I’m stressing - I have a large corner sofa being delivered and it definitely won’t fit through the front door but I have patio doors to the rear which open into the living room. The sofa will have to come through the garden gate though and the width of this is less than the height of the sofa. There are no awkward angles and no height restriction of the gate but what if it can’t fit through?
It took 4 strong men (and me helping a bit) to lift my dining table over the fence to come in via the patio doors. So even if this was the only way in, it's very unlikely a delivery firm would have enough manpower with them to do it (and they wouldn't anyway for fear of damaging fence, injury to staff etc.)