Due to the many styles of garments and various methods of contruction used in clothing manufacture prices do vary.  I can only give an accurate quote on viewing it.  However here are the most popular alteration requests and a price guide...

PRICE GUIDE
Shortening Trousers
Top stitched £6.50
With blind hem £7.00
Jeans with matching thread £8.00
Jeans with original finish hem £10.00
With turn ups £8.50
With kick-tape £11.00
Lengthening using existing hem or tape £7.50
Taking in Trousers
With waistband £10.00
With facing £8.50
Tapering hips and legs £8.50
Take in/let out waist & seat on mens suit trousers £7.50
Shortening Skirts & Dresses
Unlined & non flared £7.00
Unlined & flared £9.50
Lined & non flared £9.50
Lined & flared £15.00
Very fine fabrics e.g. chiffon, silk or with vents Extra fee
Jersey, stretch fabrics that need coverstiching (stitching that stretches) Extra fee
With vent +£2.00
Taking in skirts- prices vary depending on linings, position of zips & elastic etc £8.00-£10.00
Jackets,Coats & Shirts
Unlined sleeves shortened £7.00
Lined sleeves shortened £11.50
Sleeves lengthened £8.00-£12.00
Sleeves shortened/lengthened with cuffs +£5.00
Lined jacket/coat with vent shortened £20.00-£25.00
Unlined jacket/coat shortened with vent shortened £10.00-£15.00
Lined jacket/coat shortened £16.50
Jersey T-shirt shortened £8.00
Replacing Zips (including zip)
Jeans £10.00
Trousers £8.50
Skirt £8.50
Dress £10.50
Concealed zip in dress £12.50
Jacket or coat £15.00-£20.00
Overalls £10.00-12.00
Curtain Alterations Per 30cm width
Unlined £1.10
Lined £1.60
Velvet £2.00
Lined & velvet £1.75
With eyelet or hand pleated headings £2.00
Net curtaining £1.00
EXPRESS ALTERATIONS
WITHIN 24 HOURS +20% extra fee
COMPLETED WITHIN SAME DAY +50% extra fee