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Knowledge Hub - Cost engine

SIP Garden Room Cost Engine

A calm, realistic way to estimate what a proper SIP garden room is likely to cost - with clear assumptions and a breakdown you can send to me or compare against other quotes.

This is a guide, not a final quote. It's based on typical Helps & Co specifications in Surrey & Hampshire. Site conditions, access and extras will always affect the final number.

Want context alongside the numbers? Read the Surrey garden room guide (2026) for planning and foundations info. Want to understand how we calculate costs? View our Surrey pricing guide.

1. Tell me roughly what you're thinking

Keep it simple - this doesn't need to be perfect. It's just to get into the right ballpark.

Left-to-right when looking at the front elevation.
Front to back into the garden.
This mainly affects finishes, glazing and time spent on detailing - not cutting corners on structure.
This doesn't include running services from the house - that's always priced on a site visit.
Bespoke flexibility

Got something more custom in mind?

Many premium garden rooms include bespoke glazing layouts, roof details, or site-specific considerations. Your estimate remains a reliable guide - we simply fine-tune and confirm a fixed price on a site visit.

No obligation - No email required - Realistic guide pricing
2. Guide build cost (supply & install)
Approx. -
Based on - and a - SIP specification.

This is a guide only. Groundworks, access, service runs from the house, complex glazing, plumbing and bespoke joinery are always confirmed after a site visit. I'd rather be accurate than guess.