non-standard construction mortgages](https://mortgagelane.com/mortgages/non-standard-construction-mortgages) for named lender examples. [Get in touch](https://mortgagelane.com/contact) ## Talk it through with an adviser Speak to a Mortgage Lane adviser about your circumstances and the next steps. Published: 2026-03-30 Last reviewed: 2026-10-01 Source: https://mortgagelane.com/guides/buy-to-let-mortgage-scotland/non-standard-construction-mortgage-scotland