I would ring a garage door in the first instance that would probably be cheapest.
I see nor reason why the existing beam could not be lowered with some carful calculations
The concept would be to bolt on to the web of the existing beam two steel angles to each side that
Are 50mm above the e jting bottom flange. This is a shear connection so you would expect to end up with m16 bolts at 150mm centres. You may need to weld extra plates to the bottom each flange to give sufficient strength
You will need to epoxy glue the, and torque the bolts up to as4100.
Once the angles are on you.could plasma cut and grind the web off the rsj and lower to ground.
You will need a mobile scaffold, building permit engineers comps, hire of some lifting gear
It looks like a steel erectors job not a builders job to me.
It is do able but will be several days work for 2 or 3 men.
You will avoid needle and props to prop your house while replacing a beam unsettling your brickwork heavy cranes.
Clive


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with the savings from not modding the house get a ARB double pump comp and a rattle gun to change the tyres quicker in the driveway, and maybe a x-brake. You could for your trip tyres look at either original size, 255/85(33.3in) or 315/75 with either standard rims for first 2 ( zero offset is better for 255's) or a -25mm for 315's.
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