The society returned to the lending market in August and relaunched its Right to Buy and shared ownership mortgages last week.

It is gradually adding new products in specific niche areas where it has noticed a steady demand.

The self-build mortgages, Dudley said, were a ‘well thought out’ and ‘well-priced’ proposition in an area of the market which is growing.

Sam Ward, commercial director at Dudley said: “It is very exciting to see these products emerging.”

She added: “We are particularly pleased to have been able to build in an advance drawdown option to our self-build products as well as offering our eco build option at a special preferential rate.

“With one in seven people desiring to build their own home, we are confident that demand for self-build funding can only increase and we are delighted to be able to offer our introducers this facility for their customers.”

The new products are discounted from the society’s SVR for the term of the mortgage.  Rates vary depending on whether stage payments are taken in advance, if the applicant requires funding before each stage begins (4.74%) or can fund each stage before drawing down the stage payment in arrears (4.49%).

There is also a preferentially priced product with a deeper discount aimed at those applicants who are aiming to build an Eco Build property.

Dudley is offering both advance and arrears eco products at 4.34% and 4.09% respectively, based on a discount for term from the Society’s SVR.

The mortgages have LTVs up to 75% at end valuation, overpayments of 10% are allowable without penalty in the first two years an there’s an ERC of 3% of the current balance for the first two years plus a maximum term of up to 35 years.