Both societies made rate reductions to 90% LTV mortgages.
Newcastle Building Society has made rate reductions.
The society has reduced the rate of its 10-year fix at 90% LTV by 0.04% to reach 2.85%.
It comes with a £999 fee, of which £800 can be added to the mortgage advance.
Rachel Springall, finance expert at Moneyfacts, said: “Now priced at 2.85%, the deal is available to borrowers with a 10% deposit and while no incentives are offered, £800 of the product fee can be added to the mortgage advance so those looking to secure a competitive fixed rate over the next decade may still find it attractive.
“As a result, the deal earns a Moneyfacts product rating of Excellent.”
Yorkshire Building Society has increased the rate on its 2-year fix at 90% loan-to-value (LTV) by 0.07% to reach a rate of 1.91%. It comes with a free valuation and £495 which can be added to the mortgage advance.
Spingall added: “Borrowers who have the required 10% deposit and are searching for a trusted brand for their mortgage will find this deal appealing. As a result, the deal earns a Moneyfacts product rating of Outstanding.”