Planning & Professional Fees

Architectural Design: £1,000–£3,000+ (or ~15% of project)
Planning Applications: £250–£450
Structural Engineer Reports: £500–£1,500
Building Regulations & Inspections: £500–£1,000
Party Wall Agreements (if applicable): £800–£2,000+

Windows, Doors, Skylights & Lanterns

Standard Windows: £1,000 per opening
Bi-fold Doors: £1,500–£4,500+
Skylights: £1,000–£1,500
Roof Lanterns: £1,500–£3,000+

Internal Finishes

Plastering & Decorating: £20–£50/sqm
Flooring (wood, tiles, etc.): £45–£100+/sqm
Internal Doors, Skirting & Trim: Variable by spec

Kitchen, Utility Room & Bathroom Fit-Out

Kitchen Installation: £10,000–£25,000+
Utility Room Fit-Out: £3,000–£7,000
Bathroom/WC: £5,000–£12,000
Appliances & Worktops: Based on choice
Painting & Finishing: £2,000–£3,500

Electrics & Plumbing

Electrics: £3,000–£5,000+ (or ~£80–£90/point)
Plumbing Installations: £3,000–£5,000+
Lighting Fixtures & Smart Systems: Varies by project

External Works & Landscaping

Patios, Paths, & Garden Areas: £2,000–£10,000+
Driveways, Drainage & Fencing: Cost based on site
Roofing Tie-Ins or Guttering Changes: If applicable

Utility Upgrades & Optional Extras

Mains Supply Upgrades (Gas/Water/Electric)
Drainage or Sewer Adjustments
Smart Home, AV, or Network Systems

GET IN TOUCH

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