Since they have moved into the property the odds of the couple announcing a baby next year have risen.
Betway claim the royal couple are 2/1 to be expecting in 2020 following the £2.4 million Frogmore Cottage renovation.
The Duchess of Sussex is now just 2/1 with Betway to fall pregnant with her and Prince Harry’s second baby as early as next year.
The latest rumours of an extension to the home of the family-of-three comes as royal accounts have revealed a significant multi-million pound renovation to their Windsor residence.
The online bookmaker offers 10/1 for Meghan and Harry to announce they are expecting a little brother or sister for their son Archie before the end of 2019.
It’s 6/4 for the Duke & Duchess of Sussex to hold off for number two until 2021.
Betway’s Alan Alger said: “Once Harry and Meghan have settled down after the arrival of Archie in early May, everyone will be guessing as to whether and when the next one will be on its way.
“Significant renovations suggest that Frogmore Cottage is going to be the Duke and Duchess of Sussex’s residence for a long time to come and we make it just 2/1 that they fill another room with their second baby by the end of next year.”
Odds of Duke and Duchess of Sussex to announce second baby in:
2019 – 10/1
2020 – 2/1
2021 – 6/4
How much Harry and Meghan’s renovations cost compared to Kate and William’s?
Frogmore Cottage, the cost of which is estimated to reach £3 million, had been split into five residences, however, the huge house has been turned back into one large home for the Duke and Duchess of Sussex.
New beams and floor joists were put in, as were entirely new gas and water mains installed.
The home also has all new bathrooms and a brand new kitchen with a “floating” floor.
There is new eco-heating, likely in line with Meghan’s eco-friendly ethics. Soundproof windows are said to have set the couple back £350,000.
In comparison Kate Middleton and Prince William’s Anmer Hall renovation cost £1.5 million.
The Anmer Hall renovations were extensive but cost half of what Frogmore Cottage is said to have cost.
The roof was replaced, which is said to have cost £500,000. Old rotted window frames were replaced with new windows at £100,000.
A garden room for the family to enjoy was added on to the property, at a cost of £250,000 and £300,000.
Who is Meghan Markle? Quick profile
Meghan Markle was born Rachel Meghan Markle, on August 4, 1981 to parents Doria Ragland and father Thomas Markle.
Her father was previously married to Roslyn Loveless and Meghan has two elder half sibling – sister Samantha Markle and brother Thomas Markle Junior.
Meghan’s first television appearance in the USA was in an episode of the medical drama General Hospital in 2002.
She later moved on to roles in CSI, Without a Trace and Castle along with bit parts in Hollywood films including Get Him to the Greek, Remember Me and Horrible Bosses.
Meghan was also a “briefcase girl” on Deal or No Deal – but her most famous role was as Rachel Zane in legal drama Suits, which launched in 2011.
She was written out in the finale of the seventh series when her character got married, which aired in April 2018 – just before she got married herself.
Charity and humanitarian work
Meghan Markle’s career in television has gone hand-in-hand with her support for causes close to her heart.
She wrote about the stigma around menstrual health in an article for Time magazine and was a Global Ambassador for World Vision Canada – with whom she travelled to Rwanda for the charity’s Clean Water Campaign.
And her commitment to gender equality has seen her work with the United Nations – receiving a standing ovation in 2015 for her speech to mark International Women’s Day.
In September 2011, she wed film producer Trevor Engelson, who she began dating in 2004.
But the pair divorced two years later in August 2013, citing irreconcilable difference.
She was in a relationship with celebrity chef Cory Vitiello for almost two years, before they broke it off in 2016 but the two remain good friends.
And in June 2016, she met Prince Harry on a blind date set up by a mutual friend.
Their relationship began in October that year and just over one year later, on November 27, 2017, the pair announced their engagement.
They married on May 19, 2018 at St George’s Chapel in Windsor Castle.
Some have claimed Meghan Markle is the first mixed-race member of the Royal Family.
Historians are still arguing about Queen Charlotte, the wife of King George III.
But Meghan will be the first royal to openly embrace a mixed-race heritage.
She has written about the difficulties of being a biracial actress in Hollywood as she claims she is not black enough for some roles and not white enough for others.