Comparable evidence, defensible by design.
Pull RICS-grade comparables, EPC and fabric data, environmental indicators (coal area, mining area, area-level crime), and tenure intelligence for any UK address — with the evidence trail attached. Propalt gives surveyors and surveyor platforms the data layer behind faster reports and tighter PII defence.
The Problem We Solve
A residential mortgage valuation is a 24-hour SLA with PII consequences if the number is wrong. Yet the average surveyor still pulls comparables by hand — Rightmove tab, Land Registry tab, EPC Register tab, Companies House for the limited-company owners — losing 40 minutes per case before the report is even started. Stale comps slip in. Environmental indicators get missed. The PII insurer notices years later.
The Propalt API gives surveyors and surveyor platforms RICS-grade comparable evidence with full audit trail, EPC ratings and fabric data, environmental indicators (coal area, mining area, area-level crime), lease and tenure intelligence, planning history, and owner-type classification — in one call, timestamped, defensibly logged. Sign the report knowing the evidence is there if you ever need it.
What You Can Build
Six common patterns built on Propalt by surveying firms and surveyor-facing platform engineering teams today.
RICS-grade comparable pulls
Return 6–15 comparable sales filtered by property type, bedrooms, radius, and recency — backed by get-sold-properties for raw transaction evidence and get-price-distribution for postcode-level confidence bands. Each comparable includes sold price, date, EPC, tenure, and a direct link to Land Registry evidence.
Audit-defensible evidence packs
Every comparable, every valuation, every environmental indicator returns with a timestamped evidence pack — PDF or JSON — built for RICS Red Book audit and PII defence.
One-call environmental indicators
Coal-mining authority area, mining-area flag, and area-level crime context — surfaced for any UK address. Reduces £20–50 of individual environmental reports per case to a single API call.
AVM-assisted desktop valuations
Generate a first-pass AVM with confidence band and comparable evidence — for the surveyor to confirm, adjust, or override. Faster Level 1 reports without losing the surveyor's sign-off.
Planning and consent history
Pull planning applications, building control sign-offs, and extensions detected on the subject property — automatically.
Leasehold and tenure intelligence
Surface lease length remaining, ground rent escalation, service charge indicators, and corporate ownership patterns for any leasehold property.
Key Endpoints for Surveyors
These 10 endpoints cover > 90% of surveyor workloads. Browse the full 36-endpoint directory for everything else.
Example API Response
A full valuation data pull — subject property, 14 comparables, environmental indicators, and tenure intelligence in one call, with evidence pack attached.
{ "property_id": "prop_9d4f17", "uprn": "100023456789", "address": "27 Mowbray Road, Manchester M14 5BS", "tenure": "Leasehold", "lease_years_remaining": 87, "ground_rent_pa": 250, "ground_rent_review_pattern": "doubling_25yr", "property_type": "Semi-detached", "bedrooms": 3, "floor_area_sqm": 89, "epc": { "rating": "C", "score": 71, "expires": "2029-11-08", "fabric": { "walls": "cavity_filled", "roof": "pitched_insulated_200mm", "windows": "double_glazed_post_2002", "main_heat": "gas_combi" } }, "comparables": { "count": 14, "radius_m": 400, "window_months": 12, "median_sold_price": 298000, "iqr": [276000, 318000], "matched_filters": ["bedrooms", "property_type", "tenure"], "evidence_pack_url": "https://api.propalt.io/evidence/ev_4f8a2c" }, "environmental": { "coal_authority_area": "false", "mining_area": "false", "area_crime_band": "below_national_avg" // flood_zone / radon_affected_area / ground_stability // not yet in the catalog — flagged for product roadmap. }, "planning_history": { "applications_5yr": 1, "consented_extensions_detected": 1, "outstanding_enforcement": "false" }, "evidence_pack": { "pack_id": "ev_4f8a2c", "generated_at": "2026-05-27T11:14:08Z", "format": ["json", "pdf"], "rics_red_book_aligned": "true" } }
Every comparable. Every check. Evidence attached. One API.
Free tier · 500 credits / month · No credit card.