“Non-standard construction” can sound like a verdict on a property. Buyers hear it and worry that the home is defective, unmortgageable or something they should avoid.

But the term covers an enormous range of buildings, from modern timber-framed homes to post-war concrete houses and centuries-old cottages built with traditional materials.

The useful question is what the property is actually made from, how it has been constructed and what that means for the lender being asked to finance it.

One description can hide very different properties

Telling a lender that a house is “timber framed” or “concrete built” may begin the conversation, but it rarely provides enough information to reach a reliable decision.

Construction systems vary considerably. Their age, design, condition and history can all affect how a lender approaches them.

A modern timber-framed house built under a recognised warranty may be widely acceptable. An older property using a less familiar system may need much closer investigation.

Two homes that look similar in the sales particulars can therefore have very different mortgage options. Equally, a property that looks unconventional may be more straightforward to finance than its appearance suggests.

Condition and mortgageability are different questions

A property can be well maintained and structurally sound but still fall outside a particular lender’s criteria.

The lender is considering more than whether the building is safe today. It also needs to understand its likely lifespan, maintenance requirements, insurability and future resale market.

A structural engineer’s report can help answer important questions about the building. It does not automatically resolve every lending concern or require a lender to accept a construction type excluded by its policy.

This is why commissioning additional reports before establishing what a prospective lender needs can lead to unnecessary expense.

The evidence should address the questions that will actually determine the lending decision.

Repairs need a clear paper trail

Some properties have a history that matters as much as their current condition.

Certain post-war concrete construction systems were formally designated defective. Where a property has subsequently been repaired, the lender may need evidence that the work followed an acceptable scheme and covered everything required.

A description such as “fully renovated” does not establish this. New kitchens, windows and finishes tell us very little about the underlying structure.

The relevant repair certificate, details of the work and any implications for adjoining properties or later extensions can be much more important.

The distinction is between a home that appears to have been improved and one whose structural history can be properly evidenced.

The lender is also thinking about the next buyer

Buyers naturally focus on whether a property works for them. Lenders also consider who might buy it in the future.

If relatively few mortgage providers accept the construction type, the pool of potential purchasers may be smaller. That can affect marketability even where the home is attractive and in good condition.

Comparable sales of similarly constructed properties can help demonstrate an established market. Suitable buildings insurance is another important part of the picture.

Some lenders may respond by limiting the proportion of the property’s value they will lend. Others may be comfortable with the construction but require further evidence before proceeding.

A larger deposit may help in some circumstances, but it will not necessarily overcome a lender’s restriction on a particular construction system.

Planned alterations can change the assessment

A buyer may intend to extend, remodel or substantially alter the property after purchase.

With some construction systems, removing walls, cutting openings or changing external panels can have implications that are not obvious from a floorplan. An existing extension may also introduce a different construction method or raise questions about how the structures connect.

Where alterations are central to the purchase, they should form part of the early discussion.

The property as it stands and the property the buyer intends to create may require different considerations, including specialist structural advice and the lender’s consent to proposed works.

Identify the construction before choosing the mortgage

The most useful early work often happens before an application is submitted.

Establishing the precise construction system, gathering existing reports and certificates, and understanding any repairs or proposed changes allows the property to be presented accurately to prospective lenders.

This is where an experienced mortgage adviser can make a practical difference: identifying lenders familiar with the construction and distinguishing between a firm policy restriction and a concern that further evidence might resolve.

It can also help avoid paying for valuations or reports before there is a realistic lending route.

A decline from one lender does not necessarily mean the property is unmortgageable. But finding an alternative starts with understanding why it was declined.

“Non-standard” is a broad label. The mortgage decision depends on the detail behind it.